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Troubleshooting - Heavy Haulers RV Resource Guide

1. W3003016 1 Door speaker all models both 5 Subwoofer VN 770 sides 6 Rear speaker VNL 420 both sides 2 Dash speaker all models both 7 Rear speaker VNL 610 both sides sides 3 Rear speaker VN 660 770 both Note Rear speakers in the day cab sides vehicles have the same location as in A Rear speaker VN 770 both sides the VNL 420 7 33 Group 39 Delco Audio System Troubleshooting Antenna The antenna collects radio frequency signals Electro magnetic energy radio waves from a broadcast antenna induces a very small voltage in the receiving antenna For best performance the receiving antenna would be sized to receive the wavelength being broadcast This is impractical as vehicle radio systems tune in a wide range of frequencies with wavelengths between roughly 3 meters FM and 566 meters AM 10 ft and 1856 ft A vehicle antenna is a compromise of utility over perfor mance with the receiver carrying the additional burden The vehicle antenna system consists of not only the mast but also the ground plane The antenna cable shield must be properly grounded at the antenna base Without proper grounding the signal can be weak or even eliminated Improper grounding can also make the antenna susceptible to noise Antenna Types Three types of antennas are currently used on th
2. 1 2 24 4 Nm 18 3 ft lb I 8 Nm 7 in lb It 4 I 0 8 45 7 Antenna Lead in Cable Fixed Mast Type Sleeper Cab Re placement The fixed mast antenna is standard on the VNL 420 sleeper cab vehicles For the VNL and VNM day cab vehicles see Antenna Lead In Cable Fixed Mast Type Day Cab Replace ment page 92 The lead in cable is attached permanently to the an tenna base The VNL 420 may also be equipped with optional multiplexer antenna system Determine which antenna system is used before beginning repairs Removal 1 Remove the front left overhead storage cabinet together with the sun visor 2 Remove the right sun visor 3 If equipped remove the front right overhead storage cabinet Note Two screw covers on the far right facing panel must be removed to gain access to the mounting screws 4 Remove the front overhead storage cabinet carrier rail 99 Group 39 Delco Audio System Troubleshooting Antenna Lead ln Cable Fixed Mast Type Sleeper Cab Replacement 5 8 Remove the driver side window visor assembly Pry off end screw covers Remove mounting screws 6 Remove the sleeper curtain rail as sembly Note The curtains do not need to be removed from the rail 3003095 Curtain rail or trim washer Plastic spacer Cab metal Headliner Screw E Check the retaining clips
3. Note Do not hold the antenna mast by hand This will decrease the capability of the antenna to receive a station Test Antenna Construction A test antenna can be constructed from any old antenna lead in assembly Volvo antenna P N 1586621 and lead in base assembly P N 1082185 make an excellent test antenna due to convenient size of the antenna and a long lead in cable 2 W3003386 Fabricate a sheet metal plate per the drawing above Mount the plate on a 150 x 100 x 50 mm 6 x 4 x 2 in piece of wood Install the ground wire attach an alligator clip in the other end of the ground wire Install the antenna assembly 75 mm 3 in 100 mm 4 in Mounting holes 6 25 mm 1 4 in Ground wire hole 6 25 mm 1 4 in W3003385 Antenna hole 18 75 mm 3 4 in 71 Group 39 Delco Audio System Troubleshooting Troubleshooting Diagnostic Test Kit Test CD Cassette Tape The Delco Audio Diagnostic Kit Kent Moore J39916 A can be used to diagnose several audio complaints The test CD cassette tape will provide the technician with test tones for the following test Note An instruction booklet is included with the kit Function Bass subwoofer test Mid range speaker tests Door tweeter test All speaker test Speaker buzz and rattle test Noise diagnosis Coaxial speaker diagnosis Motor speed test Improper use of this diagnostic CD cassette tape can result in speaker or amplifier damage Always b
4. are windings of wire a DC circuit this looks like a short but to an AC cir cuit this looks like a high resistance Thus AC is effectively blocked while DC passes normally 67 Group 39 Delco Audio System Troubleshooting Troubleshooting Filters CY VY A gt AC L DC T W3003069 Inductors are often used with a capacitor to form a filter Each end of the inductor L is connected in series to the DC circuit and the remaining end of the capacitor C to ground This forms a double tap for AC that may be traveling the DC circuit The capacitor will short some AC to ground while the inductor will block any remaining AC Filter packages can be especially useful in suppressing noise caused by a constant AC interference Such interference can be caused by an electric motor 1 2 3 4 5 W3003067 Component battery or ignition feed Capacitor ground lead Try grounded and ungrounded Filter P N 176011 Splices Noisy electrical component Filter performance is polarity sensitive Therefore the effectiveness of the filter is dependent on whether the AC reaches the inductor or the capacitor first The filter 2 is designed to be most effective when the end with the capaci tor ground is connected toward the source of electrical noise Install the filter in this polarity first If the noise level is still not satisfactory try disconnecting the capacitor ground In some cases if the first two conn
5. f 1 Lower edge of dash 2 Nut at the radio mounting bracket Install the nut on rear of the radio mounting bracket Access the nut from under the dash Torque to 1 4 0 2 Nm 12 4 1 8 0 9 Install the right side right door HVAC duct Heads ZS BTA T ee Za LS x BES 23277 E EE BE W3000675 1 4 0 2 Nm 12 4 1 8 in Ib Antenna Lead In Cable Fixed Mast Type Sleeper Cab Replacement W8001180 Install the right upper dash with 3 mounting screws and 1 mounting bolt in the speaker well 11 W8001178 Connect the wiring connector and in stall the right dash speaker and the grill 105 Group 39 Delco Audio System Troubleshooting Antenna Lead ln Cable Fixed Mast Type Sleeper Cab Replacement Pull the right side floor mat back and insert the lower right dash panel onto the weld studs Install the 7 torx screws in the top of the panel Pull the mat back at the accelerator pedal and insert the lower center dash panel onto the weld studs Install the 4 torx screws in the top of the panel Torque to 3 5 0 5 Nm 31 4 5 in lb 13 W8001166 Pull the floor mat back and install the plastic nuts in the lower right dash panel and the panel under the center of the dash 106 14 3 4 W3003110 1 Roof plate 2 Roof panel Headlining 4 Fully engage fasteners pressing firmly Note the location of all interlocking fastene
6. 14 W3003096 Pull out the antenna lead in cable at the antenna base connector Drill out the rivet or screw attaching the an tenna base bracket to the cab 15 Pull back one side of each piece of vinyl tape securing the antenna mast Gently pull down the rear headliner as necessary to complete the removal of the antenna mast Remove the an tenna from the vehicle 88 Antenna Mast Ribbon Type Replacement Installation 1 Check the antenna base mounting hole Clean if necessary Rivet or screw the new antenna base to the cab Use a steel 3 16 rivet W3003270 Check the continuity using the multi J39200 meter J39200 between the antenna base and the cab The antenna must be properly grounded to operate cor rectly The readings should be less than 0 2 ohms Note Zero the meter to avoid a false reading 3 Use vinyl tape to secure the antenna to the roof Gently pull down the rear headliner as necessary to complete the installation of the antenna mast 4 Connect the antenna lead in cable to the antenna base connector Turn on the radio to check antenna reception Group 39 Delco Audio System Troubleshooting Antenna Mast Ribbon Type Replacement W3003095 1 Curtain rail or trim washer 2 Plastic spacer 3 metal 4 Headliner 5 Screw W3003110 1 Roof plate Line up the mounting screws for the 3 0 5 Nm 2 Roof panel front
7. Dead Check all cable connections between the stereo and the CD changer The CD changer receives power through the radio fuse When this fuse is blown a loss of function for the CD changer and the radio will occur Refer to the fuse chart provided on the fuse panel Replace this fuse if necessary Set the ignition key in the OFF position Back probe the CD changer connector with a multimeter Kent Moore J39200 at the following measuring points Measuring points Expected value Pin 5 Alternate ground B Pin 7 Alternate ground less than 12 If the above conditions are not correct check the CD changer harness stereo receiver outputs and dam age incorrect truck wiring Refer to the appropriate wiring schematic If the above conditions are correct replace the CD changer 5See Harness Connectors page 47 50 Group 39 Delco Audio System Troubleshooting Troubleshooting e Commands from the stereo receiver to the CD changer are communicated digitally over the Entertainment and Comfort Data Link E amp C Data To check the E amp C Data Link back probe the CD changer connector with a multimeter Kent Moore J39200 at the following measuring points Measuring points Expected value Pin 10 amp Pin 7 0 AC Volts AM FM radio on Pin 10 amp Pin 7 Variable AC Volts CD changer operation requested Note AC voltages should change each time a track change is requested at the st
8. When the speaker is at rest such as during minimum volume the voltage applied to each side of the speaker is 1 2 ignition system voltage This way the speaker cone can easily be driven in either direction in or out To do this the amplifier will raise the voltage on one side of the speaker and will lower it on the other side then quickly reverse this polarity to get the speaker cone moving in the opposite direction The sound produced by speakers may be different due to speaker construction mounting location and vehicle acoustics It is not practical for one speaker to reproduce the entire musical frequency range well The range may run from 30 Hz to over 16 000 Hz in just one musical program Therefore the frequency extremes are left to their own special speaker types Large speakers called woofers produce the low frequencies the best while smaller speakers called tweeters produce the high frequencies best Volvo utilizes several types of speakers all designed dif ferently in their vehicle sound systems If speakers are replaced always use OEM replacement parts to main tain sound balance and quality 32 Om P Design and Function W3002993 Magnet Frame basket Basket mounted connector Cone Dome Surround Gasket Spider Pole piece Voice coil Group 39 Delco Audio System Troubleshooting Design and Function Speaker Location 7 J
9. 85 Antenna Mast Ribbon Type Replacement 85 Antenna Mast Multiplexer Type Replacement 91 Antenna Lead In Cable Fixed Mast Type Day Cab Replacement 92 Antenna Lead In Cable Fixed Mast Type Sleeper Cab Replace MENE EEN 99 Antenna Lead In Cable Ribbon Type Replacement 109 Antenna Lead In Cable Multiplexer Type Replacement Antenna Lead ln Cable Multiplexer Type Repair 133 Feedback Foldout A Amplified 8 Speaker Subwoofer System Schematic Foldout B 6 Speaker System Schematic Foldout C 4 Speaker System Schematic Group 39 Delco Audio System Troubleshooting General Volvo VN Sound System The stereo systems in the Volvo VN series trucks have been selected and tuned for optimized performance All VN models are available with a variety of Delco Electron ics components including a basic AM FM stereo radio with weather band a basic AM FM cassette player with weather band and Delco Electronics Premium Systems with enhanced features and performance All VN models are also available with either basic or pre mium speaker packages The VN 770 premium speaker system includes an 8 channel amplifier and a subwoofer The VN 660 and VN 770 models are available with re mote CD changers Consult the Owner s Manual that is supplied with the vehicle for complete operation i
10. A 4 until correct minute appears Seconds will set to 00 when adjusting minutes Frequency If radio is turned on and time is being displayed press RCL 7 to display frequency Stereo The radio will automatically switch to stereo when tuned to an FM station broadcasting stereo and the stereo indicator light ST will be dis played Note FADe and BALance controls have a detent position at the center for a balance of front to rear and left to right Balance The left right stereo balance is adjusted by rotating the BAL 8 control in the corresponding direction from the detent position FADE Using the tab behind the BAL control ad just the FAD 9 control to the right to fade toward the rear speakers Adjust it to the left to fade toward the front speakers Treble Rotate TRE 10 control to the left to decrease treble rotate TRE control to the right to in crease treble 13 Group 39 Delco Audio System Troubleshooting 11 12 Bass Rotate BAS 11 control to the left to decrease bass rotate BAS control to the right to in crease bass Note Both controls for bass and treble have a de tent position at the center for a balance of treble and bass Tape Player Insert a tape into the door marked AUTO REVERSE 12 Insert the tape with the raised side to the right Note The arrow in the display window points in the of tape play Fast Forward To activate fast forward press
11. Design and Function W3003002 FM signals and light rays respond to atmosphere in similar manner The atmosphere bends them both so they will follow the curvature of the earth to a certain ex tent This is called refraction and it is similar to a lens which can bend light waves A good example of this is when you see a sunset The sunlight is visible with the sun well below the horizon FM signals characteristically have a shorter range than AM signals Factors which affect the line of sight include e Height of the broadcast antenna e Height of the receiving antenna e Terrain and buildings in the broadcast path Group 39 Delco Audio System Troubleshooting Signal Disruption Since the higher frequency signals behave more like light the signal may be reflected or there may be areas of shadow When a receiver has more than one signal due to reflection we call it multipath distortion When a receiver is located in a signal shadow we call it flutter Multipath This condition is caused by reflected signals The re flected signal must travel further than the direct signal so it takes longer to get to the antenna and it is weaker when it gets there The receiver then has two signals which are slightly out of time with each other The two signals tend to cancel each other out This condition is most common in built up areas which reflect the signals A multipath area is often only a few inches wide At home you can loca
12. application of noise suppression and devices is very important Connecting a noise suppression device in the wrong place or incorrectly can cause a condition to worsen circuits to become inoperative or incorrect operation Good Grounds While a good DC ground is often called for it is most important to realize just what makes a good ground in an audio system Diagnostic procedures will often call for testing for a good ground A good ground the audio system is one with the following qualities e As short as possible e Total resistance of 0 2 ohms or less e Large surface area e Isolated from electrically noisy devices One diagnostic procedure calls for installing a braided ground strap from the chassis of the radio to a good grounding point As important as it is to install the good ground it is equally important to delete the previous ground at the radio If two grounds were allowed to remain it is possible to set up what is called a ground loop This occurs when there are two paths for ground return but they are not at equal potentials When this happens one actually carries a current to the radio chassis and adds it to the normal radio current Braided Grounds W3003063 Braided ground strap e Braid 10 5 Volvo P N 176001 e Braid 19 Volvo P N 176002 e Braid 21 Volvo P N 176003 e Braid 8 5 Volvo P N 176004 The audio system has small AC currents flowing in such places as th
13. are made of plastic To avoid warping keep the discs in their cases and do not store them in direct sunlight Design and Function E TAE W3002998 Group 39 Delco Audio System Troubleshooting Design and Function CD Changer DISC COMPACT CD CHANGER Oise DIGITAL AUDIO w3002991 The VN 770 and the VN 660 equipped with a Premium Sound System may be equipped with a six disc CD changer capable of storing and playing up to 6 full size CD s All CD functions except ejecting of the magazine are controlled by stereo buttons While the CD changer is loading CDs the CD changer icon in the radio display will blink This process will take approximately one minute W3003006 27 Group 39 Delco Audio System Troubleshooting CD Changer Magazine Handling the CD Magazines Precautions for handling magazines e Do not put the magazine in a place where it will be exposed to high temperatures or direct sunlight e Do not disassemble the magazine or knock it against anything e Never insert anything other than compact discs e Do not attach a label or tape to a disc e The use of benzine thinner insecticide or other volatile chemicals may damage the magazine surface Inserting Discs Load the discs in the magazine Up to 6 discs can be loaded in the magazine The discs are numbered 1 to 6 from the bottom disc tray Loading and Removing the Magazine To Insert a Disc 1 Be
14. bezel for the front overhead roof storage pockets with the star fasteners 15 W8001428 Install the front curtain rail assembly Use caution not to deform the rail as sembly Position rail and snap into retaining clips 16 Install the sleeper curtain rail assem 5 bly Torque to 5 1 Nm 45 7 in lb 45 90 Antenna Mast Multiplexer Type Replacement 17 If removed install the sleeper left over head storage cabinet Connect the lamp wiring connector Tight the cabi nets mounting bolts and torque to 24 4 Nm 18 3 ft lb Install the lamp wiring cover screws 18 If removed install the sleeper right overhead storage cabinet Feed the 12 volt power outlet connector through the cabinet access hole Connect the lamp wiring connector Install the cabi net mounting bolts and torque to 24 4 Nm 18 3 ft lb Install the lamp wiring cover screws Connect the 12 volt power outlet connector 19 Install the driver side window visor as sembly Torque to 5 0 8 Nm 45 7 in lb Install the screw covers 20 If removed install the front right over head storage cabinet Install the 4 mounting screws with their rubber washer to the carrier rail Torque to 2 0 3 Nm 17 in lb Install the 2 screws over the wind shield Torque to 3 0 5 Nm 25 5 in Ib Install the mounting screw covers 24 4Nm 18 3 ft lb 24 4Nm 18 3 ft lb 2 0 3Nm 17 16 3
15. cable ties to aid in reinstallation The under the dash Torque to 1 4 0 2 Ib lead in cable should be freed up to the Nm 12 4 1 8 in Ib antenna base Disconnect the connec tor at the antenna base Remove the 7 antenna lead in cable f th hicle E E Install the right side right door HVAC duct Installation 1 8 Connect the replacement lead in cable to the antenna 2 Temporarily connect the lead in cable to the radio and check for proper re ception 3 Disconnect the lead in cable from the radio Install the antenna lead in cable along the same route as it was re moved Secure as necessary W8001180 4 Install the right upper dash with 3 mounting screws and 1 mounting bolt Connect the lead in cable to the radio j in the speaker well Turn on the radio and check for proper reception Start the vehicle and turn on all accessories Check for noise en try into radio If noise is present reroute the lead in cable away from electrically noisy components See Noise page 59 113 Group 39 Delco Audio System Troubleshooting W8001178 Connect the wiring connector and in stall the right dash speaker and the grill w8001131 3 5 0 5Nm 31 4 5 in lb Pull the right side floor mat back and insert the lower right dash panel onto the weld studs Install the 7 torx screws in the top of the panel Pull the mat back at the accelerator pedal and insert the lower center dash panel
16. cover on the right rear corner Then pull the cover toward the passenger side and back to clear the tabs on the front and left sides Remove the CB cable grommet and then the CB cable 3 Remove the right front grab handle s upper bolt cover from the A pillar trim Remove the bolt and pull the handle out of the trim 78 Group 39 Delco Audio System Troubleshooting W8001131 Remove the 7 torx screws from the lower right dash panel Remove the 4 screws from the center dash panel W8001165 Pull the floor mat back and remove the plastic nuts Remove the lower right and center dash panels W3002404 Remove the nut on the rear of the ra dio Premium Radio Replacement W3002355 Premium radio removal tools Volvo P N 3949548 left P N 3949549 right Insert the radio removal tools into the left and right sides of the face of the radio until the tools lock into place Pull on the tools to remove the radio from the dash W3002408 Radio shown with optional CD changer cable Unplug the antenna and the connector for the radio If an optional CD changer is equipped this connector should also be unplugged 9 Remove the radio from the dash 79 Group 39 Delco Audio System Troubleshooting Installation 1 Plug in the electrical connector and the radio antenna If the CD changer is installed plug in its connector as well 2 Slide the radio into t
17. curtain rail assembly Add the ny 25 5 in lb Headlining lon spacers between headliner and 4 Fully engage fasteners pressing firmly cab screw holes Install all screws and 1 retaining clips Torque to 3 0 5 Nm Note the location of all interlocking 25 5 in lb fasteners on the headliner to aid in in stallation Position the headliner in the cab below its mounting location Con 8 nect the overhead light connectors Note Use caution not to bend the headliner to the point at which a permanent crease will show in the ma terial 6 Lift the headliner assembly into posi tion Use the front overhead roof storage pockets as a guide to assist in proper positioning Temporarily secure with a few interlocking fasteners W8001424 Use a blunt tool to go around the liner and push each remaining press fas tener together Note Be careful not to press so hard that the curtain clip is damaged 9 Install the front overhead storage cabi 24 4 Nm net assembly carrier rails Torque to 18 3 ft lb 24 4 Nm 18 3 ft lb 89 Group 39 Delco Audio System Troubleshooting 10 Use hand pressure to secure the re maining interlocking fasteners 11 Install the A pillar trim secure with the molding clip Repeat on opposite side 12 Install the grab handles Tighten the 24 4Nm bolts to a torque of 24 4 Nm 18 3 18 3 ft lb ft lb Install cover plugs 13 Install the door seals 14 Install the
18. do not remove Unplug the cable connector from the rear of the CD changer Remove the 4 mounting bolts from the brackets on the side of the changer Remove the mounting brackets Installation 1 Install the mounting brackets to the 3 5 0 5 Nm CD changer Using the 4 mounting 31 4 in lb bolts fit the mounting brackets to the sides of the player so the brackets face upward Torque the bolts 3 5 0 5 Nm 31 4 in Ib 2 Plug the cable connector into the rear of the CD changer 3 Mount the CD changer to the bottom side of the upper shelf above the pas senger seat Position the changer and install the 4 screws If there are other ground cables to be connected to the battery such as engine ECU satellite system etc connect the battery ground cable first then connect those grounds Electronic modules may be damaged when additional grounds are connected disconnected without the main battery ground connected Always reconnect the main battery ground first Reconnect the main negative battery cable 5 Turn the ignition switch ON and the turn on the radio power to test opera tion of the CD changer 82 Subwoofer Replacement Subwoofer Replacement Removal W3002448 1 Subwoofer speaker 2 Subwoofer connection Turn off the radio and unplug the con nector to the subwoofer Cut any wire ties fastening the wiring W3002443 To remove the subwoofer from the right side luggag
19. enough to evaporate the moisture e Hot Operation Additional heat generated from the heater ducts during humid conditions when combined with that generated from the integral compact disc player can create temperatures in excess of normal operating conditions If the CD player encounters these conditions it may produce distorted audio and temporarily mute These reac tions are normal and if these conditions occur remove the CD until the operating temperature has returned to normal 49 Group 39 Delco Audio System Troubleshooting Troubleshooting CD Changer Magazine Will Not Eject Note The magazine will not eject if a CD is in the optic area loaded to play of the changer Attempting to remove the magazine with a CD loaded will damage the CD and or the changer 1 2 3 Push the reset switch see Reset Switch page 48 Push the Eject button osc CHANGER W3003015 If the magazine does not eject it may be manually ejected if no CD is in the optic area of the changer Insert a hack saw blade or similar tool approximately 100 mm 3 9 in straight into the CD changer to the imme diate right of the two alignment arrows on the changer housing and magazine With the blade inserted move the blade to the left to manually release the magazine Note Do not force little pressure should be required Check the magazine and CD carriers for damage that may prevent proper ejection CD Changer Does Nothing
20. into necessary Connect the antenna cable place Install the torx bolts Torque the to the radio mounting bolts 3 5 0 5 Nm 31 4 in Ib 3 5 Route the right antenna lead cable through the cab along the same route as it was removed secure as neces sary Pull the cable outside the cab Install a new heat shrink 6 Pull the right mirror harness inside the cab and connect it W3003369 Install the cell phone antenna cable to the multiplexer box 125 Group 39 Delco Audio System Troubleshooting W3003366 Install the antenna lead in cable to the antenna and tie the cable to the mirror harness 8 Route the left antenna lead cable through the cab along the same route as it was removed and secure as nec essary Install a new heat shrink 9 Pull the left mirror harness inside the cab and connect it 10 Install the antenna lead in cable to the antenna tie the cable to the mirror harness 126 Antenna Lead In Cable Multiplexer Type Replacement 11 W3003374 Using heat gun J 25070 heat the heat 25070 shrink until it gets a good moisture seal Repeat on the other side 12 W3000641 Install the instrument cluster by tight 2 0 3 ening the 2 screws at the top of the 17 5 2 5 in cluster Torque to 2 0 3 Nm 17 5 Ib 2 5 in lb Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Multiplexer Type Replacement 13 16 Install th
21. mounting bolts Disconnect the lamp wiring connector Remove the cabinet from the vehicle 8 Remove the sleeper curtain rail as sembly Note The curtains do not need to be removed from the rail 9 Remove the bezels for the front over head roof pockets Note Use caution not to break the bezel mounting post 109 Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Ribbon Type Replacement 10 12 W8001428 Remove the front curtain rail assem bly Use a wide blade screwdriver to carefully pry the rail out of one side then the other side on each retaining clip After all retaining clips are re leased remove the front curtain rail assembly from the vehicle W3003260 1 Plastic rivets day cab vehicles only 2 Molding clip Note Use caution not to deform the Grab handle bolt cover rail assembly Remove the upper grab handle bolt cover from the A pillar trim Remove 11 the bolt and pull the handle out of the cover Pull the door seal away from the A pillar trim and the top of the door Remove the molding clip by pressing in the center button Remove the A pillar trim Repeat on the opposite side W3003095 Curtain rail or trim washer Plastic spacer Cab metal Headliner Screw OD E Check the retaining clips used to at tach the front curtain rail assembly Remove all that are attached with screws Note Nylon spacers are used be tween the headliner and the
22. or right channel dead or plays at a lower volume e Tape deck eats tape Use a cleaning kit to clean the tape head The Diagnostic Test Kit Kent More J39916 A contains a tape head clean ing kit see Diagnostic Test Kit Cassette Head Cleaning page 45 A cleaning kit will generally contain e Tape head cleaner e Cleaning solvent e Extra cleaning pads Internal Faults If the radio on the stereo receiver works properly but the cassette tape player does not there is likely an internal fault in the cassette tape player There are no field repairs available for the cassette tape player Replace if necessary Diagnostic Test Kit The Delco Audio System Diagnostic Kit Kent Moore J39916A can be used to diagnose cassette player complaints See Diagnostic Test Kit page 72 44 Group 39 Delco Audio System Troubleshooting Diagnostic Test Kit Cassette Head Cleaning Troubleshooting Note The premium sound system is equipped with a Bad Tape detector which must be turned off when cleaning the cassette player To turn off the Bad Tape detector see Cassette Tape Player page 19 Inspection of the player must take place before using the cleaning and diagnostic cassette Using a light source carry out a visual check through the cassette entry flap and ensure that there is no debris inside the player and that the tape is not wrapped around the capstan Before proceeding with the diagnostic casset
23. pedal and insert the lower center dash panel onto the weld studs Install the 4 torx screws in the top of the panel Torque to 3 5 0 5 Nm 31 4 5 in lb Pull the floor mat back and install the plastic nuts in the lower right dash panel and the panel under the center of the dash 7 Install the right front grab handle by starting the mounting bolt in the top of the handle Then torque to 24 4 Nm 212 30 in lb Install the bolt cap in the A pillar trim panel W8001166 24 4Nm 212 30 in Ib 77 Group 39 Delco Audio System Troubleshooting Premium Radio Replacement Premium Radio Replacement 2 Note This procedure applies only to replacement of the premium radio option For more information concerning replacement of the basic radio see Basic Radio Re placement page 75 Before beginning this procedure disconnect any ground cables connected to the battery such as en gine ECU satellite system etc Disconnect those grounds first to avoid damaging electrical compo nents Then disconnect battery negative and positive terminals to prevent electric shock disconnect the ground terminal first Failure to do so could cause personal injury Removal 1 W8002059 T8006862 Turn the ignition key OFF and discon 1 Panel tabs nect the main negative battery cable 2 Panel torx bolts Remove the top cover of the TEC cen ter by loosing the 2 bolts and lifting the
24. pro portionately with volume Pin F6 lt Pin F7 AC voltage changing pro portionately with volume Pin F10 Pin F11 AC voltage changing pro portionately with volume Pin F13 amp Pin F14 AC voltage changing pro portionately with volume Pin F15 Pin F16 AC voltage changing pro portionately with volume If not correct replace the amplifier If correct check the wiring to speakers and check the speakers Harness Connectors page 52 Troubleshooting 55 Group 39 Delco Audio System Troubleshooting Troubleshooting Amplifier Does Not Operate On All Channels e Check for AC voltage at suspect speakers see Speakers page 58 e Check speaker inputs from the stereo receiver Ignition key must be in ON or ACC position Back probe the ampli fier connector with a multimeter Kent Moore J39200 at the following measuring points Measuring Points Expected Value Pin E2 amp Pin AC voltage changing pro portionately with volume Pin E1 amp Pin F1 AC voltage changing pro portionately with volume Pin EA Pin E5 AC voltage changing pro portionately with volume Pin EG Pin E7 AC voltage changing pro portionately with volume If not correct check the stereo receiver or wiring har ness If correct check speaker outputs from the amplifier See Harness Connectors page 52 56 Group 39 Delco Audio System Trou
25. remove the plastic nuts Remove the lower right and center dash panels W3003368 Remove 3 torx screws from the lower left dash panel Pull the floor mat back and remove the plastic nut Remove the panel Antenna Lead In Cable Multiplexer Type Replacement oS T Deg k W3003367 Remove the lower side panel below the right A pillar Repeat on the other side W8001178 Remove the right dash speaker grill Remove the speaker mounting screws Disconnect the wiring connector and remove the speaker 119 Group 39 Delco Audio System Troubleshooting 11 W8001180 Remove 3 mounting screws from the right upper dash panel and 1 mount ing bolt from the speaker well Remove the dash panel from the vehicle 12 W3000667 Remove 4 torx bolts from the step on the right side of the cab remove the step 120 Antenna Lead In Cable Multiplexer Type Replacement 13 W3000662 Remove the upper tank fairing by re moving the 4 torx bolts W3000661 Remove 5 torx bolts from the step side of the right quarter fender section in the lower door frame and 2 bolts from the step bracket Remove the quarter fender fairing section Group 39 Delco Audio System Troubleshooting 15 Remove 3 screws from the right side drip molding and remove the molding 16 Remove 3 torx bolts from the bottom of the right si
26. than 1 0 2 The antenna and the lead in must be properly grounded for proper reception The antenna gets its ground at the mounting bracket Poor mounting of the antenna can cause poor reception and or interference To check the antenna and the lead in grounding disconnect the battery negative connector and check from the negative battery cable con nector E to the lead in cable shield C at the radio 70 Group 39 Delco Audio System Troubleshooting Troubleshooting Test Antenna Generally antenna systems will have very little resistance from the antenna mast to the center conductor tip where it plugs into the radio and very little resistance from the antenna base to ground However in practice it is difficult to test antennas in the VN series vehicle due to mounting locations or multiplex antenna circuitry As an alternative to com plex antenna testing a simple test antenna lead in cable can be constructed to help isolate reception or noise problems To use the technician must gain access to the antenna input connection at the radio disconnect the vehicle antenna and connect the test antenna Connect the test antenna ground wire to a good vehicle ground If radio reception improves it is likely that the antenna mast or lead in is at fault see No AM Signal Weak FM Sig nal page 70 If radio noise improves the vehicle lead in cable may need to be moved away from electrically noisy devices see Noise Sniffer page 64
27. the right hand arrow gt gt button 13 Press the left hand arrow lt lt button lightly to cancel fast forward and return to play mode Fast Reverse To activate fast reverse press the right hand arrow lt lt button 13 Press the right hand arrow gt gt button lightly to cancel fast reverse and return to play mode Program Press both direction buttons 13 lt lt and gt gt simultaneously The direction arrow will change in the display window and the player will play the other side of the tape Eject Press EJT 14 button firmly to eject a tape Note When a tape is ejected the radio becomes operative It is not necessary to eject a tape when leaving the vehicle a solenoid removes internal pressure automatically Design and Function Group 39 Delco Audio System Troubleshooting Premium Sound System Design and Function Delco Electronics PSCAN SCAN PWR push Pull A The premium sound system features a Delco Heavy Duty High Performance stereo receiver available with ei ther a cassette or a CD player The stereo receiver is installed in the dash and receives constant battery power for the clock and the memory functions The premium stereo has the ability to detect and display some error codes from the cassette or CD player and from the CD changer if equipped Some of the standard features of the premium sound system include e THEFTLOCK theft det
28. to 3 5 0 5 Nm 31 4 5 in lb Antenna Lead In Cable Fixed Mast Type Day Cab Replacement a W8001178 13 W8001166 Pull the floor mat back and install the plastic nuts in the lower right dash panel and the panel under the center of the dash 14 Install the headliner in the vehicle Connect the lamp assembles Note the position of the interlocking fasteners Start with the front of the headliner down and lift up on the rear to engage the rear headliner lip behind the rear wall trim At the same time work the side edges behind the B pillar trim Note Two technicians are required for this step 97 Group 39 Delco Audio System Troubleshooting Antenna Lead ln Cable Fixed Mast Type Sleeper Cab Replacement 15 W3003095 Curtain rail or trim washer Plastic spacer Cab metal Headliner Screw OD E GO With one technician holding the head liner allow the front of the headliner down enough to install the mounting screws The mounting screws and the trim should be installed up through the headliner and a spacer installed be tween each screw and the cab mounting holes A thin plastic lip on the spacer will hold it in mounting po sition After all screws and spacers are in place carefully lift the headliner up to the roof Note Two technicians are required for this step 98 16 1 3 4 W3003110 1 Roof plate 2 Roof panel Headlining 4 Fully engage f
29. to a good chassis ground 66 Group 39 Delco Audio System Troubleshooting Troubleshooting Capacitors Capacitors are used to shunt AC noise to ground or to slow changes in voltage on a circuit Any capacitor that will be installed must be rated for 50 V operating voltage minimum The capacitor C should be placed as close to the noise as possible in order to be most effective CY VY A gt DC AC DC T W3003068 Capacitors are connected in parallel to a DC circuit because the capacitor will act like an open circuit to a DC circuit Capacitors will act like a resistance to an AC circuit and therefore short undesirable alternating currents to ground Capacitors may be packaged in several ways Electrolytic capacitors by themselves will be marked with positive and negative leads and must be installed with the correct polarity de pa ppm W3003066 220 F 50 V capacitor P N 176007 Fuse block capacitor P N 176008 Feed through capacitor P N 176009 0 47 F capacitor P N 176010 Feed through type capacitors have already taken care of connecting the capacitor in parallel with the correct polarity To install the feed through capacitor open the DC circuit then install the device in series The feed through capacitor body must be connected to a good ground for the capacitor to be effective Inductors EYN Se eT Ye DC AC L DC W3003070 L Inductor Inductors sometimes called a
30. used to at tach the front curtain rail assembly Remove all that are attached with screws Note Nylon spacers are used be tween the headliner and the cab mounts Note their position for re assembly W8001428 Remove the front curtain rail assem bly Use a wide blade screwdriver to carefully pry the rail out of one side then the other side on each retaining clip After all retaining clips are re leased remove the front curtain rail assembly from the vehicle Note Use caution not to deform the rail assembly 100 Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Fixed Mast Type Sleeper Cab Replacement W3003260 1 Plastic rivets day cab vehicles only 2 Molding clip 3 Grab handle bolt cover Remove the upper grab handle bolt cover from the A pillar trim Remove the bolt and pull the upper grab handle out of the cover Repeat on the other side Pull the door seal away from the A pillar trim and the top of the door Remove the molding clip by pressing in the center button Remove the A pillar trim Repeat on opposite side 10 Release the 2 retaining clips in the center of the headliner by pressing in the center button Remove the retain ing clips Note May not apply depending on the interior trim level 11 W3003261 1 Headliner 2 Xmas tree fastener 3 Removal tool J38778 Remove the 2 Xmas tree fasteners in J38778 the center of the headliner with the re moval tool J3
31. 0 5 Nm 25 5 in lb Group 39 Delco Audio System Troubleshooting 21 Install the right sun visor Torque to 5 5 0 8 Nm 0 8 Nm 45 7 in Ib 45 7 in lb 22 Install the front left overhead storage 2 0 3Nm cabinet together with the sun visor In 17 3 in lb stall the 4 mounting screws with their 3 0 5 Nm rubber washer to the carrier rail 25 5 in lb Torque to 2 0 3 Nm 17 in lb Install the 6 screws with their rubber washer over the windshield Torque to 0 5 Nm 25 5 in lb Antenna Lead In Cable Fixed Mast Type Day Cab Replacement Antenna Mast Multiplexer Type Replacement The multiplexer mast antenna system is standard on the VNL 660 and the VNL 770 and optional on other VN se ries vehicles Determine which antenna system is used before beginning repairs Note Do not confuse a CB antenna mast with a multi plexer antenna mast see Antenna Types page 34 1 W3003488 1 Mirror assembly 2 Mast 3 Hex adapter Remove the multiplexer antenna mast by using a wrench to hold the mount ing base hex adapter to prevent it from turning 2 Install the new multiplexer antenna 24 4Nm mast by using a wrench to hold the 18 3 ft lb mounting base hex adapter to prevent it from turning Torque to 24 4 Nm 18 3 ft lb 91 Group 39 Delco Audio System Troubleshooting Antenna Lead in Cable Fixed Mast Type Day Cab Replace ment The fixed mast antenna is stand
32. 2 1 Nm 9 0 7 ft lb 128 Group 39 Delco Audio System Troubleshooting 21 Install 3 torx bolts in the lower left side mirror mounting arm Torque to 24 4 Nm 18 3 ft lb 22 Install the right mirror backing together with the bottom channel w3000665 24 4Nm 18 3 ft lb Antenna Lead In Cable Multiplexer Type Replacement Install the left side drip molding with 3 screws Torque the top 2 screws to 1 2 0 2 Nm 10 6 1 8 in lb and the bottom screw to 3 0 5 Nm 26 4 in Ib 24 Install the left side quarter fender sec tion Start all bolts but do not tighten until after aligning Torque to 24 4 Nm 18 3 ft lb 25 Install the left fairing Start all bolts and align the fairing before tightening Torque to 24 4 18 ft lb 26 Install the left step Start all 4 bolts and align the step before tightening Torque to 12 1 Nm 9 0 7 ft lb 27 Install the panel below the right A pillar W3000664 1 2 0 2 Nm 10 6 1 8 in Ib 3 0 5 Nm 26 4 in lb 24 4Nm 18 3 ft lb 24 4Nm 18 3 ft lb 12 1 Nm 9 0 7 ft lb 129 Group 39 Delco Audio System Troubleshooting ws001131 5 Nm Pull the right side floor mat back and 3 5 1 4 5 in Ib insert the lower right dash panel onto 3 the weld studs Install the 7 torx screws in the top of the panel Pull the mat back at the accelerator pedal and insert the lower center d
33. 8778 Use caution not to damage the headliner material Note May not apply depending on the interior trim level 101 Group 39 Delco Audio System Troubleshooting 12 Lu W8001424 The headliner is now held in place by interlocking fasteners Start at one door and work under the headliner with fingers to pop apart the interlock ing fasteners The fasteners should be at each remaining front curtain rail re taining clip and at various points over the body of the headliner A long screwdriver or similar tool may be used to free the hard to reach inter locking fasteners After all fasteners are released and the headliner drops disconnect the lamp assembles and remove the headliner from the vehicle Note Use caution not to bend the headliner to the point at which a permanent crease will show in the ma terial Remove the 7 torx screws from the lower right dash panel Remove the 4 screws from the center dash panel 102 Antenna Lead In Cable Fixed Mast Type Sleeper Cab Replacement 14 W8001165 Pull the floor mat back and remove the plastic nuts Remove the lower right and center dash panels 15 a 8001178 Remove the right dash speaker grill Remove the speaker mounting screws Disconnect the wiring connector and remove the speaker W8001131 Group 39 Delco Audio System Troubleshooting W8001 180 Remove 3 mounting s
34. 8RB RHS Rear Input E5 498RA RHS Rear Input E6 498LA LHS Rear Input E7 498LB LHS Rear Input E8 0 Ground 9 0 Ground 11 490 12 V Supply 1 F1 COIL E12 490 12 V Supply COI MET E13 4 LHS Dash Speaker CIL EIE E14 L4 LHS Dash Speaker Te Sea COIL E15 16 LHS Door Speaker CIL EHE E16 L6 LHS Door Speaker CoOL CJL F1 499RB RHS Front Input EHE LIL F2 R4 RHS Dash Speaker CIJ LOIL F3 R4 RHS Dash Speaker CIC E16 Fig S2 Subwoofer Coil 2 F5 52 Subwoofer Coil 2 F6 R6 RHS Door Speaker F7 R6 RHS Door Speaker F10 S1 Subwoofer Coil 1 F11 S2 Subwoofer Coil 1 F13 R RHS Rear Wall Speaker F14 R RHS Rear Wall Speaker F15 L LHS Rear Wall Speaker F16 L LHS Rear Wall Speaker Cavity Circuit Function 1 499RA RHS Dash Speaker 499LA LHS Dash Speaker 490 12 V Supply 141 Dimmer Control 498RA RHS Door Speaker 498LA LHS Door Speaker 498LB LHS Door Speaker 498RB RHS Door Speaker 0 Ground 4 90 Light Control 492 12 V Supply 499LB LHS Dash Speaker 499RB RHS Dash Speaker For schematic see Foldout A Amplified 8 Speaker Subwoofer System Schematic 52 Group 39 Delco Audio System Troubles
35. CD until the operating temperature has returned to normal Internal Faults If the radio on the stereo receiver works properly but the CD player does not there is likely an internal fault in the CD player There are no field repairs available for the CD player Replace if necessary Diagnostic Kit test The Delco Audio System Kit Kent Moore J39916A can be used to diagnose CD player complaints See Diagnostic Test Kit page 72 46 Group 39 Delco Audio System Troubleshooting CD Changer Harness Connectors STEREO RECEIVER END CONNECTOR ORANGE B GRAY GROUND GREEN ILLUMINATION PURPLE E amp DATA RED LEFT AUDIO WHITE RIGHT AUDIO BLACK aup1o COMMON Ia sm we pe mm SHIELD Note The shield wire is not connected to the stereo receiver end Troubleshooting CD CHANGER END CONNECTOR CD Changer Harness Stereo Receiver End Connector Cavity Color Function 7 Not Used 8 Green Illumination 9 Not Used 10 White Right Audio 11 Red Left Audio 12 Black Audio Common 13 Gray Ground 14 Purple E amp Data 15 Or Battery 12V ange CD Changer End Connector a ots Cavity Color Function 1 Red Left Audio 2 White Right Audio 3 Black Audio Common 4 Shield 5 Or Battery 12V ange 6 Not Used 7 Gray G
36. ER FRT SPEAKERIFRT REAR SPKRIRR 5 NOTE GROUND GROUND W3003007 Note For detailed vehicle specific electrical schematics see VN Series Electrical Schematics Group 37 Foldout A Amplified 8 Speaker Subwoofer System Schematic BATTERY 12 VOLT IGNITION 12 VOLT ACCESSORY 12 VOLT FUSE 38 10A FUSE 45 SA 490 TO DIMMER CONTROL TO LIGHT CONTROL 492 RADIO AND TAPE DECK ASSEMBLY a be ak 2 Faia SN LEFT RIGHT LEFT LEFT RIGHT RIGHT BUNK BUNK DOOR DASH DOOR DASH SPEAKER SPEAKER SPEAKER SPEAKER SPEAKER SPEAKER GROUND W3003399 Note For detailed vehicle specific electrical schematics see VN Series Electrical Schematics Group 37 Foldout B 6 Speaker System Schematic BATTERY 12 VOLT IGNITION 12 VOLT ACCESSORY 12 VOLT FUSE 38 IQA 490 TO DIMMER CONTROL TO LIGHT CONTROL 492 RADIO AND TAPE DECK ASSEMBLY BLK or LEFT DOOR GROUND SPEAKER RIGHT DASH SPEAKER LEFT DASH SPEAKER vi IC DR RIGHT DOOR SPEAKER W3003396 Note For detailed vehicle specific electrical schematics see VN Series Electrical Schematics Group 37 Foldout C 4 Speaker System Schematic VOLVO Volvo Trucks North America Inc P O Box 26115 Greensboro NC 27402 6115 Volvo Trucks Canada Ltd 6490 Vipond Drive Mississauga Ontario LST 1W8 http Awww volvotrucks volvo com PV776 TSP109859 1000 12 98 Volvo Trucks North America Inc 98
37. M signal De pending on the type antenna system used the lead in cable may be tested with an ohmmeter The multiplex antenna system with its electronic circuitry and no removable connection at the electronic module cannot be effectively tested Also due to the inaccessibility of the antenna end connection it may not be practical to test the lead in cables on rib bon and mast type systems As an alternative to lead in cable testing a test antenna lead in cable may be used see Test Antenna page 71 If both ends of the lead in cable can be accessed the chart below can be used as a guide to determine if the lead in cable is OK When checking resistance cautiously wiggle the lead in tip and cable and watch for intermittent readings Note Zero the meter to avoid a false reading A B W3003473 Tip for radio D Metal case Tip for antenna E Negative battery cable Metal case Measuring Points Expected Value AP WARNING ASB less than 3 5 Q less than 1 0 Q When removing battery ground cable disconnect other ground cables connected to the battery first A amp D infinite such as engine ECU satellite system etc then re oe move the battery ground cable Electronic modules infinite may be damaged when additional grounds are con Asc infinite nected disconnected without the main battery ground connected Always disconnect the main battery BoD infinite ground last CeeE less
38. Magazine 1 Open the slide door 2 Press the eject button The magazine will eject auto matically 3 Pull the magazine straight in the arrow direction until it comes off the unit W3002996 29 Group 39 Delco Audio System Troubleshooting Design and Function Playing CDs 2 3 W3003538 be Play CDs Loaded in the CD Changer Make sure the CD changer is loaded 4 While the CD is playing use the VOL knob 2 AU DIO button 3 and the push button 4 just as when 2 Turn on the radio playing a CD player see Compact Disc Player 3 Press the CD changer button 1 on the radio When page 21 a CD begins to play the display will show the disc and track number followed by the elapsed time on the track and then return to the default display you have chosen 30 Group 39 Delco Audio System Troubleshooting Design and Function Amplifier W3003014 The purpose of an amplifier is to increase the power of a noticeable distortion The Delco Electronics amplifier in voltage or current signal The output signal of an ampli the VN 770 s premium speaker package has been tuned fier may consist of the same frequencies as the input with special volume levels and filters at specific frequen signal or it may consist of only a portion of the frequen cies on all eight channels to optimize the system cies of the input signal as in the case of a subwoofer or components for the vehicle s unique acoustics a mid range amp
39. Measuring Points Expected Value Pin 1 Pin 13 AC voltage changing pro portionately with volume Pin 2 Pin 12 AC voltage changing pro portionately with volume Pin 8 Pin 5 AC voltage changing pro portionately with volume Pin 6 Pin 7 AC voltage changing pro portionately with volume If correct check speakers or wiring harness After performing the above tests if no faults were found replace the stereo receiver Test operation after replacement See Harness Connectors page 39 40 Group 39 Delco Audio System Troubleshooting Troubleshooting The Receiver Will Not Maintain Pre Sets e The stereo receiver should maintain preset stations and the time even with the ignition key in the OFF position If the preset stations are not maintained check the constant power source and ground Ignition key must be in OFF position Back probe the wiring harness connector to the stereo receiver Measuring Points Expected Value Pin 11 Alternate ground B Pin 9 Alternate ground less than 1 9 If not correct check for blown fuse or damage incorrect truck wiring and take appropriate corrective action After performing the above test if no faults were found replace the stereo receiver Test operation after replacement No Sound From Some Speakers Note If equipped with an amplifier only the upper two rear bunk speakers will play in the sleep mode Also if there is a failure in t
40. Service Manual Trucks Group 39 Delco Audio System Troubleshooting VN PV776 TSP1 09859 WOLWVO Foreword The descriptions and service procedures contained in this manual are based on de signs and methods studies carried out up to December 98 The products are under continuous development Vehicles and components produced after the above date may therefore have different specifications and repair methods When this is believed to have a significant bearing on this manual supplementary ser vice bulletins will be issued to cover the changes The new edition of this manual will update the changes In service procedures where the title incorporates an operation number this is a refer ence to an S R T Standard Repair Time Service procedures which do not include an operation number in the title are for gen eral information and no reference is made to an S R T The following levels of observations cautions and warnings are used in this Service Documentation Note Indicates a procedure practice or condition that must be followed in order to have the vehicle or component function in the manner intended Caution Indicates an unsafe practice where damage to the product could occur Warning Indicates an unsafe practice where personal injury or severe damage to the product could occur Danger Indicates an unsafe practice where serious personal injury or death could oc cur Volvo Trucks North America Inc Greensb
41. Speaker System Schematic and Foldout C 4 Speaker System Schematic 39 Group 39 Delco Audio System Troubleshooting Troubleshooting Note The following checks are valid for both non amplified and amplified sound systems However always check the amplifier system before replacing the stereo receiver Refer to Amplifier page 52 Before beginning stereo receiver troubleshooting see Troubleshooting Consideration page 11 No Stereo Receiver Operation e Confirm no operation of receiver or playback devices If the receiver operates but the playback device does refer to Cassette Tape Player page 44 or CD Player page 46 e Check for power supply Ignition key must be in ON or ACC position Back probe the wiring harness connector to the stereo receiver Measuring Points Expected Value Pin 3 Alternate ground B If not correct check for blown fuse or damage incorrect truck wiring and take appropriate corrective action e Check for proper ground Ignition must be in OFF position Back probe the wiring harness connector to the stereo receiver Measuring Points Expected Value Pin 9 Alternate ground less than 12 If not correct check for damage incorrect truck wiring and take appropriate corrective action e Check speaker outputs from the receiver Ignition must be in ON or ACC position Back probe the wiring harness connector to the stereo receiver
42. able Radio Monitor This feature allows you listen to the radio while a tape is rewinding or fast forwarding The display will read RADIO ON or RADIO OFF If the radio detects a bad cassette BAD TAPE will ap pear on the display and the tape will be ejected The tape may be damaged or too tight If it is damaged try a new tape If the tape is too tight the player can not turn the tape hubs Remove the tape and hold it with the open end down Try to turn the right hub counterclockwise with a pencil Turn the tape over and repeat If the hubs do not turn easily the tape may be damaged and should not be used in the player Note When using a CD adapter or a cleaning cassette the bad tape detector must be turned off Bad Tape Detector ON OFF 1 the ignition ON and the radio off 2 Press and hold the tape button 2 for 5 seconds The display will read BAD TAPE DETECT OFF a beep confirms that the bad tape detector is off until the next ignition cycle Group 39 Delco Audio System Troubleshooting Cleaning the Tape Player After 24 hours of cassette play the display will read TIME TO If then pressing the DISPL button 7 CLEAN TAPE PLAYER will appear Note Avoid touching the cassette head with magnetic or hard objects or and lubricating the player mechanism 1 Turm off the Bad Tape Detect 2 Insert a wet type nonabrasive scrubbing cassette cleaner See Diagnostic Test Kit Cassette Head Cleani
43. al storage error protection and disc longevity create a high fidelity audio medium Design and Function 25 Group 39 Delco Audio System Troubleshooting Compact Disc Care Particular care and handling should be taken to preserve compact discs 26 Mini CDs called about 0 1 4 in in di ameter in most cases will not eject and should not be used The ability of the compact disc to play is adversely affected by fingerprints dirt scratches and some times data defects caused during manufacturing of the disc These can decrease the amount of light reflected from the recorded surface thus affecting sound quality If the disc becomes soiled gently wipe any soil from the center of disc to the outer edge Note Do not use volatile chemicals such as ben zine thinner record sprays or antistatic agents which can damage the disc If a cleaner is needed use a solution of mild neutral detergent Do not attempt to play cracked or warped discs Should a player exhibit playability problems substi tute another clean new disc to verify whether the problem in the disc or the player The disc revolves at a high speed within the player so a defective disc should not be used Be sure never to touch the signal surface when han dling discs Pick up discs by grasping the outer edge Do not affix paper or tape to the disc and avoid scratching the disc As with traditional audio records compact discs
44. ant in the playback of a cassette are the supply reel take up reel capstan pinch rollers and the tape head When the cassette is properly loaded the motor starts The motor will then rotate the capstan The capstan is a rod which comes up rotates and al lows the tape to feed over the head One of the pinch rollers comes forward and squeezes the tape between it and the capstan Simultaneously the head pulls into place For the cassette to play the head can be no more than 0 7 0 8 micros away from the tape head A human hair is typically 60 100 micros thick The tape then passes over the playback head The magnetic informa tion stored on the tape is read by the playback head and then converted into an electrical signal This signal on the order of 90 mV millivolts is sent to a pre amplifier in the cassette player The pre amplifier creates a signal of about 0 58 V This signal is sent to the receiver where it is amplified and played at the specified level Cassette Tape Care Cassette tapes longer than 90 minutes may be too thin to work well with automotive cassette player Do not use cassettes that are deformed dirty or contam inated Cassette tapes that are not properly stored in their plas tic cases away from contaminant s direct sunlight and extreme heat may not properly operate and could cause premature failure of the tape player Cassette tapes are subject to wear and the sound qual ity may degrade ove
45. antenna system e Antenna lead in cable must have low resistance e All antenna cable connectors must be in good condition and tight e Antenna base must be well grounded e Lead in to radio connection must be tight and low resistance Check for excess noise reaching the antenna system e Pinpoint the noise source See Noise Sniffer page 64 e Route the antenna cable away from electrical electronic noise circuits e Check for malfunctioning electrical electronic components on the vehicle e Electrically noisy devices can sometimes be filtered or suppressed e Check for poor grounds or other poor connections in noisy circuits Group 39 Delco Audio System Troubleshooting Troubleshooting Side Way Noise W3003059 1 Radio receiver 2 Speaker Side way noise is any noise that enters stereo receiver by a radiated field through the stereo receiver case Possible Cause e Auxiliary electrical components monitors cell phones notebook computers e Noisy wiring or harness too close to the stereo receiver e Strong magnetic fields reaching the cassette tape player pickup head e High current wiring too close to the stereo receiver Troubleshooting Hints e f noise is present with the stereo receiver on but goes away when the receiver is moved out of its mounting location it is likely that sideway noise is the problem e Disconnect any auxiliary electrical components If noise goes away change the mounting locatio
46. ard on the VNL and VNM day cab vehicles For the VNL 420 sleeper cab see Antenna Lead In Ca ble Fixed Mast Type Sleeper Cab Replacement page 99 The lead in cable is attached permanently to the an tenna base These vehicles may also be equipped with optional multiplexer antenna system Determine which antenna system is used before beginning repairs Removal 1 Remove the front left overhead storage cabinet together with the sun visor Note On vehicles that are not equipped with an overhead storage cabinet remove only the sun visor 2 Remove the right sun visor 3 If equipped remove the front left stor age cabinet carrier rail 4 Remove the coat hooks from the rear of the headliner 92 Antenna Lead In Cable Fixed Mast Type Day Cab Replacement 5 If equipped remove the rear speakers from the headliner W3003260 1 Plastic rivets day cab vehicles only 2 Molding clip 3 Grab handle bolt cover Remove the upper grab handle bolt cover from the A pillar trim Remove the bolt and pull the handle out of the cover Pull the door seal away from the A pillar trim and the top of the door Remove the molding clip by pressing in the center button Remove the plas tic rivets at the top of the A pillar trim Remove the A pillar trim Repeat on opposite side Group 39 Delco Audio System Troubleshooting W3003095 Curtain rail or trim washer Plastic spacer Cab metal Headliner Scre
47. arnesses The sniffer can be made from an old piece of antenna lead in from a mast or power antenna The longer lead in the better since it will make the sniffer more flexible as a diagnostic tool W3003061 1 Center conductor wire 2 50 2 in of coax shield cut away 3 Antenna lead in with antenna base connector removed Construct sniffer per above graphic The 50 mm 2 in section with the outer coating and braided shield stripped back becomes the antenna when the sniffer is plugged into the radio s antenna socket It can then be used to probe and search out bot spots Procedure 1 While listening to the complaint noise disconnect the antenna and plug the sniffer into the antenna socket 2 Turn the radio volume up 3 When searching for the noise source keep fingers off of the probe otherwise erroneous results will be received W3003062 1 Noise 2 Wire from harness 3 Sniffer When checking for noise on a wire the best results will be achieved when the sniffer is placed parallel to the wire The sniffer can also be used to determine from what area of the dash the noise is being generated onto the antenna It must be noted that the sniffer will also locate normal hot spots However a technician who becomes familiar with the sniffers capability will find it the most useful diagnostic tool in noise suppression work 64 Group 39 Delco Audio System Troubleshooting Troubleshooting Noise Suppression The correct
48. as been designed with a shock absorbing suspension much like that of a car Only under extreme operating temperatures and severe shock or vibration should the music be temporarily muted The tem porary muting is considered normal and should not cause damage to the player or compact disc The player will resume normal playing when the vibration or shock subsides e Dew Point Operation Under certain cold temperature and humidity conditions moisture in the air will condense on the surrounding sur faces This most commonly occurs in the spring and fall when moisture accumulates on the windshield and body of the vehicle if it is left out at night The heart of the CD player is a laser lens assembly reading a shiny digital encoded disc If this lens or disc becomes fogged up with moisture the mechanism will have difficulty reading the disc and reproducing the music When this condition exist the player may intermittently mute This type of reaction is considered normal and will clear as soon as the CD or the player has warmed up enough to evaporate the moisture e Hot Operation Additional heat generated from the heater ducts during humid conditions when combined with that generated from the integral compact disc player can create temperatures in excess of normal operating conditions If the CD player encounters theses conditions it may produce distorted audio and temporarily mute These reac tions are normal and if these conditions occur remove the
49. ash panel onto the weld studs Install the 4 torx screws in the top of the panel Torque to 3 5 0 5 Nm 31 4 5 in lb I RO 29 W8001166 Pull the floor mat back and install the plastic nuts in the lower right dash panel and the panel under the center of the dash 130 Antenna Lead In Cable Multiplexer Type Replacement W8001180 Install the right upper dash with 3 mounting screws and 1 mounting bolt in the speaker well 31 A W8001178 Connect the wiring connector and in stall the right dash speaker and the grill 32 Install the right grab handle Torque to 24 4 Nm 24 4 Nm 18 3 ft lb Replace the 18 ft lb bolt cover trim 33 Adjust the steering column back and 5 0 8 Nm up where possible Install the front 44 7 1 1 cover of the steering column by in stalling torx bolts Torque to 5 0 8 Nm 44 7 16 Antenna Lead In Cable Multiplexer Type Replacement Group 39 Delco Audio System Troubleshooting W3003367 ai Par an 24909 ai AN Install the left panel below the A pillar W3000648 5 0 8Nm 44 7 in lb and up where possible Install the rear cover by installing torx bolts and at switches Torque bolts to 5 0 8 Nm 44 7 16 Adjust the steering column forward taching rubber grommets at stalk 131 W3000655 Replace 2 clips at the bottom of the steering column cover Group 39 Delco Audi
50. asteners pressing firmly Install the 2 Xmas tree fasteners in the center of the headliner Install the 2 re maining clips in the center of the headliner Press in the center button to secure Engage the securing interlock ing fasteners Note Two technicians are required for this step Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Fixed Mast Type Sleeper Cab Replacement 17 Install the screws securing the front and sides of the headliner Torque to 3 0 5 Nm 25 5 in Ib 18 Install the B pillar trim 19 Install the A pillar trim Install the molding press in the center bottom to secure If equipped install the plastic rivet fasteners 20 Install the door seals 21 Install the grab handles Torque to 24 4 Nm 18 3 ft lb Replace the bolt cover trim 22 If equipped install the rear speakers in the headliner 23 Install the coat hooks to the rear of the headliner Torque to 3 0 5 Nm 25 5 in lb 24 Install the front overhead storage cabi net carrier rail Torque to 24 4 Nm 18 3 ft lb 25 Install the right sun visor Torque to 5 0 8 Nm 45 7 in Ib 26 Install the front overhead storage cabi net together with the sun visor Torque to 5 0 8 Nm 45 7 in lb Note Install only the sun visor if the vehicle is not equipped with a front overhead storage cabinet 0 5 Nm 3 25 5 in lb 24 4Nm 18 3 ft lb 5 Nm 5 in lb
51. atellite system etc Disconnect those grounds first to avoid damaging electrical compo nents Then disconnect battery negative and positive terminals to prevent electric shock disconnect the ground terminal first Failure to do so could cause personal injury Removal W8001165 1 Pull the floor mat back and remove the plastic nuts Remove the lower right AN and center dash panels T8006862 Turn the ignition key OFF and discon nect the main negative battery cable 2 Remove the right front grab handle s upper bolt cover from the A pillar trim Remove the bolt and pull the handle out of the trim 75 Group 39 Delco Audio System Troubleshooting RSF W3000675 1 Lower edge of dash 2 Nut at radio mounting bracket To avoid damage to the radio or mounting bracket re move the nut from the rear of the bracket Failure to remove the nut may result in bending the bracket and damaging the radio Remove the nut from the rear of the radio mounting bracket This nut is ac cessible through the opening left when the trim panel was removed W3000702 Basic radio removal tools Volvo P N 176000 Insert the removal tools into the face of the radio 76 Basic Radio Replacement W3000674 When the tools are inserted pull slightly apart to unlock the radio from the housing Pull on the removal tools to slide the radio out of the housing Disco
52. before InoP appears again 37 Group 39 Delco Audio System Troubleshooting Troubleshooting 38 Group 39 Delco Audio System Troubleshooting Repair Replacement Troubleshooting As an alternative to expensive replacement Delco Electronics Stereo Receivers may be repaired at approved service centers Call D amp B Auto Radio at 1 800 323 4813 for repair information Harness Connectors 4 Speaker System 6 Speaker System Cavity Circuit Function 1 A499RF RHS Dash Speaker 2 4991 LHS Dash Speaker 3 490 A 12 V Supply Ac cessory 4 141R Dimmer Control 5 497R RHS Door Speaker 6 497L LHS Door Speaker 7 497L LHS Door Speaker 8 497R RHS Door Speaker 9 OC F Ground 10 90A Light Control 11 492 12 V Supply Bat tery 12 A499LF LHS Dash Speaker 13 499 RHS Dash Speaker Cavity Circuit Function 1 499RF RHS Dash Speaker 2 4991 LHS Dash Speaker 3 490 A 12 V Supply Acces sory 4 141R Dimmer Control 5 498RR RHS Rear Speak ers 6 498 LHS Rear Speak ers 7 498LR LHS Rear Speak ers 8 498 RHS Rear Speak ers 9 OC F Ground 10 90A Light Control 11 492 12 V Supply Bat tery 12 499LF LHS Dash Speaker 13 499RF RHS Dash Speaker For schematics see Foldout B 6
53. bleshooting e Check speaker outputs from the amplifier Ignition key must be in ON or ACC position Back probe the amplifier connector with a multimeter Kent Moore J39200 at the following measuring points Measuring Points Expected Value Pin E13 E14 AC voltage changing pro portionately with volume Pin E15 E16 AC voltage changing pro portionately with volume Pin F2 AC voltage changing pro portionately with volume Pin E2 AC voltage changing portionately with volume Pin F4 F5 AC voltage changing pro portionately with volume Pin F6 F7 AC voltage changing pro portionately with volume Pin F10 F11 AC voltage changing pro portionately with volume Pin F13 amp F14 AC voltage changing pro portionately with volume Pin F15 F16 AC voltage changing pro portionately with volume If not correct replace the amplifier If correct check the wiring to speakers and the speakers on affected channels 10See Harness Connectors page 52 Troubleshooting 57 Group 39 Delco Audio System Troubleshooting Troubleshooting Speakers No Sound From Speaker With the speaker removed from its mounting location and wiring harness disconnected the following checks can be performed Visually inspect for obvious damage such as a torn cone or wiring from the connector to the voice coil broken With a multimeter K
54. cab mounts Note their position for re assembly 110 Group 39 Delco Audio System Troubleshooting 13 Lu SI W8001424 The headliner is now held in place by interlocking fasteners Start at one door and work under the headliner with fingers to pop apart the interlock ing fasteners The fasteners should be at each remaining front curtain rail re taining clip and at various points over the body of the headliner A long screwdriver or similar tool may be used to free the hard to reach inter locking fasteners After all fasteners are released and the headliner drops disconnect the lamp assembles and remove the headliner from the vehicle Note Use caution not to bend the headliner to the point at which a permanent crease will show in the ma terial W8001131 Remove the 7 torx screws from the lower right dash panel Remove the 4 screws from the center dash panel Antenna Lead In Cable Ribbon Type Replacement g W8001165 Pull the floor mat back and remove the plastic nuts Remove the lower right and center dash panels 16 A W8001178 Remove the right dash speaker grill Remove the speaker mounting screws Disconnect the wiring connector and remove the speaker 111 Group 39 Delco Audio System Troubleshooting W8001 180 Remove 3 mounting screws from the right upper dash panel and 1 mounting bolt in the speaker well Remove t
55. code 10 Repeat step 5 8 to confirm your code 11 Press BAND 1 The display will show SECURE to let you know that your radio is secure If THEFT LOCK has not been activated will show the display To activate repeat steps 4 11 To disable the THEFTLOCK Note Pause no more than 15 seconds between the steps 1 Turn the ignition ON 2 Turn the radio off 3 Press the push buttons 1 and 4 3 together until SECURE shows up on the display 4 Press MN 5 The display will show 0000 5 Press MN 5 as many times as needed to make the last digits agree with the secret code 6 Press HR 6 as many times as needed to make the first digits agree with the secret code 7 Confirm that the code on the display matches the code you have chosen 8 Press BAND The display will show indicat ing that the radio is no longer secure Note If the display shows SECURE the incorrect code was entered Repeat steps 1 8 Group 39 Delco Audio System Troubleshooting Infrared Remote Control 1 2 3 4 10 Press the PWR button 1 to turn the radio on or off Press the VOL button 2 to increase the volume Press the VOL button 3 to decrease the volume Press the mute button 4 to reduce the volume to a minimum The display will read MUTE To deactivate mute press this button again Press this button 5 to move to the next preset ra dio station Press the BAND button 6
56. crews from the right upper dash panel and 1 mounting bolt in the speaker well Remove the dash panel from the vehicle 17 Remove the right side right door HVAC duct 18 2 s s 4 al eS 0 V W3000675 1 Lower edge of dash 2 Nut at radio mounting bracket Remove the nut from the rear of the radio mounting bracket Access the nut from under the dash Antenna Lead In Cable Fixed Mast Type Sleeper Cab Replacement 19 W3002355 Premium radio removal tool Volvo P N 3949548 left 3949549 right W3000702 Basic radio removal tool Volvo P N 176000 Insert the radio removal tool into the release holes on the radio face until the tools locks in place With the tools inserted pull on the tools to slide the radio out of the dash 20 W3000674 Disconnect the antenna lead in cable from the back of the radio 103 Group 39 Delco Audio System Troubleshooting Antenna Lead ln Cable Fixed Mast Type Sleeper Cab Replacement 21 W3003140 Remove the antenna lead in cable Begin at the radio move along the wiring harness and cut cable ties as necessary to free the cable Note the routing of the cable and location of the cable ties to aid in reinstallation The lead in cable should be freed up to the antenna base 22 Remove the antenna mast swivel and seal 23 Remove the rubber plug from the an tenna base Remove the antenna base mounting scr
57. d band AM FM or WX will be displayed on band choice Note The last station heard on each band will be stored in memory When switching back to that band it will automatically return SEEK Press SEEK V A 3 to automatically search for the next higher or lower listenable station and stay there It will find another station and stay there It will find another station each time that you press the button Manual Tuning Press and hold TUNE A 4 but ton to increase frequency Release as desired frequency is approached Press TUNE V 4 to de crease frequency Push buttons Press one of the five push buttons 5 to recall a preset station Use the following pro cedure to setup push buttons e Locate a favorite station by using SEEK V A 3 or the TUNE V A 4 buttons e Press SET 6 push button The station fre quency will flash 5 seconds or until set e Press the push button that you want to estab lish for that station e The radio will now return to that frequency each time that button is pressed BAL OFAD TRE BAS BAND 1 2 3 4 tL COo Ca Lo Vi SEEK A RCL SET Design and Function LPROG4 W3003394 Note A total of fifteen stations can be preset 5 AM 5 FM and 5 WX SET Press the SET 6 button to set a stations frequency Clock If time of day is not on the display press RCL 7 e Press and hold SET 6 button and at the same time press and hold TUNE
58. de mirror mounting arm 17 W3000663 Remove the right side cowl panel by removing the bolts inside the door jamb and around the cowl panel A N W3000670 Antenna Lead In Cable Multiplexer Type Replacement 18 Remove the right mirror backing screw covers Remove the 2 mounting screws remove the backing and the bottom channel molding 19 Remove 4 torx bolts from the step on the left side of the cab remove the step 20 Remove the upper left fairing by re moving the 4 torx bolts 21 Remove 5 torx bolts from the step side of the left quarter fender section in the lower door frame and 2 bolts from the step bracket Remove the quarter fender fairing section 22 W3000664 Remove 3 screws from the left side drip moulding and remove the mould ing 121 Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Multiplexer Type Replacement 23 25 W3003376 Remove the left mirror backing screw 143000665 covers Remove the 2 mounting screws remove the backing and the Remove 3 torx bolts from the bottom bottom channel molding of the left side mirror mounting arm 24 W3000671 Remove the left side cowl panel by re moving the bolts inside the door jamb and around the cowl panel 122 Group 39 Delco Audio System Troubleshooting 1 Panel tabs 2 Panel torx bolts Remove the CB tray by loosening the 2 bolts and
59. e Volvo VN series truck e Fixed Mast Offer excellent overall performance currently available The antenna is grounded at the base to the metal roof of the cab by the mounting bracket 34 Design and Function W3003140 The fixed mast antenna is standard on the VNM VNL and VNL 420 These vehicles can also be equipped with the multiplexer antenna system as an option Group 39 Delco Audio System Troubleshooting Design and Function e Ribbon The ribbon antenna is made from conductor insulated wire with each conductor being precisely tuned to a desired frequency The shortest conductor is tuned to the Weather band the middle length conductor is tuned to the FM band and the longest conductor is tuned to the AM band The rib bon antenna is located between the headliner and the SMC roof panel in the area immediately above the windshield The metal antenna base is grounded to the cab with a steel rivet or screw The ribbon antenna should be secured with vinyl tape to the SMC roof at least 0 1 m 4 in away from any metal objects that may tend to de tune the antenna W3003272 The ribbon antenna is standard on the VNL 610 The VNL 610 can also be equipped with the multi plexed antenna system as an option 35 Group 39 Delco Audio System Troubleshooting Multiplexer A modification of the fixed mast de sign for operation of CB radio cellular phone and stereo receiver The multiplexer antenna syste
60. e antenna system In a high frequency AC circuit the current migrates closer to and travels most efficiently near the outside surface of the conductor This is called the skin effect Because of the skin effect the better ground in the audio system is one with a larger conductive surface area This is why a braided ground strap is used where grounds do not resolve the condition such as at the base ofa power antenna mast If installing a braided ground does not resolve the condition reconnect the original ground 65 Group 39 Delco Audio System Troubleshooting Troubleshooting Conductive Shielding Tape Aluminum Tape P N 176005 This tape is used in the audio system to create a shield around a wiring harness in the vehicle or a component in the vehicle This tape will only suppress RFI conditions The tape must also be grounded using a braided ground strap to obtain optimum results see Braided Grounds page 65 Nickel Tape P N 176006 The purpose of this tape is to shield or suppress wiring harnesses and components from EMI RFI disturbances that affect the electrical functions in the vehicle The nickel tape is better able to shield magnetic interferences than alu minum tape However the nickel tape is very expensive compared to the aluminum tape 1 Conductive shielding tape 1 Conductive shielding tape 2 Antenna coaxial lead 2 Connect braided ground strap to a good chassis 3 In line connector ground 4 Connect ground strap
61. e as it was re moved Secure as necessary 6 Connect the lead in cable to the radio Turn on the radio and check for proper reception Start the vehicle and turn on all accessories Check for noise en try into radio If noise is present reroute the lead in cable away from electrically noisy components See Noise page 59 7 Install the radio The radio should click into position 96 N lt Sr ZA 1 Lower edge of dash 2 Nut at the radio mounting bracket Install the nut on rear of the radio mounting bracket Access the nut from under the dash Torque to 1 4 0 2 Nm 12 4 1 8 in Ib 9 Install the right side right door HVAC duct Install the right upper dash with 3 mounting screws and 1 mounting bolt in the speaker well Oh X ES WEE Antenna Lead In Cable Fixed Mast Day Cab Replacement EN 2 e 7 a gt z D ZN 25 5 15 e W3000675 1 4 0 2 Nm 12 4 1 8 Ib W8001180 Group 39 Delco Audio System Troubleshooting 11 Connect the wiring connector and in stall the right dash speaker and the grill Pull the right side floor mat back and insert the lower right dash panel onto the weld studs Install the 7 torx screws in the top of the panel Pull the mat back at the accelerator pedal and insert the lower center dash panel onto the weld studs Install the 4 torx screws in the top of the panel Torque
62. e center dash panel 12 W8001165 Pull the floor mat back and remove the plastic nuts Remove the lower right and center dash panels 93 Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Fixed Mast Type Day Cab Replacement 13 16 4 aS N CHA lt CAA WER lt lt AS ep ZN 25 5 15 e ZN aS y ZA 4 w3000675 ee 1 Lower edge of dash 2 Nut at radio mounting bracket Remove the right dash speaker grill Remove the speaker mounting screws Disconnect the wiring connector and Remove the nut from the rear of the remove the speaker radio mounting bracket Access the nut from under the dash 17 W3002355 Premium radio removal tools Volvo P N 3949548 left 3949549 right W8001180 Remove from the right upper dash panel 3 mounting screws and 1 mounting bolt in the speaker well Re move the dash panel from the vehicle 15 Remove the right side right door HVAC duct W3000702 Basic radio removal tools Volvo P N 176000 Insert the radio removal tool into the release holes on the radio face until the tools locks in place With the tools inserted pull on the tools to slide the radio out of the dash 94 Group 39 Delco Audio System Troubleshooting W3000674 Disconnect the antenna lead in cable from the back of the radio 19 W3003140 Remove the antenna lead in cable Begin at t
63. e compartment wall the torx bolts attaching the subwoofer must be removed To access these bolts use the trim pad remover Kent Moore P N J 38778 to release the plastic clips holding the carpet trim to the bunk support J 38778 W3002444 Pull the carpet trim back enough to slide the torx bit strap tool Kent Moore P N J 43144 onto one of the subwoofer s torx bolts The nut on the J 43144 bolt may have to be turned to allow alignment of the tool and bolt head Group 39 Delco Audio System Troubleshooting 4 Using the torx tool to hold the bolts in place remove the 4 nuts on the sub woofer Due to the tight fit of the trim panel a long screwdriver may be needed to release the tool from the lower bolts 5 Remove the subwoofer from the lug gage compartment Stereo Amplifier Replacement Installation 1 Install the subwoofer onto the bunk J 43144 support with the 4 mounting bolts Us 3 5 5 Nm ing the torx bit strap tool Kent Moore 31 4 5 in lb P N J 43144 hold each of the 4 mounting bolts in place while tighten ing the mounting nut Torque each mounting nut to 3 5 5 Nm 31 4 5 in Ib A long screwdriver may be needed to remove the torx bit strap tool from the lower bolt heads 2 Reinstall the plastic clips to the carpet trim 3 Plug in the connector to the sub woofer Replace wire ties Check operation of the subwoofer 83 Group 39 Delco Audio System Troubleshooting S
64. e ground less than 1 9 If not correct check damage incorrect truck wiring and take appropriate corrective action e Check speaker inputs from the stereo receiver Ignition key must be in ON or ACC position Back probe the ampli fier connector with a multimeter Kent Moore J39200 at the following measuring points Measuring Points Expected Value Pin E2 amp Pin AC voltage changing pro portionately with volume Pin E1 amp Pin F1 AC voltage changing pro portionately with volume Pin EA Pin E5 AC voltage changing pro portionately with volume Pin EG Pin E7 AC voltage changing pro portionately with volume If not correct check the stereo receiver outputs or wiring harness If all are correct replace the amplifier 7See Harness Connectors page 52 54 Group 39 Delco Audio System Troubleshooting e Check speaker outputs from the amplifier Ignition key must be in ON or ACC position Back probe the amplifier connector with a multimeter Kent Moore J39200 at the following measuring points Measuring Points Expected Value Pin E13 Pin E14 AC voltage changing pro portionately with volume Pin E15 Pin E16 AC voltage changing pro portionately with volume Pin F2 Pin AC voltage changing pro portionately with volume Pin E2 Pin AC voltage changing pro portionately with volume Pin F4 Pin F5 AC voltage changing
65. e materials unless the geometry is correct for absorption If so then the wave is converted into electrical potential The energy radiated relates to the amount of energy in the circuit and the geometry 10 Design and Function Group 39 Delco Audio System Troubleshooting If conditions are correct the RF wave will be absorbed into the system and induce stray currents internally within the system RFI has the capability to cause distur bances over longer distance because of the probability of susceptible devices being highly sensitive Therefore RFI can be very difficult to combat in some cases so good diagnostic practices are absolutely required Some possible vehicle sources of interference e Charging system e Solenoids e Motors e Engine electronics e 2 way radios e Citizen band CB radios e Cellular phones e Satellite Communication systems e After market electrical devices Troubleshooting Consideration When troubleshooting radio reception problems consider problems associated with radio signals Do not attempt to troubleshoot radio problems e inside buildings steel and concrete structures are worst e area with reflected signals see Multipath page 9 e close to areas with known electrical interference such as near high tension power lines e with electrical storms in the area To minimize flutter tune to radio stations with a strong signal while troubleshooting Fore more radio rece
66. e right side drip molding with 3 screws Torque the top 2 screws to Install the right side cowl panel using 24 4 Nm 1 2 0 2 Nm 10 6 1 8 in Ib and bolts on the outside and inside of the 18 3 ft lb the bottom screw to 0 5 Nm 26 W3000670 door jamb Start all bolts and align the 4 in Ib cowl before tightening Torque to 24 4 18 ft lb 17 14 Install 3 torx bolts in the lower right side mirror mounting arm 15 Install the right mirror backing together with the bottom channel Install the right side quarter fender section Start all bolts but do not tighten until after aligning Torque to 24 4 18 3 ft lb W3000663 1 2 0 2 Nm 10 6 1 8 in Ib 3 0 5 Nm 26 4 16 ws000661 24 4Nm 18 3 ft lb 127 Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Multiplexer Type Replacement 18 20 W3000662 Install the tank fairing Start all bolts 24 4Nm and align the fairing before tightening 18 3 ft lb Torque to 24 4 Nm 18 3 ft lb 19 W3000671 Install the left side cowl panel using 24 4Nm bolts on the outside and inside of the 18 3 ft lb door jamb Start all bolts and align the CJ cowl before tightening Torque to 24 4 Nm 18 3 ft lb 7 gt TN SS Install the right step Start all 4 bolts 12 1Nm and align the step before tightening 9 0 7 ft lb Torque to 1
67. ection of the diagnostic tape for the purpose of checking the cassette tape motor speed This portion of the diagnostic tape can be used to verify or resolve problems when a customer complains that the audio from the cassette tape sounds abnormal In some cases improper tape motor speed can cause abnormalities If the time taken for this test is between 1 minute and 56 seconds to 2 minutes and 1 second the tape motor speed is within tolerance 73 74 Group 39 Delco Audio System Troubleshooting Basic Radio Replacement Service Procedures AP DANGER PERSONAL INJURY HAZARD Before working on a vehicle set the parking brakes place the transmission in neutral and block the wheels Failure to do so can result in unexpected vehicle movement and can cause serious personal injury or death Possible damage to electronic components Turn the vehicle ignition switch OFF before disconnecting or connecting any electrical components Failure to de energize circuits may result in electronic equip ws001131 ment damage Remove the 7 torx screws from the lower right dash panel Remove the 4 screws from the center dash panel Basic Radio Replacement g Note This procedure applies only to the basic in dash radio For service information on the premium radio refer 4 to Premium Radio Replacement page 78 Before beginning this procedure disconnect any ground cables connected to the battery such as en gine ECU s
68. ections do not eliminate the noise try reversing the filter polarity and grounding the capacitor lead 68 Group 39 Delco Audio System Troubleshooting Switch Pop Suppression Direct switch activated device 12V ili 2 1 Switch 2 Load C1 C2 0 47 F capacitor P N 176007 O a A O PD and the component Diagnostic Test Kit Install 0 47 F capacitor C1 as shown above Troubleshooting Relay activated device 12V 12V 2 3 Relay Coil Activator switch Switch Load OO Determine which switch is causing a pop when activated Determine if the component being activated is direct switch activated or relay activated Check for switch pop If pop is still present install a second capacitor C2 as shown above Check for switch pop If pop still present install a third capacitor C3 as shown above Check for switch pop If pop still present install a feed through capacitor P N 176009 between the switch The Delco Audio System Diagnostic Kit Kent Moore J39916A can be used to diagnose noise complaints See Diagnostic Test Kit page 72 69 Group 39 Delco Audio System Troubleshooting Troubleshooting Antenna Before beginning antenna reception troubleshooting see Troubleshooting Consideration page 11 No AM Signal Weak FM Signal Usually symptoms of a broken center conductor of a lead in cable will result in no AM signal and weak F
69. egin testing procedures at minimum volume working up to an appropriate level Each signal will be played for five minutes starting with the low frequency tone Use the fade and balance controls to evaluate the speakers For example when the test signal begins fade full front and check the speaker response of the right and left speakers with the balance control Then fade full rear and check the rear speakers in the same manner There should be enough time to check all speakers with each signal If the signal ends and the test is not completed simply replay the necessary signal Note Always compare the front speakers to front and rear speakers to rear Don t compare the front speaker to rear speaker because they could be different speakers or their mounting environment could cause them to sound different The three basic tones used to test and evaluate base level speakers or other complex speaker systems are a bass 50 Hz sine tone a mid 500 Hz warble tone and a tweeter 9 000 Hz spectral tone The combination tone is a blend of the above three tones Bass Speaker Test The 50 Hz tone is used to evaluate the bass response of an audio system This tone is also helpful in evaluating audio systems witch have separate subwoofer amplifiers and speakers Mid Range Speaker Test The 500 Hz warble tone is used for the evaluation of range speaker response This tone is qualified as a warble tone because it has different audio characteri
70. ehicles using the multi plexer antenna system have similar kits under different part numbers 133 Group 39 Delco Audio System Troubleshooting 1 See Antenna Lead In Cable Multi plexer Type Replacement page 117 for instructions on how to remove the affected cable Only remove the cable on the side to be repaired 2 Measure 0 61 m 24 in from the mul tiplexer box and cut the affected antenna cable 3 Strip the end of the 0 61 m 24 in ca ble remaining on the multiplexer box 4 0161 32 MIN 1 4 11 16 W3002927 Trim the cable as shown Avoid nicking the center conductor or the outer braid Twist the outer braid in a clock wise direction in such a manner that at least 0 8 mm 1 82 in of the inner dielectric is bared stray or loose braid may cause shorts 2 1 8 3 16 W3002928 Hold the connector by the knurl pro vided Twist the connector in a clockwise direction until 3 2 mm 1 8 in to 4 8 mm 3 16 in of the center conductor protrudes from the center pin contact 134 Antenna Lead In Cable Multiplexer Type Repair TRIM CENTER CONDUCTOR CRIMP W PLIERS W3002929 Crimp the nose of the center pin con tact with a pair of pliers Then trim away any excess center conductor 7 Install the in line splice connector and the new 3 m 10 ft cable assembly Install the repaired cable assembly See Antenna Lead In Cable Multi plexer Type Replacement page 117
71. elco Audio System Troubleshooting Troubleshooting Troubleshooting Stereo Receiver Theftlock 2 LARM VOL MN TUNE SEEK 6 5 1 3 If the radio is in the Secure mode and the battery To unlock a LOCKED radio when the code is not power is lost the radio will not operate LOCKED will available appear on the display when the radio PWR button is pushed or when the ignition is turned on To obtain an unlock code for a LOCKED radio when the entered code is not available contact the local Volvo Dis To unlock a LOCKED radio trict Service Manager or call technical support at 1 800 52 VOLVO Note Pause no more than 15 seconds between the steps 1 Press MN 5 The display will show 0000 2 Press MN 5 as many times as needed to make the last digits agree with the secret code 3 Press HR 6 as many times as needed to make the first digits agree with the secret code 4 Confirm that the code on the display matches the code you have chosen 5 Press BAND 1 The display will show SECURE in dicating that the radio is operating and the THEFTLOCK is active Note If the display shows LOCKED the incorrect code was entered Repeat steps 1 5 If the wrong code is entered 8 times InoP will appear the display You will have to wait an hour with the ignition ON before you can try again When you try again you will only have three more chances 8 tries per chance to enter the correct code
72. em Troubleshooting Noise RFI Questionnaire Troubleshooting To begin diagnosing RFI conditions it is important to understand the nature of the condition and the elements that may be involved The following questionnaire will help determine vital pieces of information for the diagnostic process Question Yes No Is the vehicle equipped with any non factory installed electronics This includes radar detectors scanners and hand held communications devices If the condition occurs with a non factory installed radio have the radio installation guidelines been followed If the concern is with the entertainment radio is the tape or CD affected Identify when the condition occurs Ignition key in OFF position e Ignition key in ACC position e Ignition key in ON position engine running e Engine running AM or FM band e What frequencies are affected Is the condition on station or between stations Does condition occur with volume turned down Does condition vary with volume 15 condition RPM related Does condition occur when switching an accessory on or off Check antenna and lead in cable Does condition persist Further test for condition at low volume with antenna disconnected Does condition persist If the condition is related to a fleet vehicle answer the following e W
73. ent More J39200 check the resistance value of the speaker The specified resistance value should be printed on the speaker generally 2 4 6 8 or 10 ohms The speaker may be tested with a 1 5 volt flashlight battery by connecting one speaker terminal to the battery negative post and momentarily touching the other speaker terminal to the positive post The speaker should pro duce a pop when connected If the speaker contains a capacitor it will only pop once Do not leave the battery connected With the speaker removed from its mounting location see page 33 and wiring harness connected the following checks can be performed 58 With a multimeter Kent Moore J39200 check the AC voltage at the A and B speaker terminals A small AC volt age should be present with the stereo receiver volume low and increase proportionately with volume increase If AC voltage is correct replace the speaker If no AC voltage is present check the wiring and the stereo receiver outputs Speakers Rattle Isolate the problem speaker Inspect for loose or damaged speaker or grill The Delco Audio System Diagnostic Kit Kent Moore J39916 A can be used to diagnose speaker buzz or rattle A test CD and cassette tape will provide the technician with test tones for speaker testing The stereo receiver must be equipped with a CD player or cassette tape player to use this test kit See Diagnostic Test Kit page 72 Group 39 Delco Audio Syst
74. ereo receiver If the above conditions are not correct check the CD changer harness or stereo outputs If the above conditions are correct replace the CD changer CD Changer Initializes But Does Not Produce Sound e Left and or right audio output s not operating Back probe the CD changer connector with a multimeter Kent Moore J39200 while a CD is playing at the following measuring points Measuring points Expected value Pin 1 Pin3 AC voltage varies with music intensity Pin 2 Pin3 AC voltage varies with music intensity If the above conditions are not correct replace the CD changer If the above conditions are correct check the CD changer harness and inputs to stereo receiver If inputs to the stereo receiver are correct the stereo receiver may be at fault See Stereo Receiver page 37 Diagnostic Kit test The Delco Audio System Kit Kent Moore J39916A can be used to diagnose CD changer complaints See Diagnostic Test Kit page 72 Harness Connectors 47 51 Group 39 Delco Audio System Troubleshooting Amplifier Harness Connectors Troubleshooting Amplifier Harness To Amplifier Amplifier Harness To Stereo Receiver Cavity Circuit Function 1 499RA RHS Front Input E2 499LA LHS Front Input E3 499LB LHS Front Input E4 49
75. errent feature e Sleep Feature e Infrared remote control e Cassette Tape or CD Player The VN 770 and VN 660 are also available with optional e Six disc CD Changer e Premium speaker system including a 8 channel am plifier and a subwoofer Theft Deterrent Feature THEFTLOCK is designed to discourage theft of your ra dio It works by using a secret code that you select to disable all radio functions whenever the radio is discon nected from the vehicle or battery power is removed The THEFTLOCK feature of the radio may be used or ignored If ignored the audio system plays normally and the radio is not protected by the feature If THEFTLOCK is activated your radio will not operate if stolen Whether THEFTLOCK has been activated or not a red light on the radio will flash when the ignition is OFF This light is intended to deter thieves For THEFTLOCK operating instructions see Theftlock page 37 Sleep Feature The premium AM FM radio receives a battery feed and can be turned on when the ignition is OFF by pushing in the POWER knob With the ignition OFF the radio will play for one hour and automatically turn off Note On amplified systems when the sleep feature is in use only the two upper bunk speakers can be heard In order to play the stereo through all speakers the ignition switch must be turned on Applies only the VN 770 s premium speaker package Infrared Remote Control W3003536 The
76. ew a ground terminal or preferably a ground stud Additional Cautions For a complete list of precautions when working with electrical circuits see Electrical General manual Volvo service publication number PV776 TSP28379 1 Unauthorized Repair The warranty may not apply if the product is worked on by an unauthorized person W3000572 General Group 39 Delco Audio System Troubleshooting Special Equipment Tools Tools The following items can be ordered from Kent Moore 1 800 328 6657 Volvo Parts dealer Kent Moore J39200 digital multimeter Kent Moore several models electro static discharge strap Kent Moore J39916A diagnostic audio kit Volvo P N 3949548 left P N 3949549 right premium radio removal tools W3003391 Kent Moore J38778 trim pad removal tool Kent Moore J43144 torx bit strap tool Volvo P N 176000 basic radio removal tools Group 39 Delco Audio System Troubleshooting Design and Function Radio Signals The radio signal is sent from a broadcast station and this signal is then received by an antenna The strength of the signal depends on the following e The power output wattage of the broadcasting sta tion e The location of the receiver relative to the broadcast tower e Obstacles between the tower and the receiver e Atmospheric conditions e What band AM or FM the station is broadcasting e of antenna and the grounding ba
77. ew Remove the antenna base and lead in cable through the cab roof hole and remove from the vehicle Installation 1 Clean the roof mounting hole if neces 0 5 Nm sary Install the replacement antenna 25 5 in lb cable through the roof mounting hole Properly position the mounting clamp and the antenna base seal Install the mounting screw Torque to 3 0 5 Nm 25 5 in lb 104 W3003271 Check the continuity between the an J39200 tenna base and the cab use the multimeter 39200 The antenna must be properly grounded to operate cor rectly The readings should be less than 0 2 ohms Note Zero the meter to avoid false readings Install the antenna mast swivel with 1 5 seal Torque to 1 5 0 5 Nm 12 5 12 in lb 3 4 Temporarily connect the lead in cable to the radio and check for proper re ception Group 39 Delco Audio System Troubleshooting 5 Disconnect the lead in cable from the radio Install the antenna lead in cable along the same route as it was re moved Secure as necessary 6 Connect the lead in cable to the radio Turn on the radio and check for proper reception Start the vehicle and turn on all accessories Check for noise en try into radio If noise is present reroute the lead in cable away from electrically noisy components See Noise page 59 7 Install the radio The radio should click into position A Da N
78. example if a coaxial speaker is not functioning properly a direct comparison of the right to left speaker or vice versa can deter mine if the tweeter or woofer in the speaker assembly is inoperative Also when using the combination tone comparative AC voltage measurements can be made on the speaker terminals provided the fade and balance controls are in the detent position With these voltage measurements a de termination can be made in the diagnosis of speaker or amplifier If the amplifier system of the vehicle is operating normally the AC voltages should be very close or the same in value Speaker Grill Rattle Test This portion of the CD can be used to diagnose speaker and grill rattles The first test is two variable frequency tones played back to back which can help you find or verify a speaker rattle or buzz Tone two is also a sweep but frequency change is at much slower rate This can be used the repair of a speaker rattle or buzz If the problem has already been isolated the fade and balance controls can be set to the proper location and the test tones can be played in the specific problem area Noise Diagnostic This portion can be used for noise diagnostics such as alternator whine switch pops etc This portion of the diagnostic CD cassette tape may be used in conjunction with the audio diagnostic section in the service manual provided with the test kit Motor Speed There is a 2 minute time period marked in a s
79. for installation instructions Feedback One of our objectives is that workshop personnel should have access to correct and appropriate service manuals where it concerns fault tracing repairs and maintenance of Volvo trucks In order to maintain the high standards of our literature your opinions and experience when using this manual would be greatly appreciated If you have any comments or suggestions make a copy of this page write down your comments and send them to us either via telefax or mailing directly to the address listed below To From Volvo Trucks North America Inc 0 Dept 516 Service Publications 7825 National Service Road 26115 eeezade rab bh edeheuete den a debs der vahlich debi ctlicedesseeh Panes Greensboro NC 27402 6115 0 USA Fax 336 393 3170 Comments proposals BATTERY 12 VOLT IGNITION 12 VOLT ACCESSORY 12 VOLT TO DIMMER CONTROL TO LIGHT 45 CONTROL 490 492 141 490 L10 STEREO RECIEVER 498LA 498LB 498RA 498RB 490 490 490 499LA 499LB 499RA 499RB 498LA 498LB 498RA 498RB Lob tht E d E gaff kel kd ke E E4 UPPER LEFT UPPER RIGHT REAR SPKRIRR REAR SPKRIRR AMPLIFIER B A B SS 85 4 KH Leem CN LEFT DOOR RIGHT DOOR LEFT DASH RIGHT DASH LOWER LEFT LOWER RIGHT SUBWOOFER SPKRIRRI SPEAKERIFRT SPEAKERIFRT SPEAK
80. he dash panel from the vehicle 18 Remove the right side right door HVAC duct 19 S V W3000675 1 Lower edge of dash 2 Nut at radio mounting bracket Remove the nut from the rear of the radio mounting bracket Access the nut from under the dash 112 Antenna Lead In Cable Ribbon Type Replacement W3002355 Premium radio removal tools Volvo P N 3949548 left 3949548 right W3000702 Basic radio removal tools Volvo P N 176000 Insert the radio removal tool into the release holes on the radio face until the tools locks in place With the tools inserted pull on the tools to slide the radio out of the dash 21 W3000674 Disconnect the antenna lead in cable from the back of the radio Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Ribbon Type Replacement 22 5 Install the radio The radio should click into position 6 2 e Se YA 4 2 24 AN SS LR Ia ee WN Hin FR N Ni ei PALL s2 NAN 1 01022224 Ce SS AWN 1 1 SZ aN W3003272 W3000675 Remove the antenna lead in cable 1 Lower edge of dash Begin at the radio move along the 2 Nut at the radio mounting bracket wiring harness and cut cable ties as necessary to free the cable Note the Install the nut on rear of the radio 1 4 0 2 Nm routing of the cable and location of the mounting bracket Access the nut from 12 4 1 8 in
81. he default band When a frequency of sufficient strength is found the radio will play for 5 seconds and then continue scanning for next station To stop the scanning press SCAN again P SCAN Press 9 to scan the presets on the default band To stop the scanning press P SCAN again Group 39 Delco Audio System Troubleshooting Adjusting the Radio 18 AUDIO To adjust Balance Fade Bass Treble DIM and SEEK Sensitivity press the AUDIO button 10 until the feature appears on the display Balance Rotate the VOL knob 1 to move the sound to the left or right speakers Fade Rotate the VOL knob to move the sound to the front or rear speakers TREBLE Rotate the VOL knob to adjust treble sound BASS Rotate the VOL knob to adjust the bass sound DIM Rotate the VOL knob to adjust the bright ness of the radio display The brightness can be only be adjusted when the vehicle lights are on SEEK To set the radio to seek and find station with a weak signal press the AUDIO button un til SEEK 2 appears To set the radio to seek only strong signals press the AUDIO button un til 2 appears Press the AUDIO button one more time to set all ad justments and return to the default display Design and Function Group 39 Delco Audio System Troubleshooting 4 5 6 ull LARM VOL MN JUNE SEEK A 7 Cassette Tape Player To Play a Cassette Tape 1 Turn the radi
82. he housing align ing the stud on the rear of the radio with the mounting bracket Guide the wiring from between the radio and the bracket making certain that the an tenna cable and electrical connection do not get caught in the bracket Push in the radio until it locks into the secu rity clips r W3002404 Install the nut on the rear mounting 1 stud of the radio Torque the nut to 1 4 1 0 2 Nm 12 2 in Ib If there are other ground cables connected to the bat tery such as engine ECU satellite system etc connect the battery ground cable first then connect those grounds Electronic modules may be damaged when additional grounds are connected disconnected without the main battery ground connected Always reconnect the main battery ground first Connect the main negative battery ca ble Check operation of the radio 80 Premium Radio Replacement Pull the right side floor mat back and insert the lower right dash panel onto the weld studs Install the 7 torx screws in the top of the panel Pull the mat back at the accelerator pedal and insert the lower center dash panel onto the weld studs Install the 4 torx screws in the top of the panel Torque to 3 5 0 5 Nm 31 4 5 in lb _ Pull the floor mat back and install the plastic nuts in the lower right dash panel and the panel under the center ae W8001166 of the dash 7 Install the right fron
83. he power supply or the ground of the amplifier only the upper two rear bunk speakers will play e Check for AC voltage at suspect speakers see Speakers page 58 e Check speaker outputs from the stereo receiver Ignition key must be in ON or ACC position Back probe the wiring harness connector to the stereo receiver Measuring Points Expected Value Pin 1 Pin 13 AC voltage changing pro portionately with volume Pin 2 Pin 12 AC voltage changing pro portionately with volume Pin 8 Pin 5 AC voltage changing pro portionately with volume Pin 6 Pin 7 AC voltage changing pro portionately with volume If correct check speakers or wiring harness After performing the above test if no faults were found replace the stereo receiver Test operation after replacement See Harness Connectors page 39 41 Group 39 Delco Audio System Troubleshooting Troubleshooting No Stereo Receiver Display Illumination The stereo receiver display should illuminate when the ignition key is in the ON or ACC position Additionally the premium stereo receiver display should illuminate in the sleep mode e Check for power supply Ignition key must be in ON or ACC position Back probe the wiring harness connector to the stereo receiver Measuring Points Expected Value Pin 3 Alternate ground B If not correct check for blown fuse or damage incorrect truck wiring and take a
84. he radio move along the wiring harness and cut cables ties as necessary to free the cable Note the routing of the cable and location of the cables ties to aid in reinstallation The lead in cable should be freed up to the antenna base Antenna Lead In Cable Fixed Mast Type Day Cab Replacement 20 Remove the antenna mast swivel and seal 21 Remove the rubber plug from the an tenna base Remove the antenna base mounting screw Remove the antenna base and lead in cable through the cab roof hole and remove from the vehicle Installation 1 Clean the roof mounting hole if neces 3 0 5Nm sary Install the replacement antenna 25 5 in lb cable through the roof mounting hole Properly position the mounting clamp and the antenna base seal Install the mounting screw Torque to 3 0 5 Nm 25 5 in lb W3003271 J39200 Check the continuity between the an tenna base and the cab use the multimeter J39200 The antenna must be properly grounded to operate cor rectly The readings should be less than 0 2 ohms Note Zero the meter to avoid false readings 95 Group 39 Delco Audio System Troubleshooting Install the antenna mast swivel with 1 seal Torque to 1 5 0 5 Nm 12 5 1 10 3 4 Temporarily connect the lead in cable to the radio and check for proper re ception 5 Disconnect the lead in cable from the radio Install the antenna lead in cable along the same rout
85. ho installed the radio s Were the installation guidelines followed 15 this the only vehicle which demonstrates this condition Do similar vehicles have different antennas Are the antennas mounted in the same location 59 Group 39 Delco Audio System Troubleshooting Troubleshooting Front Way Noise Front way noise is any noise that enters the audio system through the antenna system Some electrical noise is always present in the signals reaching the antenna but the antenna system cannot be filtered or suppressed To diag nose front way noise test if the antenna system meets specifications or if there is an electrical noise emitter present in the vehicle Possible Causes e Poor grounding of the following Antenna Receiver Some electrical components Body panels e Defective or marginal components relays switches solenoids motors etc e Antenna lead in too close to electrical or electronic components e Opens shorts or electrical leaks in the ignition system Troubleshooting Hints e f noise is present with the radio on but goes away when the CD or cassette tape player is it is likely that front way noise is the problem e Confirm that the antenna system is the source of noise with the test antenna See Test Antenna page 71 e Always verify grounding first If more than one component interferes poor grounding probably exists 1 60 Check the
86. hooting Troubleshooting Wiring Harness W3003443 Amplifier Connectors Upper harness Connectors Lower harness Connectors The amplifier harness is a two piece harness The harness runs from 2 connectors at the stereo receiver to 2 tors behind the left kick panel The upper harness runs from the 2 connectors behind the left kick panel up the left A pillar across the cab under the lower headliner to the amplifier and a connector for the rear speakers 53 Group 39 Delco Audio System Troubleshooting Troubleshooting No Amplifier Operation e Confirm operation of stereo receiver The two upper rear speakers operate independently of the amplifier If the upper rear speaker do not operate check stereo receiver harness or speakers e Ignition key must be ON or ACC position Back probe the amplifier connector with a multimeter Kent Moore J39200 at the following measuring points Measuring Points Expected Value Pin 11 B Alternate ground PinE12 B Alternate ground If not correct check for blown fuse or damage incorrect truck wiring and take appropriate corrective action e Check for proper ground Ignition key must be in OFF position Back probe the amplifier connector with a multi meter Kent Moore J39200 at the following measuring points Measuring Points Expected Value Pin E8 Alternate ground less than 1 2 Pin E9 Alternat
87. io System Troubleshooting 5 Remove driver side window visor as sembly Pry off the end screw covers Remove the mounting screws Note On sleeper models without an upper bunk the step 6 and 7 may be omitted 6 Remove the sleeper right overhead storage cabinet Disconnect the 12 volt power outlet connector Remove the lamp wiring cover screws Remove the cabinet mounting bolts Disconnect the lamp wiring connector Remove the cabinet from the vehicle 7 Remove the sleeper left overhead storage cabinet Remove the lamp wiring cover screws Remove the cabinet mounting bolts Disconnect the lamp wiring connector Remove the cabinet from the vehicle 8 Remove the sleeper curtain rail as sembly Note The curtains do not need to be removed from the rail 9 Remove the bezels for the front over head roof storage pockets Note Use caution not to break the bezel mounting post 86 Antenna Mast Ribbon Type Replacement 10 W8001428 Remove the front curtain rail assem bly Use a wide blade screw driver to carefully pry the rail out of one side then the other side on each retaining clip After all retaining clips are re leased remove the front curtain rail assembly from the vehicle Note Use caution not to deform the rail assembly 11 W3003095 Curtain rail or trim washer Plastic spacer Cab metal Headliner Screw E Go Check the retaining clips used to at tach
88. king fasteners 22 W3003260 1 Plastic rivets day cab vehicles only 2 Molding clip 3 Grab handle bolt cover Install the A pillar trims Secure with the molding clips 23 Install the grab handles Torque to 24 24 4Nm 4 18 3 ft lb Replace the bolt 18 3 ft lb cover trim 24 Install the door seals 107 Group 39 Delco Audio System Troubleshooting 25 Install the front curtain rail assembly Position the rail and snap into the re taining clips Note Use caution not to deform the rail assembly 26 Install the sleeper curtain rail assem bly Torque to 3 0 5 Nm 25 5 in lb 27 Install the driver side window visor as sembly Torque to 5 0 8 Nm 45 7 in lb 28 Install the front right overhead storage cabinet Install the 4 mounting screws with their rubber washer to the carrier rail Torque to 2 0 3 Nm 17 in lb Install the 2 screws over the windshield Torque to 3 0 5 Nm 25 5 in lb Install the mounting screw covers 29 Install the right sun visor Torque to 5 0 8 Nm 45 7 in Ib 108 2 0 3Nm 17 16 3 0 5 Nm 25 5 in lb 8 Nm 7 in lb I It 4 Antenna Lead In Cable Ribbon Type Replacement 30 Install the front overhead storage cabi net together with the sun visor Install the 4 mounting screws with their rub ber washer to the carrier rail Torque to 2 0 3 Nm 17 in lb Install the 6 screw
89. l on other VN series vehicles Determine which antenna system is used be fore beginning repairs Note Do not confuse a CB antenna mast with a multi plexer antenna mast see Antenna Types page 34 W3003138 Cellular phone antenna cable Radio antenna cable Left side antenna CB radio antenna cable Right side antenna CB stereo receiver antenna Cellular phone antenna NOOR WD 117 Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Multiplexer Type Replacement Removal 5 1 Make certain the vehicles ignition is OFF before beginning this procedure 2 Remove the upper grab handle bolt cover from the A pillar trim Remove the 2 mounting bolts and remove the grab handle Repeat on the other side W3000648 Adjust the steering column forward and up where possible Remove the 3 torx bolts from the rear column cover and remove the cover Remove the 2 clips at the bottom of the steering column cover 4 Adjust the steering column up and back where possible Remove the front steering cover by removing the 3 ws001131 torx bolts from the cover and sliding Remove the 7 torx screws from the the rubber grommets off of the cover lower right dash panel Remove the 4 at the stalk switches screws from the center dash panel 118 Group 39 Delco Audio System Troubleshooting 7 e a CoS gt L7 W8001165 Pull the floor mat back and
90. lifier The amplifier provides better sound performance in gen eral and can be played at higher volume levels without 31 Group 39 Delco Audio System Troubleshooting Speakers All speakers operate on the same basic principle A ba sic speaker consists of a cone voice coil magnet magnetic core and two wires which connect the speaker to the receiver The speaker s permanent magnet creates a magnetic field that is radiated outward and through the voice coil that is attached to the cone As the audio signal alter nating current passes through the voice coil it creates a varying magnetic field that interacts with the magnetic field from the permanent magnet This interaction of magnetic fields forces the cone to move back and forth thus creating sound waves The speaker plus and minus or A and B signs only define a direction of motion during the conversion from electrical to mechanical energy The plus and minus do not directly relate to a voltage level By convention if a battery s positive terminal is connected to speaker terminal and battery negative is connected to speaker terminal then the speaker cone will move outward Speakers should be connected with the correct polarity to the receiver otherwise the two different speaker cones can be moving in opposite directions during the same input This will lead to less ef fective sound reproduction because the speakers are out of phase with each other
91. lifting the cover on the right rear corner Then pull the cover toward the passenger side and back to clear the tabs on the front left sides Remove the CB cable grommet and then remove the CB cable 27 Disconnect the cellular phone antenna cable from the multiplexer box 28 Disconnect the antenna cable from the radio Cut ties as necessary to free the cable W8002059 Antenna Lead In Cable Multiplexer Type Replacement 29 W3000641 When servicing or troubleshooting do not leave the cluster facedown for more than 15 minutes or dam age to the gauges may occur Gauge oil can run out the front of the gauge faces and make the gauges in accurate Adjust the steering column back where possible Remove the 2 screws at the top of the instrument cluster and lay the cluster facedown on the steering column 30 Cut cable ties to free the left antenna lead in cable from the mirror harness disconnect the antenna lead in cable from the antenna Note the routing of the cable and location of the cables ties to aid in reinstallation 123 Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Multiplexer Type Replacement 31 34 W3003375 Cut the heat shrink and cut cable ties as necessary to free the cable be tween the mirror and the heat shrink pull in the lead in cable into the cab W3003366 Cut cable ties to free the right antenna 32 lead in cable from the mirror harness di
92. m used in the Volvo VN series vehicle uses a combi nation AM FM and CB radio antenna mast The windings in the antenna are specific to this system and require no tuning Always replace the antenna mast with OEM replacement parts The use of a standard CB antenna mast will give unsatisfactory performance for CB reception and very poor or no reception on AM FM and cellular phone frequen cies The multiplexer antenna mast used in the VN series can be identified by the clear plastic covering exposing the antenna windings and a top cap with the logo Antenna Lead in Cable The antenna lead in cable carries the RF signal from the antenna to the AM FM receiver The lead in cable con sists of a center conductor insulating material and an outer grounding shield Some cables have a greater dis tance between the center conductor and outer shield so the cable acts less like a capacitor and less signal is lost on the lead in Receivers are matched or tuned to a spe cific lead in type and cable length Always use OEM replacement cables 36 Design and Function W3003138 The multiplexer antenna system is standard on the Volvo VN 660 VN 770 and optional on other VN model vehicles Cellular phone antenna cable option Radio antenna cable Left side antenna mount CB radio antenna connection Right side antenna Multiband antenna mast Cellular phone antenna ground plane Group 39 D
93. munication problem with the CDX mechanism MAGAZINE 34 No CDs No CDs loaded into the CDX magazine CDX door open if the mag CD DOOR 35 CDX Door azine has been previously initialized CDX door is open and the NO CD TBD CDX Door magazine has not been ini tialized CD Skips or Mutes e CD Changer Mounts Check for loose CD changer mounting Secure as necessary e Vibration Skip The CD player has been designed with a shock absorbing suspension much like that of a car Only under extreme operating temperatures and server shock or vibration should the music be temporarily muted The tem porary muting is considered normal and should not cause damage to the player or compact disc The player will resume normal playing when the vibration or shock subsides e Dew Point Operation Under certain cold temperature and humidity conditions moisture in the air will condense on the surrounding sur faces This most commonly occurs in the spring and fall when moisture accumulates on the windshield and body of the vehicle if it is left out at night The heart of the CD player is a laser lens assembly reading a shiny digital encoded disc If this lens or disc becomes fogged up with moisture the mechanism will have difficulty reading the disc and reproducing the music When this condition exist the player may intermittently mute This type of reaction is considered normal and will clear as soon as the CD or the player has warmed up
94. n of the auxil iary electrical components and or of their wiring harness routing e Suppress or shield the noisy harness or wire or reroute it 61 Group 39 Delco Audio System Troubleshooting Troubleshooting Back Way Noise Back way noise is noise that enters the audio system through its wiring harness Back way noise is most commonly conducted through the power or ground circuits Some interference or noise is al ways present in the power and ground circuits When the unwanted signals overcome the ability of the audio system to suppress them they become interference These noises are often heard when a particular accessory or system is operated Diagnose back way noise after eliminating front way or side way noise Possible Causes Poor grounding of the receiver measure with the antenna lead in disconnected Non suppressed electrical components Poorly routed wires Defective electrical components or defective suppression components Troubleshooting Hints 62 Determine if noise is present only if the engine is running or when certain electrical components are operat ing Removing fuses one at a time can help isolate the noise source Grounds shared between electrically noisy components and audio components can be noise sources Estab lish new grounds if necessary Switch pops are suppressed using capacitors See Switch Pop Suppression page 69 Capacitors or filter packages are most effective when installed a
95. ng page 45 3 Follow the cleaning instructions provided with the cassette cleaner 4 Press the AUDIO button until the display reads CLEAN 0 5 Rotate the VOL knob until YES appears 6 Approximately 5 seconds after YES appears the cleaning reminder will disappear and the display will return to the previously set display 20 Design and Function Group 39 Delco Audio System Troubleshooting 7 9 8 Compact Disc Player To Play a CD 1 the radio on 2 Insert a CD part way into the slot with the label side up The CD icon 1 will appear on the display and the disc will begin to play if the radio is in the CD mode Note The player will automatically pull the disc in once it has been partially inserted 3 If the radio or a cassette is played press the CD button 2 to play the CD If no CD has been loaded into the player the display will show NO CD If a CD has been loaded the display will show the track number followed by the elapsed time on the track 4 numbered push buttons 3 helps to operate the CD player conveniently e Press 7 to go to the beginning of the track being played If this button is pressed during the first 8 seconds of the track the previous track will be played e Press 3 gt to go to the next track e Press 4 lt to fast reverse e Press 6 gt gt to fast forward 5 Use the VOL knob 8 and AUDIO button 9 to ad just the sound Design and Func
96. nnect the antenna and the elec trical connector Installation 1 Make certain the vehicle ignition is OFF before beginning this procedure 2 Connect the radio electrical connector and the antenna Group 39 Delco Audio System Troubleshooting SNS J lt I SOS ll W3000675 1 Lower edge of dash 2 Nut at radio mounting bracket Slide the radio into the housing mak 1 ing sure the stud on the rear of the 1 radio is aligned with the mounting bracket Install the nut into the bracket to hold the radio in position Torque to 1 4 0 2 Nm 12 2 in lb Note When sliding the radio into posi tion make certain the antenna cable and electrical connection do not get between the radio and the radio bracket If there are other ground cables connected to the bat tery such as engine ECU satellite system etc connect the battery ground cable first then connect those grounds Electronic modules may be damaged when additional grounds are connected disconnected without the main battery ground connected Always reconnect the main battery ground first Connect the main negative battery ca ble Check operation of the radio Also check the CD changer and the fier if installed Premium Radio Replacement Pull the right side floor mat back and insert the lower right dash panel onto the weld studs Install the 7 torx screws in the top of the panel Pull the mat back at the accelerator
97. nstructions Repair Replacement As an alternative to expensive replacement Delco Elec tronics Devices may be repaired at approved service centers Call D amp B Auto Radio at 1 800 323 4813 for re pair information General Cautions Possible damage to electronic components Turn the vehicle ignition switch OFF before disconnecting or connecting any electrical components Failure to de energize circuits may result in electronic equip ment damage AP DANGER PERSONAL INJURY HAZARD Before working on a vehicle set the parking brakes place the transmission in neutral and block the wheels Failure to do so can result in unexpected vehicle movement and can cause serious personal injury or death AP DANGER On vehicles with SRS airbags Before doing any electrical repair work in the steering column discon nect the negative and positive battery cables in order to disengage the SRS Failure to do so can cause the SRS to be accidentally deployed resulting in serious personal injury Disconnect the ground terminal first General Group 39 Delco Audio System Troubleshooting Preventing Electrostatic Discharge A wrist grounding strap must be worn when working on electronic equipment such as audio components This is to prevent electrostatic discharge ESD which can damage electronic components To use the wrist strap in a vehicle attach the alligator clip to the near est electrical ground such as a metal mounting scr
98. o System Troubleshooting 37 W3003368 Install the lower left dash panel with 3 3 5 0 5 Nm mounting screws Torque to 3 5 0 5 31 4 5 in lb Nm 31 4 5 in lb Pull the floor mat back and install the plastic nut 38 Install the left grab handle Torque to 24 4Nm 24 4 Nm 18 3 ft lb 18 3 ft lb 132 Antenna Lead In Cable Multiplexer Type Replacement Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Multiplexer Type Repair Antenna Lead in Cable Multi plexer Type Repair 2 desk W3003360 1 Cell phone antenna 4 AM FM cable 2 Antenna cable 5 CB cable 3 Antenna cable A repair kit P N 3949871 is available to repair damaged multiplexer antenna lead in cables without replacing the mul tiplexer control box The repair kit contains a connector splice connector 3 m 10 foot cable assembly and door jam sealing parts When the repair is properly completed the antenna cable length will be the same as it originally was so that antenna tuning will remain correct 6 7 8 10 9 W3003359 6 Multiplexer box 10 3m 10 ft cable assembly 7 0 61 24 in cable 11 Sealing washer 8 259 1 Connector 12 Heat shrinkable cap 9 CP AD204 In line splice connector Note Each kit contains repair parts for one antenna ca ble If both antenna cables are damaged two kits are required Note The repair kit P N 3949871 is designed for Volvo VN series only Other Volvo v
99. o on 2 Insert a cassette into the cassette slot The cassette icon 1 will appear on the display and the tape will begin to play 3 If the radio or a CD playing press the tape button 2 to play the cassette If no tape is loaded into the player the display will show NO TAPE If a tape is in the player SIDE 1 or SIDE 2 will be displayed 4 six numbered push buttons 3 helps to operate the tape player conveniently e Press 7 to go to the beginning of the selec tion being played If this button is pressed during the first 8 seconds of the selection the previous selection will be played e Press 2 to reverse the direction of the tape and play the existing track in that position e Press 3 gt to go to the next selection e Press 4 444 to rewind e Press 5to turn the Dolby background noise re duction on or off e Press 6 gt gt to fast forward 5 Use the VOL knob 4 and AUDIO button 5 to ad just the sound Vd 0 Design and Function Delco Electronics RDM RPT el PSCAN SCAN 2 3 W3003404 EJECT Press the eject button 6 to eject a tape from the tape player DISPL Press the DISPL button 7 to view the time SIDE 1 or SIDE 2 Pressing DISPL more than one time allows to toggle between the displays Press DISPL and hold it until it beeps to set the default display TAPE Press the tape button 2 and hold for 2 seconds any time the radio is on to enable or dis
100. onto the weld studs Install the 4 torx screws in the top of the panel Torque to 3 5 0 5 Nm 31 4 5 in lb 114 Antenna Lead In Cable Ribbon Type Replacement 11 W8001166 Pull the floor mat back and install the plastic nuts in the lower right dash panel and the panel under the center of the dash 12 Note the location of all interlocking fasteners on the headliner to aid in in stallation Position the headliner in the cab below its mounting location Con nect the lamp assembly connectors Note Use caution not to bend the headliner to the point at which a permanent crease will show in the ma terial 13 3 4 W3003110 1 Roof plate 2 Roof panel Headlining 4 Fully engage fasteners pressing firmly Lift the headliner assembly into posi tion Use the front overhead roof storage pockets as a guide to assist in proper positioning Temporarily secure with a few interlocking fasteners Group 39 Delco Audio System Troubleshooting 14 W3003095 Curtain rail or trim washer Plastic spacer Cab metal Headliner Screw E Line up the mounting screws for the KE front curtain rail assembly Add the ny 25 lon spacers between headliner and cab screw holes Install all retaining clips that are attached with screws Torque to 0 5 Nm 25 5 in lb 0 5 Nm 5 16 15 W8001424 Place a blunt tool such as a punch in the center of the remaining re
101. oro NC USA Order number PV776 TSP109859 98 Volvo Trucks North America Inc Greensboro NC USA All rights reserved No part of this publication may be reproduced stored in retrieval system or transmitted in any forms by any means electronic me chanical photocopying recording or otherwise without the prior written permission of Volvo Trucks North America Inc Contents COPIER a 3 Selen YN SNE SEENEN 3 pruska ias nin 5 Special eisai 5 A ER E 6 Se E 6 EE ai cacti amelie Eet 10 Hee FOCENO eege heel eh 12 Basic Sound WEE 12 Sound NEE 15 E KE E 27 RE Wee E 28 nl E A A T E E T A A EET 31 E 32 LALA tae ater Tra 34 IT in E 37 ee eens 37 Gasselte Tapa Playor Ehe eh 44 ERR EE 46 E KE Ee 47 nl IT 52 EE het 58 MOSG Leger 59 FAL ct EE 70 72 Service TEE 75 Basit Radio En UE 75 Premium Radio Feelen 78 CD Changer Faeptopeguengt ebessi EN E EE 82 Stereo Amplifier Replacement 84 Antenna Mast Fixed Mast Type Replacement
102. ppropriate corrective action e Check for proper ground Ignition key must be in OFF position Back probe the wiring harness connector to the stereo receiver Measuring Points Expected Value Pin 9 Alternate ground less than 1 9 If not correct check damage incorrect truck wiring and take appropriate corrective action After performing the above test if no faults were found replace the stereo receiver There are no field replaceable lamps in the stereo receiver assembly Test operation after replacement No Stereo Receiver Face Illumination The stereo receiver face should illuminate when the headlight switch is on and also the display background light should automatically dim to reduce glare The dimmer switch should raise and lower the brightness of the face illumi nation and the display background light e Check for power supply Headlight switch must be on Back probe the wiring harness connector to the stereo re ceiver Measuring Points Expected Value Pin 4 Alternate ground B to 0 volts variable with dimmer control If not correct check for blown fuse or damage incorrect truck wiring and take appropriate corrective action 3See Harness Connectors page 39 42 Group 39 Delco Audio System Troubleshooting Troubleshooting e Check for proper ground Ignition key must be in OFF position Back probe the wiring harness connector to the stereo receiver Measuring Point
103. premium sound system is equipped with an infrared remote control The remote control will e Turn the radio on and off e Adjust volume e Select a preset station e Seek up and down e Select band FM1 FM2 or AM e Play acassette tape e Change cassette tape side e Play aCD e Select the next or previous CD track e Select the next CD Group 39 Delco Audio System Troubleshooting Operating Instructions 1 7 Design and Function Clock 12 or 24 Hour Mode 1 the ignition ON and the radio off 2 Press both the HR 2 and MN 3 buttons at the same time Hold them for 2 seconds 3 Press both buttons again and hold to switch modes The current mode will appear on the display 4 To Set the Clock 1 Turm the ignition ON and the radio off 2 Press and hold HR 2 until the correct hour ap pears on the display 3 Press and hold MN 3 until the correct minute ap pears on the display The clock is now set Alarm To Set the Alarm 1 Press the alarm button 5 and hold until an alarm icon 14 and the time at which the alarm is cur rently set appear on the display 2 Press the HR button 2 until the desired hour ap pears on the display 16 10 6 W3003403 3 Press MN button 3 until the desired minute ap pears on the display When the alarm icon and the time appears on the dis play the alarm has been set If the radio is on the alarm sounds To turn off
104. ption troubleshooting see Noise page 59 Design and Function 11 Group 39 Delco Audio System Troubleshooting Stereo Receiver Basic Sound System Weather Band e CU BAL gt FAD TRE BAS OG The basic sound system features a Delco Heavy Duty stereo receiver with weather band The basic stereo re ceiver is also available with a cassette tape player The stereo receiver is installed in the dash and receives con stant battery power for its clock and memory functions The basic stereo receiver does not have ability to detect and display error messages VOL 10 cl Note NOAA Weather Radio is a service of the Voice BAND 2 3 4 5 Co Ed 10105101 V SEEK A RCL SET fee CH CH Fee Design and Function LPROG4 1 V TUNE A W3003393 of the National Weather Service It provides continuous broadcasts of the latest weather information directly from National Weather Service offices Taped weather mes sages are repeated every four to six minutes and are routinely revised every one to three hours or more fre quently if needed Most of the stations operate 24 hours daily Group 39 Delco Audio System Troubleshooting Operating instructions 1 8 9 10 11 2 3 Radio Power Rotate the ON OFF 1 control clockwise to turn the radio on rotate CCW to turn radio off Volume Rotate VOL 1 control clockwise to in crease volume AM FM or WX Press BAND 2 switch to select desire
105. r through the cabinet access hole Connect the lamp wiring connector Install the cabi net mounting bolts Torque to 24 4 Nm 18 3 ft lb Install the lamp wiring cover screws Connect the 12 V power outlet connector 26 Install the driver side window visor as sembly Torque to 5 0 8 Nm 45 7 10 116 5 45 in lb 24 4Nm 18 3 ft lb 24 4Nm 18 3 ft lb 5 0 8 Nm 45 7 in lb Antenna Lead In Cable Ribbon Type Replacement Install the front right overhead storage cabinet Install the 4 mounting screws with their rubber washers to the car rier rail Torque to 2 0 3 Nm 17 3 10 Install the 2 screws over the windshield Torque to 3 0 5 Nm 25 5 in lb Install the mounting screw covers 28 Install the right sun visor Torque to 5 0 8 Nm 45 7 in lb 29 Install the front left overhead storage cabinet together with the sun visor In stall the 4 mounting screws with their rubber washers to the carrier rail Torque to 2 0 3 Nm 17 in lb In stall the 6 screws with their rubber washers over the windshield Torque to 3 0 5 Nm 25 5 in lb 2 0 3Nm 17 16 3 0 5 Nm 25 5 in lb Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Multiplexer Type Replacement Antenna Lead in Cable Multi plexer Type Replacement The multiplexer antenna system is standard on the VNL 660 and the VNL 770 and optiona
106. r time Always verify the cassette tape is in good condition before use 24 WON Design and Function W3003392 Auto reverse tape drive Tape head Capstan Pinch roller Group 39 Delco Audio System Troubleshooting Compact Disc Player CD Compact Disc players are somewhat similar to con ventional record players The disc is rotated by a motor just like record is However the CD plays inside to out side unlike the record player which plays outside to inside The speed of a record player does not change but the rotation speed of a disc does change to maintain the same velocity as the spiral diameter changes The speed slows down as the laser moves from the inside to the outside of the disc A CD player reads the information as digital electronic signals whereas a phonograph reads the information as mechanical signals An optical pickup laser beam per forms the same function as that of the record player s mechanical stylus Nothing mechanical ever touches the disc The light beam emitted from the pickup carries the data This signal is converted into an analog signal which is filtered to achieve the final audio signal which can be processed by a home stereo or a vehicle system Compact Disc A compact disc contains digitally encoded music which is read by a laser beam The data is read as a change in laser light intensity Since no stylus ever touches the disc surface there is no disc wear from playing Thus digit
107. round 8 Not Used 9 Green Illumination 10 Purple amp Data Note For detailed vehicle specific electrical schematics see VN Series Electrical Schematics Group 37 47 Group 39 Delco Audio System Troubleshooting Troubleshooting W3002407 CO CD Changer Wiring Harness The CD changer is powered and controlled by the radio and receives a battery feed Functions for the CD changer are made via a cable connection between the changer and the radio in the dash A CD changer cable harness is con nected to the changer above the passenger seat The harness is routed through the A pillar trim and connects to the stereo through the dash Reset Switch W3002994 1 Reset switch If the CD changer does not operate pressing the reset switch with a pointed object may restore normal operation 48 Group 39 Delco Audio System Troubleshooting Troubleshooting Error Messages Note The premium stereo receiver equipped with an optional CD changer can identify and display the following error codes Error Message Cause Display Message Code No Type Description Optic focus error upside FOCUS 30 CDX Focus down CD moisture etc Loss of optic tracking ERROR 31 31 CDX Tracking control Mechanism unable to com ERROR 32 32 CDX Load Eject plete load unload within specified time frame There is a communication ERROR 33 33 CDX Com
108. rs on the headliner to aid in in stallation Position the headliner in the cab below its mounting location Con nect the lamp assembly connectors Note Use caution not to bend the headliner to the point at which a permanent crease will show in the ma terial 15 Lift the headliner assembly into posi tion Temporarily secure with a few interlocking fasteners 16 If equipped install the 2 retaining clips in the center of the headliner Secure by pressing in the center button 17 If equipped install the 2 Xmas tree fasteners in the center of the headliner Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Fixed Mast Type Sleeper Cab Replacement 18 W3003095 Curtain rail or trim washer Plastic spacer Cab metal Headliner Screw Line up the mounting screws for the KE front curtain rail assembly Add the ny 25 lon spacers between headliner and cab screw holes Install all screws and retaining clips Torque to 3 0 5 Nm 25 5 in lb 19 W8001424 Place a blunt tool such as a punch in the center of the remaining retaining clips Using hand pressure press the interlocking fasteners under the retain ing clips together Use caution not to damage the retaining clips 20 Install the front overhead storage cabi 24 4 Nm net carrier rail Torque to 24 4 Nm 18 3 ft lb 18 3 ft lb 21 Use hand pressure to secure the re maining interloc
109. s Expected Value Pin 9 Alternate ground less than 1 9 If not correct check damage incorrect truck wiring and take appropriate corrective action After performing the above test if no faults were found replace the stereo receiver There are no field replaceable lamps in the stereo receiver assembly Test operation after replacement 4See Harness Connectors page 39 43 Group 39 Delco Audio System Troubleshooting Troubleshooting Cassette Tape Player Error Messages Note The premium stereo receiver equipped with a cassette player can identify and display the following error codes The basic stereo receiver does not have the ability to display error codes Error Message Cause Display Message Code No Type Description The player is unable to turn BAD TAPE 10 Tight Tape tape spindles and the tape is ejected The spindles of the tape BAD TAPE 11 Broken Tape are not turning proportion ally and the tape is ejected There is a communication ERROR 13 13 Communication problem with the tape player Dirty Head For optimal audio performance the tape heads should be cleaned after every 15 hours of playback The cleaning should take place every 50 hours to prevent damage to the playback unit Symptoms of a dirty tape path include e Incorrect tape speed e won t eject e won t play one direction e Muffled sound no high frequency response e Left
110. s IGN OFF RADIO ON the radio will play when the igni tion is turned OFF until the radio is turned off or the battery runs down Note The automatic turn off after 1 hour is only valid when the radio is turned on while the ignition is OFF Default Display 1 Press DISPL 3 to view either radio frequency or the time Pressing DISPL more than one time allows to toggle between the two displays 2 Press DISPL again hold it until it beeps to set the display To Find a Station Band Press the BAND 4 button to switch between AM FM1 FM2 The radio display shows the se lection Design and Function 6 2 TUNE Press the TUNE SEEK button 5 once to tune to the next higher or lower station one fre quency at atime Press and hold TUNE SEEK until it beep to seek the next station When a station with a strong enough signal is found the seek function will stop and the station will play Press TUNE SEEK to stop seeking Presetting Stations 6 stations per band can be preset 1 Turn the radio on 2 Select the band 3 Tune in the desired station 4 Press and hold one of the 6 push buttons 6 until it beeps Whenever the button is pressed now the station set will be played 5 Repeat steps 1 4 for each push button AS Press AS 7 Auto Store to automatically store the 6 strongest stations onto the preset push buttons AS only presets the default band SCAN Press SCAN 8 to scan all station on t
111. s with their rubber washer over the windshield Torque to 3 0 5 Nm 25 5 in lb 2 0 3Nm 17 in lb 3 0 5 Nm 25 5 in lb Group 39 Delco Audio System Troubleshooting Antenna Lead in Cable Ribbon Type Replacement The ribbon antenna is standard on the VNL 610 It is lo cated between the SMC roof panel and the headliner The VNL 610 may also be equipped with optional multi plexer antenna system Determine which antenna system is used before beginning repairs Removal 1 Remove the front left overhead storage cabinet together with the sun visor 2 Remove the right sun visor 3 If equipped remove the front right overhead storage cabinet Note Two screw covers on the far right facing panel must be removed to gain access to the mounting screws 4 Remove the front overhead storage cabinet carrier rail Antenna Lead In Cable Ribbon Type Replacement 5 Remove the driver side window visor assembly Pry off the end screw cov ers Remove mounting screws Note On sleeper models without an upper bunk steps 6 and 7 may be omitted 6 Remove the sleeper right overhead storage cabinet Disconnect the 12 volt power outlet connector Remove the lamp wiring cover screws Remove the cabinet mounting bolts Disconnect the lamp wiring connector Remove the cabinet from the vehicle 7 Remove the sleeper left overhead storage cabinet Remove the lamp wiring cover screws Remove the cabinet
112. sconnect the antenna lead in cable from the antenna Note the routing of the cable and location of the cables ties to aid in reinstallation Disconnect the left mirror harness in side the cab and pull the harness outside the cab 33 Cut cable ties as necessary to free the cable under the instrument cluster to center of the dash pull the cable through 35 Cut the heat shrink and cut cable ties as necessary to free the cable be tween the right mirror and the heat shrink pull in the lead in cable into the cab 36 Disconnect the right mirror harness in side the cab and pull the harness outside the cab 124 Group 39 Delco Audio System Troubleshooting Antenna Lead In Cable Multiplexer Type Replacement 37 4 Cut cable ties as necessary to free the cable inside the cab The lead in cable should be freed up to the multiplexer box Note the routing of the cable and location of the cables ties to aid in re installation 38 W3003365 Remove the multiplexer box together with the harnesses W8002059 Installation 1 Panel tabs 1 2 Panel torx bolts Install the new multiplexer box Pull through the CB cable then in 3 5 0 5 Nm stall the CB cable grommet to the CB 31 4 in lb 2 tray Insert the tabs of the CB tray into Route the antenna cable as it was re the front and left sides of the open moved to the radio and secure as fuse area Fit the right rear corner
113. ses In North America commercial radio signals are legis lated into two bands e 530 1710 kHz in 10 kHz steps e FM 87 9 107 9 MHz 200 kHz steps Each frequency range uses a different modulation method Since a radio wave is really just electromagnetic energy it must be controlled in a certain way to carry in formation The process of adding the information to the radio signals is called modulation There are two modu lation techniques used in radio broadcasts e AM Amplitude Modulation e FM Frequency Modulation The characteristics of the signal depend on both the fre quency and the modulation It is important to understand these characteristics to properly verify a complaint Design and Function Group 39 Delco Audio System Troubleshooting AM Band e mee si a a D 125 km 100 km WAVE AM radio signals 100 km 62 miles Radio signals in the AM band have lower frequency and longer wavelengths than the FM band Some character istics of the AM band include e The frequency used is relatively low therefore these waves can bend around obstacles and skip along the ground e The waves are reflected by the ionosphere layer in the atmosphere e Long range reception is sometimes available e AM is subject to electrical interferences e be blocked by steel and or concrete struc tures The AM frequencies have longer range due to the ground wave The ground wa
114. stics than a sine tone This tone produces a warble sound At these mid range frequencies it is better to use a warble tone than a sine wave because the location of warble tone source such as a speaker is easier to identify A normal sine tone can set up a standing wave within a vehicle which can make it difficult to determine its source location 72 Group 39 Delco Audio System Troubleshooting Troubleshooting Tweeter Test The 9 000 Hz spectral tone is used for tweeter or high frequency evaluation This tone sounds like a group of crickets chirping This type of tone is used for two reasons one much like the warble tone to locate its source and two this type of tone is easier to identify for those people with high end hearing loss problems All Speaker Test With the combination tone you will be able to quickly diagnose overall audio performance in a vehicle This tone can be used for numerous audio problems such as distorted or no sound from Listening to the combination tone you should be able to hear three distinct sounds A low pitch steady tone of 50 Hz a medium frequency warbling tone of 500 Hz and a high frequency hiss or cricket type of sound about 9 000 Hz Concentrate on the appropriate el ement of the test signal low medium or high as you listen to the different speaker locations by means of the fade and balance control This tone can be an excellent signal to use in the diagnosis of coaxial speakers For
115. sure to hold a disc with the label the side where titles are printed up as shown 2 With the disc mark on the magazine up insert disc one at a time straight into slots of the magazine un til it is locked with a click Insert each disc straight and level not tilted into a slot to avoid trouble 28 W3003004 1 Label side Design and Function Group 39 Delco Audio System Troubleshooting Design and Function To Remove a Disc 1 the magazine upside down hold it level and turn the disc release lever in the direction of release to unlock 2 The disc can now be removed from the magazine by lightly pushing them through the opening Be careful not to drop the disc Be sure to use the magazine supplied with the unit as an accessory any other magazine can not be used Never use protected film or stabilizer commercially available as a CD accessory for the unit because it may cause malfunction W3002997 1 Disc release lever How to Use the CD Changer Unit and Disc Magazine To Load a CD Magazine 1 Slide the door to the left until it is fully open with a click 2 Check the unit for its top and magazine inserting di rection and carefully push the magazine into it until you hear a click 3 Close the slid door fully until you hear a click Be sure to keep the CD door closed to prevent dirt and dust from getting into the unit and causing possi ble malfunctions W3002995 To Remove a CD
116. t grab handle by 24 4Nm starting the mounting bolt in the top of 212 30 in the handle Then torque to 24 4 Ib 212 30 in lb Install the bolt cap in the A pillar trim panel Group 39 Delco Audio System Troubleshooting 8002059 1 Panel tabs 2 Panel torx bolts 4 5 0 5Nm 3 3 0 4 ft lb Replace the top fuse and relay panel Insert the tabs of the panel into the front and left sides of the open fuse area Fit the right rear corner into place Install the 2 torx bolts 4 5 0 5 Nm 3 3 0 4 ft lb CD Changer Replacement CD Changer Replacement Before beginning this procedure disconnect any ground cables connected to the battery such as en gine ECU satellite system etc Disconnect those grounds first to avoid damaging electrical compo nents Then disconnect battery negative and positive terminals to prevent electric shock disconnect the ground terminal first Failure to do so could cause personal injury Removal 1 T8006862 Turn the ignition key OFF and discon nect the main negative battery cable 2 Check to ensure that the radio sleep timer is inactive 3002414 1 Left mounting bracket 2 Right mounting bracket 3 Mounting screw and washer Remove the four screws mounting the CD changer to the shelf 81 Group 39 Delco Audio System Troubleshooting W3002442 Right mounting bracket Left mounting bracket M5 torx bolt Positioning screw
117. t the noise source Whines squeals or buzzes are best suppressed using filter packages See Capacitors page 67 and Filters page 68 Group 39 Delco Audio System Troubleshooting Troubleshooting Harness Noise W3003060 Speaker harness noise entry 1 Radio receiver 2 Speaker Harness noise is any noise induced into speaker wires or any low level audio signal wire used to connect audio com ponents Possible Causes e Magnetic or electronic fields reaching the low level audio lines e Noisy wiring or components too close to the speaker or audio wires e Broken shorted or intermittent audio signal or speaker wires e Faulty shield wires Troubleshooting Hints e Noise induced into individual speakers is likely harness noise However if the noise is induced into har nesses between audio system components stereo receiver to amplifier etc all may be affected e Temporary speaker wires may be connected between the stereo receiver and noisy speaker to confirm har ness noise entry e Check for improper component mounting or wire routing e Make sure all shield wiring is properly connected in mating connectors 63 Group 39 Delco Audio System Troubleshooting Troubleshooting Noise Sniffer Sniffer Construction The noise sniffer be used along with the vehicle s radio to locate hot spots which are generating radio noise in terference These hot spots will be found the h
118. tailing clips Using hand pressure press the interlocking fasteners under the retain ing clips together Use caution not to damage the retaining clips Antenna Lead In Cable Ribbon Type Replacement 16 Install the front overhead storage cabi 24 4 Nm net carrier rail Torque to 24 4 Nm 18 3 ft lb 18 3 ft lb 17 Use hand pressure to secure the re maining interlocking fasteners 18 W3003260 1 Plastic rivets day cab vehicles only 2 Molding clip 3 Grab handle bolt cover Install the A pillar trims Secure with the molding clips 19 Install the grab handles Torque to 24 24 4Nm 4 18 3 ft lb Replace the bolt 18 3 ft lb cover trim 20 Install the door seals 21 Install the bezels for the front over head roof storage pockets with the star fasteners 115 Group 39 Delco Audio System Troubleshooting 22 W8001428 Install the front curtain rail assembly Position the rail and snap into the re taining clips Note Use caution not to deform the rail assembly 23 Install the sleeper curtain rail assem bly Torque to 5 1 Nm 45 7 in lb 24 If removed install the sleeper left over head storage cabinet Connect the lamp wiring connector Install the cabi net mounting bolts Torque to 24 4 Nm 18 3 ft lb Install the lamp wiring cover screws 25 If removed install the sleeper right overhead storage cabinet Feed the 12 volt power outlet connecto
119. te the tone head pinch wheel s and capstan s must be cleaned To do this use the head cleaning cassette as follows 1 Put two drops of the cleaning solution on each felt pad 2 Insert the cleaning cassette into the tape player and play for 20 seconds engage the auto reverse fea ture and clean for another 20 seconds 3 Remove the cleaning cassette Now allow 2 min utes of drying time before proceeding Note It is recommended that the cleaning cassette is used every 15 hours of play time Replace cleaning car tridges when the felt pads look dirty 1 2 3 4 t a 1 Auto reverse tape drive 2 head 3 Capstan 4 Pinch roller W3003505 45 Group 39 Delco Audio System Troubleshooting Troubleshooting CD Player Error Messages Note The premium stereo receiver equipped with a CD player can identify and display the following error codes Error Message Cause Display Message Code No Type Description Optic focus error upside SE down CD moisture etc ERROR 21 21 CD Tracking Loss of optic tracking con trol Mechanism unable to com ERROR 22 22 CD Load Eject plete load unload within specified time frame There is a communication ERROR 23 23 CD Communication problem with the CD mech anism CD Skips or Mutes e CD Changer Mounts Check for loose Stereo Receiver mounts Secure as necessary e Vibration Skip The CD player h
120. te the antenna to avoid a multipath area but in your vehicle you may drive in and out of mul tipath areas Flutter Flutter occurs when the signal strength is too low to al low proper reception Flutter can occur when in a fringe area of a transmitter Flutter can occur much closer to Design and Function FLUTTER AREA Ee SUR jena Y W3003001 the transmitter if the receiver is located in a signal shadow In a strong signal area reflection will generally fill in the reception shadows When there is little to sup port reflection an obstacle may cause a signal shadow Operating in the shadow will cause flutter This may also be called picket fencing Electrical Interference Electrical interference signal disruptions may come from electrical fields near high tension power lines vehicle electrical devices or other high power radio signals Strong FM band signals are usually not affected by elec trical interference Atmospheric Interference A loss of sensitivity especially from stations more than 25 miles away may be due to atmospheric conditions An increase in sensitivity for a short period may be due to a complementing atmospheric alignment Electrical storms will cause atmospheric interference es pecially in the AM band Group 39 Delco Audio System Troubleshooting Noise Noise is an undesirable interference in the audio system Noise can enter the audio system one of two ways con duc
121. ted or radiated e Conducted noises will have a physical connection to the audio system through one of the audio system circuits e Radiated noises have no physical connection to the audio system but the electrical or magnetic fields reaching the audio system or wiring induce an elec trical effect causing noise In diagnosing noise complaints technicians may need to identify noise sources that are physically connected back way noise or sources affected only by radiation The vehicle contains many components which ra diate an electromagnetic signal As the distance from the radio transmitter station increases on board components may begin to compete with desired radio signals The following pages will help isolate the cause of radio noise and suggest a fix EMI RFI EMI Electromagnetic Interference is the undesirable in terference of an electrical system via radiated emissions from another electrical system The term EMI includes all disturbances the electro magnetic spectrum Within the EMI category is a smaller group known as RFI Radio Frequency Interference This is the frequency group of EMI that is the radio fre quency band characteristics e RF Radio Frequency waves are radiated when a high frequency current and proper geometry exist in a circuit e Waves travel in all directions and will easily pass through non conductive materials e Waves are reflected by conductiv
122. tereo Amplifier Replacement Before beginning this procedure disconnect any ground cables connected to the battery such as en gine ECU satellite system etc Disconnect those grounds first to avoid damaging electrical compo nents Then disconnect battery negative and positive terminals to prevent electric shock disconnect the ground terminal first Failure to do so could cause personal injury Removal 1 T8006862 Turn the ignition key OFF and discon nect the main negative battery cable at the battery W3002401 1 Upper mounting screws 2 Lower mounting screws 3 Amplifier connector Remove the 2 mounting screws on the top side of the amplifier Loosen the 2 lower mounting screws 84 Antenna Mast Fixed Mast Type Replacement 3 W3002399 To unplug the connector from the am plifier slide the amplifier up Reaching to the back of the amplifier press the release tab on the center of the con nector and disconnect Remove the amplifier from the truck Installation 1 Plug in the connector for the amplifier 2 Slide the amplifier into the 2 lower screws Position the 2 upper screws and tighten all 4 screws If there are other ground cables to be connected to the battery such as engine ECU satellite system etc connect the battery ground cable first then connect those grounds Electronic modules may be damaged when additional grounds are connected disconnected without the main batter
123. the alarm sound activate snooze or turn off the alarm by pressing the alarm button 5 To check the time for which the alarm is set momentar ily press the alarm button To Turn Off the Alarm 1 Press and hold the alarm button 5 until the alarm clock icon on the display disappears To Set the Alarm Volume 1 Turn the radio on 2 Pull out the volume knob 1 gently and rotate to set the alarm volume 3 Push the knob to set the alarm volume The radio will return to the volume level at which the ra dio was previously playing e Press any button or the volume knob when the alarm is sounding The display will show SNOOZE momentarily The alarm will sound again every 9 minutes until it is turned off Group 39 Delco Audio System Troubleshooting 3 10 Radio Power The radio can be turned on when the ignition is ON or OFF by pushing the PWR knob 1 If the ignition is OFF the radio will play for one hour and automatically turn off sleep feature IGN OFF Radio ON OFF The radio can be pro grammed to switch on and off independent of the ignition 1 Turn the ignition ON and the radio off 2 Press and hold push buttons 1 and 2 at the same time until it beeps The radio display will show IGN OFF RADIO OFF or IGN OFF RADIO ON 3 Repeat this procedure to implement the opposite condition If the display reads IGN OFF RADIO OFF the radio will turn off when the ignition turns OFF If the display read
124. the front curtain rail assembly Remove all that are attached with screws Note Nylon spacers are used be tween the headliner and cab mounts note their position for reassembly Group 39 Delco Audio System Troubleshooting Antenna Mast Ribbon Type Replacement 12 13 Lu J W8001424 The headliner is now held in place by interlocking fasteners Start at one door and work under the headliner with fingers to pop apart the interlock ing fasteners The fasteners should be at each remaining front curtain rail re taining clip and at various points over W3003260 the body of the headliner A long 1 Plastic rivets day cab vehicle only screwdriver or similar tool may be 2 Molding clip used to free the hard to reach inter 3 Grab handle bolt cover locking fasteners After all fasteners are released and the headliner drops Remove the upper grab handle bolt disconnect the lamp assembles and cover from the A pillar trim Remove remove the headliner from the vehicle the bolt and pull the upper grab handle out of the cover Repeat on the other Note Use caution not to bend the side headliner to the point at which a Pull the door seal away from the A permanent crease will show in the ma pillar trim and the top of the door terial Remove the molding clip by pressing in the center button Remove the A pillar trim Repeat on opposite side 87 Group 39 Delco Audio System Troubleshooting
125. tion 2 3 W3003401 Note When driving on a very rough road or if it is very hot the disc may not play and ERROR and a number may appear for 5 seconds on the display Error may also appear if a disc is dirty wet or the air is very humid Note If a CD is inserted upside down FOCUS will ap pear on the display Remove the CD and insert it with the label up RDM Press the RDM button 4 to activate random track selection RDM will illuminate All tracks on the CD will be played in random order RDM on the display indicates random play on Press this button again to turn off the random play beginning with the next track played RPT Press the RPT button 5 to repeat the same track again RPT on the display indicates that this feature is on and the track will be repeated until the RPT button is pressed again The disc number and track number will also show on the display SCAN Press the SCAN button 6 to immediately ad vance to the next track SCAN will appear on the display and 10 seconds of the track will be played the CD will advance to the next track play 10 seconds and continue To deactivate SCAN press the SCAN button again DISPL Press the DISPL button 7 to view the disc number elapsed time track number or the time Press ing the DISPL button more than one time allows to toggle between the displays Press the DISPL button and hold it until it beeps to set the default display 21 Group 39 Delco Audio S
126. to select FM1 FM2 or AM If in radio mode press the SEEK A button 7 to move to the next strongest radio station up the band If in cassette or CD mode press the SEEK A button 7 to go to the next track of the cassette or CD If in radio mode press the SEEK e button 8 to move to the next strongest radio station down the band If in cassette or CD mode press the SEEK e button 8 to go to the beginning of the cassette or CD track Press the AUX button 9 to play a CD loaded in the CD changer Press this button again to select the next loaded CD Press this button 10 to turn on integral cassette or CD player Press this button again to change tape sides or advance to the next CD track CD Changer How to operate a CD changer see To Play CDs Loaded in the CD Changer page 30 Design and Function W3003537 23 Group 39 Delco Audio System Troubleshooting Cassette Tape Player Cassette tapes operate on the basis of magnetics When an unrecorded tape passes through the record head the oxide particles are magnetized such that the pattern rep resents electronically the sound information that one wishes to record Once the information has been recorded it is played back by the tape passing over the playback head The magnetically stored information is decoded as electrical voltages These differences in volt ages are amplified through several stages until an audio signal is obtained Those parts most import
127. ve follows the curvature of SKY WAVE GROUND Design and Function DAY W3003003 the earth and is effected by its conductivity The greater the conductivity the less the signal loss so transmission over water is better than over land The ground wave in this frequency band has a range of 80 320 kilometers 50 200 miles The sky wave will pass through the atmosphere and re flect off of the ionosphere to the vehicle s antenna At night the ionosphere is actually higher than during the day so it is possible for AM signals from great distances to be received during nighttime hours As a result many AM stations actually reduce transmitting power in the evening hours to maintain the same coverage as during the day Group 39 Delco Audio System Troubleshooting FM Band a ae GROUND WAVE FM band signal 100 km 62 miles Radio signals in the FM band have higher frequency and shorter wavelengths than the AM band Some character istics of the FM band include e FM is able to eliminate atmospheric noise mainly due to its method of propagation Atmospheric noises are generally amplitude related and have lit tle effect on FM signals e Reflect off of obstacles e Penetrate the ionosphere Radio frequencies over 30 MHz are effectively absorbed by the earth eliminating the ground wave Even when out of a direct line of sight the signal may be reflected into areas that would be a shadow otherwise
128. w E Remove the screw securing the front and sides of the headliner Note The screws are equipped with plastic spacers between the headliner and the cab sheet metal Use caution not to lose them during headliner re moval 8 Release the 2 retaining clips in the center of the headliner by pressing in the center button Remove the retain ing clips Note May not apply depending on in terior trim level me W3003261 1 Headliner 2 Xmas tree fastener 3 Removal tool J38778 Remove the 2 Xmas tree fasteners in J38778 the center of the headliner with the re moval tool J38778 Use caution not to damage the headliner material Note May not apply depending on the interior trim level Antenna Lead In Cable Fixed Mast Type Day Cab Replacement 10 The headliner is now held in place by a few interlocking fasteners and the rear wall B pillar trim Pull the door seal away from the top of the B pillars Pull the B pillars trim away at the top to allow removal of the headliner Pull the front of the headliner down and lift up on the rear to free the rear headliner lip Disconnect the lamp as sembles and remove the headliner from the vehicle Note This step requires 2 technicians Use caution not to bend the headliner to the point at which a permanent crease will show in the material W8001131 Remove the 7 torx screws from the lower right dash panel Remove the 4 screws from th
129. y ground connected Always reconnect the main battery ground first Connect the main negative battery ca ble and check for operation of the amplifier and stereo system Group 39 Delco Audio System Troubleshooting Antenna Mast Fixed Mast Type Replacement The fixed mast antenna is standard on the VNM VNL day cabs and the VNL 420 sleeper cab vehicles These vehicles may also be equipped with optional multiplexer antenna system Determine which antenna system is used before beginning repairs 1 Remove the mast e Install the new mast Torque to5 0 8 5 Nm 44 7 in lb 44 2 0 8 Nm 7 in lb Note Adjust the swivel base as nec essary Torque to 1 5 0 5 Nm 13 4 4 in Ib Antenna Mast Ribbon Type Replacement Antenna Mast Ribbon Type Replacement The ribbon antenna is standard on the VNL 610 It is lo cated between the SMC roof panel and headliner The VNL 610 may also be equipped with the optional multi plexer antenna system Determine which antenna system is used on the vehicle before beginning repairs Removal 1 Remove the front left overhead storage cabinet together with the sun visor 2 Remove the right sun visor 3 If equipped remove the front right overhead storage cabinet Note Two screw covers on the far right facing panel must be removed to gain access to the mounting screws 4 Remove the cabinet carrier rail assem bling screws 85 Group 39 Delco Aud
130. ystem Troubleshooting 2 4 Design and Function Theftlock When THEFTLOCK is activated the radio will display LOCKED to indicate a locked condition anytime battery power is removed If your battery loses power for any reason you must unlock the radio with the secret code before it will operate To unlock a locked radio see Theftlock page 37 The instructions that follow explain how to enter your se cret code to activate the THEFTLOCK system It is recommended that you read through all 11 steps before starting the procedure Note If you allow more than 15 seconds to elapse be tween any of the steps the radio will automatically revert to time and you must start the procedure over at step 4 To activate THEFTLOCK 1 Choose a 4 digit code between 0000 and 9999 Note Keep the code in a secure place 2 Turn the ignition ON Turn the radio off 2 4 Press push buttons 1 and 4 3 at the same time Hold them until shows on the display 4 5 Press MN 5 0000 will appear on the display 6 Press MN 5 as many times as needed to make the last two digits agree with the secret code you have chosen 7 Press HR 6 as many times as needed to make the first two digits agree with the secret code you have chosen 8 Confirm that the code on the display matches your secret code 22 3 9 Press BAND 1 The display will show REPEAT to let you know that you need to confirm your

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