ML22362 - HWH Corporation
Contents
1. we TO SUSPENSION _ EXISTING AIR LINE FRONT MANIFOLD PROTECTION VALVE a e gt Sey REAR MANIFOLD m CONTROL VALVE S AIR SUPPLY q l 4 HEIGHT CONTROL VALVE 3 PLACES MANIFOLDS ARE MOUNTED TO MAIN CROSS MEMBERS LEAVE AMPLE CLEARANCE FOR CONNECTION OF HOSES TO FITTINGS LINE FROM HEIGHT LINE TO AIR BAGS 75 3520 27 00 AIR LEVEL SCHEMATIC NEWAY 4 POINT LEVELING WITH WATER TRAP PRESSURE SWITCHES FRONT AND REAR SEE WATER TRAP PROTECTION AIR ASSEMBLY VALVE TANK DIAGRAM FA 1 HA 3 FRONT HEIGHT CONTROL VALVE FRONT MANIFOLD ASSEMBLY MP75 3525 27 00 AIR LINE CONNECTION DIAGRAM REYCO SEE WATER TRAP ASSEMBLY DIAGRAM TO SUSPENSION 1 FRONT EXISTING AIR2. 1 PROTECTION FRONT MANIFOLD VALVE ate 1 oe AIR TANK 1 f 8 Sy REAR MANIFOLD LINE FROM HEIGHT CONTROL VALVE AIR SUPPLY HEIGHT CONTROL VALVE 3 PLACES MANIFOLDS ARE MOUNTED TO MAIN CROSS MEMBERS LEAVE AMPLE CLEARANCE FOR CONNECTION OF HOSES TO FITTINGS LINE TO AIR BAGS MP75 3530 27 00 AIR LEVEL SCHEMATIC REYCO 4 POINT LEVELING WITH WATER TRAP PRESSURE SWITCHES FRONT AND REAR AIR SEE TANK WATER TRAP ASSEMBLY PROTECTION DIAGRAM VALVE 54 REAR HEIGHT CONTROL VALVE HCV MP75 3535 27 00 COMPRESSOR DIAGRAM GRAY FROM AIR SOLENOID 12 VOLT RELAY 2 0 GROUND NOTE THE 4 DIGIT WIRE NUMBER SUPERSEDES ANY AND ALL WIRE COLORS M LN FUSE 22 15 12 SIGNAL FROM PRESSURE SWITCH O Lee TO 12 BATTERY POWER 6100 CHECK VALVE 4 FLOW AIR LINE SUSPENSION PRESSURE SWITCH 1
3. is a 1 wire plug check between the plug and ground If power is present check the ground for the solenoid if it is a 1 wire plug Replace the valve if power is present and the ground is OK If power is not present a wire or connection is bad If a 2 wire plug is used the white wire is ground Check for power between the colored black wire and a frame member If power is present repair the ground wire If power is not present repair the colored black wire If diagonal bags such as left front and right rear deflate or inflate when a side arrow is pushed the wiring or plumbing connection are switched Check the diagrams and redo connections according to the diagrams Check the appropriate fuse for that raise solenoid valve If the fuse is blown the valve or the power wire to the valve is shorted If the fuse is not blown check for power on the corresponding pin in the control box If power is not present replace the control box If power is present on the pin the problem is the wire to the valve the ground for the valve or the valve Check for power in the har ness plug If it is a 2 wire plug check between the two pins in the plug is a 1 wire plug check between the plug and ground If power is present check the ground for the solenoid if it is a 1 wire plug Replace the valve if power is present and the ground is OK If power is not present a wire or connection is bad If a 2 wire plug is used the white wire is ground
4. CORPORATION SERVICE MANUAL HWH COMPUTER CONTROLLED 500 SERIES LEVELING SYSTEM FEATURING Touch Panel Leveling Control Four Point Air Leveling HWH COMPUTERIZED LEVELING SLOPE 4 BRAKE UNDERSTAND OPERATOR S MANUAL BEFORE USING BLOCK FRAME AND TIRES SECURELY BEFORE REMOVING TIRES OR CRAWLING UNDER VEHICLE HWH CORPORATION On I 80 Exit 267 South 2096 Moscow Road Moscow lowa 52760 Ph 800 321 3494 or 563 724 3396 Fax 563 724 3408 www hwh com 1 22362 191 0019 06 04 SECTION 1 SECTION 2 SECTION REPAIR STEPS p 3 PART FOLDER s HOW TO USE MANUAL This manual is written in three sections Section 1 is the Trouble Shooting Steps Section 2 is the Repair Steps Section 3 is the Diagrams Begin diagnosis of the system with Section 1 the Trouble Shooting Steps This will give the correct operation and function of the system When a malfunction is encountered the Trouble Shooting Steps will direct you to the proper Repair Steps in Section 2 the Repair Steps The Repair Steps are broken into 3 columns Problem Solution and Diagram In the proper part under Problems find the symptom you have encountered The testing and repair for that problem is in the Solu tion center column Diagrams for a particular Problem and Solution are in the Diagram right hand column This column will direct you to the pr
5. 2 DA OQ ORANGE 2210 3 BLUE 4210 4 YELLOW 3210 5 WARNING LIGHT CONTROL PURPLE 7699 COMPRESSOR BROWN 9700 40PIN CONNECTOR T COMPRESSOR 270 0 LR RAISE GREEN 4500 LR LOWER PURPLE 4600 REAR TRAVEL SOL GRAY 3700 RR LOWER BROWN 3600 RR RAISE ORANGE 3500 RED REAR GREEN RIGHT SIDE SENSING BLACK FRONT UNIT YELLOW LEFT SIDE 0 HARNESS WHITE GROUND NOTE THE FOUR DIGIT WIRE NUMBER SUPERSEDES ANY AND ALL WIRE COLORS mmm m m W PART amp SERIAL NUMBER STICKER ESSEX RELAY MOUNTED ON INSIDE OF BOX MASTER RELAY RED 8500 PUMP RELAY GRAY 8600 10 WIRE BLACK 6800 PUMP MS HARNESS MANIFOLD PRESS SW 8100 HORIZ VERT YELLOW 8401 R R ORANGE 3400 ua 10 WIRE L R BROWN 4400 FROM PUMP HARNESS STABILIZE PURPLE 8400 BLACK 6800 R F GREEN 2400 L F BLUE 1400 HYDRAULIC HARNESS FUSE DESIGNATION GROUND STUD MO
6. LINE TO AIR BAGS AIR SUPPLY r CHECK VALVE REAR VIEW 52 7 gt by 2 01 by MOUNTING HOLES LINE FROM HEIGHT ac CONTROL VALVE 2 MAY BE TEE D TOGETHER IF ONE TRAVEL SOLENOID HCV IS USED VALVE 2 RIGHT 8 LEFT LOWER SOLENOID PRESSURE SWITCH 2 __ VALVE 2 RIGHT amp LEFT EXHAUSTS PORT 2 LINE TO AIR BAGS 2 LEFT amp RIGHT gee RAISE SOLENOID VALVE 2 RIGHT amp LEFT AIR SUPPLY 1 pane CHECK VALVE 2 SIDE VIEW MP75 4555 19MAY97 CONTROL BOX CONNECTION DIAGRAM MASTER AIR BAG PRESSURE WARN SWITCH SENSORS LIGHT FROM FRONT AND oeoeeee REAR AIR HARNESS E PARK BRAKE SENS BLUE 9000 PARK HARNESS HARNESS BRAKE OOO REMOT INDICATORS LF RAISE GREEN 1500 LF LOWER RED 1600 FRONT TRAVEL GRAY 1700 RF LOWER BLUE 2600 RF RAISE YELLOW 2500 BATTERY RED 6100 IGNITION YELLOW 6110 ACCESSORY BROWN 6120 BLACK 1210 1
7. ADJUSTMENT INSTRUCTIONS LEVEL SENSING UNIT The sensing unit must be mounted to a solid surface and must not be exposed to any heat sources Toward the middle of the vehicle but outside the frame rails is best The sensing unit may be mounted between frame rails on pusher vehicles and trailers The sensing unit may be mounted in a compartment but needs to be protected from stored objects It is critical that the sensing unit is mounted in the proper position according to the sticker on the sensing unit See figure below The springs should be com pressed to approximately 1 25 inches The correct method for adjusting the sensor is as follows First level the vehicle by placing 24 level in the center of the vehicle the floor With the vehicle level adjust the sensing unit until all yellow lights are out This is done by drawingup or backing out the sensing unit screws If a front light is on adjust the front screw side light is on adjust the side screw If a rear light is on adjust the rear screws One or more screws may have to be adjusted to turn the yellow lights out After adjustment has been made pull down on the sensing unit to make sure the unit is bottomed out on the screw heads Check to make sure all yellow lights are out If not readjust Rock the vehicle and re check for yellow lights readjust if needed NOTE The sensing unit has an accuracy tolerance of 1 side to side and 5 4 front to rear on a 36 vehic
8. AISE buttons DUMP Button This button will lower the whole coach by dumping air from the suspension system RAISE Button This button will raise the whole coach by adding air to the suspension system UP ARROWS These are the RAISE manual buttons DOWN ARROWS These are the LOWER manual buttons INDICATOR LIGHTS AIR OPERATION light This light will be on when the system is on and flash during automatic leveling AIR DUMP light This light will flash when the DUMP button is being pushed RAISE light This light will flash when the RAISE button is being pushed EXCESS SLOPE light This light will be on if the leveling system can NOT level the coach TRAVEL light This light will be on if the leveling system is off and the coach suspension is operable AIR BAG lights These lights will be on when the system is on if the ignition is on or if the ignition is on and an air bag has low air pressure that individual red warning light will be on The coach should NOT be moved while these lights are on LEVEL SENSING lights One or two yellow lights can be on indicating that side or end of the coach is low NOT IN PARK BRAKE light This light will be on if the AIR button is pushed and the park brake is not set 91 102 26 TROUBLE SHOOTING STEPS NOTE The coach should be at the proper ride height before starting the Trouble Shooting Steps 1 Make sure the transmission is in the rec
9. Check for power between the colored black wire and a frame member If power is present repair the ground wire If power is not present repair the colored black wire DIAGRAMS RAISE SOLENOID VALVE 2 RIGHT amp LEFT REFER TO MP75 4555 REFER TO MP85 3530 REFER TO MP75 3520 OR 75 3530 REFER 85 3535 N b S O44 9 N N OR RAISE SOLENOID VALVE 2 RIGHT 8 LEFT REFER TO MP75 4555 REFER TO MP85 3530 91 204 28 00 PROBLEM Part 4 continued d The compres sor will not run when pushing up arrows NOTE If the air system is fully pres surized the com pressor should not run Pumping the brake pedal sev eral times will re duce pressure in the system allow ing the compres sor to run Part 5 Yellow level indi cator lights will not work properly REPAIR STEPS SOLUTION The 9700 wire for the air compressor is in the rear air manifold harness It goes to the 3 pin compressor plug in the box When an up arrow is pushed there should be 12 power on this wire Check the corresponding pin in the box
10. Check the pin with the test light If a ground is not present replace the control box If ground is present connect the test light to ground Touch the four pins for the color coded wire Each pin will light one yellow light If this is so the problem is the sensing unit If not re place the control box Check that the sensing unit is mounted correctly according to the sticker on the sensing unit DIAGRAMS REFER 85 4525 REFER MP85 3530 REFER TO MP85 9505 91 205 01 00 PROBLEM Part 6 After pushing the AIR button twice the system will not level properly Part 7 The coach will not return to the pro per travel height with the ignition on and the system off Part 8 The coach will not raise or lower when using the RAISE and DUMP button The coach will not return to travel height when the button is released REPAIR STEPS SOLUTION AUTOMATIC LEVELING If the system will not function properly in the automatic mode check steps 1 thru 5 If the system works manually replace the control box Remember low voltage situations and poor ground connections will cause erratic leveling Check
11. ER TO MP85 3530 x 85 3530 TRAVEL indicator light AIR OPERATION Indicator light REFER MI91 102J OF SECTION REFER TO MP85 3530 91 202 28 00 PROBLEM Part 4 When pushing an up or down arrow a Anair bag will not deflate when pushing LOWER maunual button down arrow NOTE The coach should be at proper ride height when testing down arrows b Diagonal air bags deflate or in flate when a side manual button up or down arrow is pushed c Air bags will not inflate when a RAISE manual button up arrow is pushed REPAIR STEPS SOLUTION Check that the exhaust ports af the air manifolds are not plugged Check the fuse for the appropriate lower solenoid valve If the fuse is blown the solenoid valve is bad or the power wire for the solenoid valve shorted If the fuse is not blown check for power on the corresponding pin in the control box If power is not present replace the control box If power is present on the pin the problem is the wire to the valve the ground for the valve or the valve Check for power in the har ness plug If it is a 2 wire plug check between the two pins in the plug
12. ES AIR OPERATION indicator light OFF BUTTON REFER MI91 102J OF SECTION I TRAVEL Indicator light REFER MI91 102J OF SECTION REFER TO MP85 3530 IB z 1 9 IO REFER TO MP75 4555 IB i REFER 85 3530 91 202 26 00 PROBLEM Part 3 After pushing the AIR button one time a The system will not turn on and no lights except the TRAVEL light are on b All of the panel lights come on and stay on c The on indicator light will not stay on and the NOT IN PARK BRAKE light comes on while the AIR button is be ing pushed d Opposite yellow lights come on e With the ON indicator light lit the TRAVEL light will not go out f The master warning light is not on REPAIR STEPS SOLUTION Check the battery fuse If it is not blown the control box touch panel or cable is bad If the battery fuse is blown replace the fuse unplug th
13. If 12 is not present replace the control box NOTE There is no fuse for the compressor wire The power comes from the battery fuse in the control box If the battery fuse is blown the system will not turn on If 12 compressor power is present at the control box check for power at the compressor The compressor harness plug A should have 12 power when an up arrow is pushed If not the wire is bad If power is present check the 12 battery power B at terminal 1 of the 12 volt relay C on the compressor assembly That wire should be fused If there is no power check the fuse the wire the connect ions and the source If there is power to the relay and the compres sor will not run the problem is the pressure switch D the relay C or the compressor motor E Jump power from terminal 1 to Terminal 2 If the compressor does not run check the ground connections at terminal 7 If OK the com pressor should be replaced If the compressor does run jump power from terminal 1 to terminal 3 If the compressor does not run check the ground for terminal 4 If OK replace the relay C If the compressor runs check for power at Terminal 5 If power is not pre sent the short brown lead F or the connection to the compressor harness A is bad If power is present replace the pressure switch D Unplug the sensing unit from the control box Connect the test light to 12 The pin for the white wire of the sensing unit is a ground
14. NIFOLD JACK TRAVEL GRAY 3700 LR PRESS SW BLUE 4210 LR LOWER PURPLE 4600 LR RAISE GREEN 4500 SENSING UNIT O O O FRONT AIR fee BATTERY Pike MANIFOLD RED 6100 HARNESS IGNITION YELLOW 6110 BROWN 6120 TRAVEL GRAY 1700 RF AIR PRESSURE SWITCH ORANGE 2210 RF LOWER BLUE 2600 RF RAISE YELLOW 2500 SEE AIR SOLENOID MANIFOLD DIAGRAM NOTE THE FOUR DIGIT WIRE NUMBER SUPERSEDES ANY AND ALL WIRE COLORS TRAVEL GRAY 3700 RR PRESS SW YELLOW 3210 RR LOWER BROWN 3600 RR RAISE ORANGE 3500 SEE AIR SOLENOID MANIFOLD DIAGRAM MP85 3535 08 99 ELECTRICAL CONNECTION DIAGRAM AIR COMPRESSOR COMPRESSOR 12 SIGNAL BLACK OR BROWN 9700 HARNESS FROM CONTROL BOX A NOTE THE 4 DIGIT WIRE NUMBER SUPERSEDES ANY AND ALL WIRE COLORS PRESSURE SWITCH D OPEN 115 PSI CLOSE 105 PSI WHITE GROUND BROWN 12 F ORANGE 12 VOLT ESSEX BLACK GROUND RELAY C RED 12 1 L 2 COMPRESSOR MOTOR E 15 AMP B GRAY GROUND GRAY 12 SIGNAL RED 6100 NORMALLY OPEN 12 VOLT AIR SOLENOID 12 VOLT BATTERY POWER 85 4525 14FEB02 MOUNTING AND
15. NORMALLY CLOSED OPEN 115 P S I CLOSED AT 105 1 G AIR FILTER S A NORMALLY OPEN AIR SOLENOID 3 The control box sends 12 signal to the normaly closed ssure switch 1 If the pressure is low the 12 volt relay 2 will energize and the compressor will run The normally open air solenoid 3 will close allowing the compressor to build pre ssure When the pressure builds to 115 P S I the pressure switch will open stopping the air compressor GROUND TO RELAY MOUNTING BOLT COMPRESSOR HARNESS FROM CONTROL BOX BLACK 9700 The normaly open air solenoid 3 will open allowing internal pressure amp moisture to bleed off The check valve 4 will keep the suspension air from bleeding back to the compressor As air pressure drops below 105 P S I the compressor will start MP75 4525 99 AIR SOLENOID MANIFOLD 6 VALVE WITH TWO PRESSURE SWITCHES 3 LINE FROM HEIGHT CONTROL VALVE PRESSURE SWITCH
16. UNTED 1 RIGHT FRONT LOWER 12TRAVEL j OP ROA 2 RIGHT FRONT RAISE 13 TRANSMISSION SW Sc 3 BATTERY 14 MASTER RELAY 4 IGNITION 15 PUMP 5 ACC 16 RIGHT REAR SOLENOID aaa 6 RIGHT REAR LOWER 17 HOR VERT SOLENOID 6254 7 LEFT REAR LOWER 18 LEFT FRONT SOLENOID 6258 8 LEFT REAR RAISE 19 RIGHT FRONT SOLENOID GROUND 10 WIRE 9 RIGHT REAR RAISE 20 STAB SOLENOID TO FRAME RAIL 10 LEFT FRONT RAISE 21 LEFT REAR SOLENOID GROUND WIRES 11 LEFT FRONT LOWER FROM FRONT amp MP85 3530 REAR AIR HARNESS 22FEB02 ASSEMBLY SEE WATER TRAP DIAG BROWN 9700 GROUND 1 10 GROUND 4 6258 6254 7 ELECTRICAL CONNECTION DIAGRAM AIR LEVELING SYSTEM WITH TOUCH PANEL CONTROL SEE CONTROL BOX CONNECTION DIAGRAM cABLE YELLOW 3210 RIBBON LIGHT ON DASH FROM POWER HARNESS FOR MASTER WARNING INDICATORS PURPLE 7699 TOUCH PANEL COMPUTERIZED LEVELING A PARK BRAKE lt SWITCH 9000 Z Z PARK BRAKE PIGTAIL POWER BLUE 9000 HARNESS TRAVEL GRAY 1700 LF AIR PRESSURE SWITCH BLACK 1210 LF LOWER RED 1600 LF RAISE 1500 REAR AIR MA
17. e compressor wire then press the AIR button again If the fuse blows again replace the control box If the fuse does not blow and the system turns on the compressor wire is probably shorted to ground The microprocessor is bad Replace the control box It also could be a bad touch panel Make sure the park brake is set Check for a ground on the BLUE 9000 Park Brake Sensor wire If a ground is present replace the con trol box If a ground is not present trace the BLUE 9000 wire and check its connection Check the park brake switch Unplug the sensing unit cable There are five pins The pin for the white wire is the ground for the sensing unit The other four pins are for the front rear left and right side yellow lights Ground each indi vidual pin Only one light should come on per pin If more than one light comes on replace the control box If only one light comes on replace the sensing unit The travel light should not be on when the system is on Replace the control box The PURPLE 7699 wire from the master warning indicator output should be a ground when the the system is on and the ignition is in the ON position If not replace the control box If ground is present check the PURPLE 7699 wire at the light Check the 12 power for the light or replace the bulb DIAGRAMS REF
18. er har ness will have 12 volts with the ignition in the ON position The RED 6100 wire should have 12 volts with the ignition in any position If the YELLOW 6110 wire has power replace the control box If not trace the YELLOW 6110 wire to its source With the system off and the ignition in the ON position the master warning light will come on and the TRAVEL light will go out if an air bag has low pressure The corresponding red warning light will be on If the coach is not at the proper ride height start the coach engine and build up air pressure Make sure there is 20 psi in all air bags The master warning light should go out and the TRAVEL light should come on as the coach returns to the proper ride height If the coach will not return to the proper travel height see Section 7 of the TROU BLE SHOOTING STEPS If the master warning light is lit the TRA VEL light is not on and the coach is at the proper ride height there is a bad pressure switch or a shorted pressure switch wire for the red warning light that is lit There are two pressure switches on each manifold Unplug the switch corresponding to the lit red warning light If the warning light goes out replace the pressure switch If the light does not go out unplug the appropriate harness from the control box If the light goes out the pressure switch wire is shorted to ground If the light does not go out the problem is the control box or the ribbon cable FIGUR
19. he appropriate red warning light and the master warning light on if the ignition is on and the leveling system is off The pressure switches do not inhibit any leveling procedures When an up arrow is pushed a 12 signal is sent to the auxiliary air compressor and the corresponding raise solenoid on the air manifolds The raise valves open the air bags to inflate lifting the coach The air compressor will only run as the system pressure drops When a down arrow is pushed a 12 signal is sent to the cor responding lower solenoids The lower valves will open allow ing the air bags to deflate lowering the coach Test each set of up and down arrows checking that the appro priate air bags will inflate and deflate and that the auxiliary compressor will run during the raise function If there is any malfunction see Part 4 of the REPAIR STEPS 5 SENSING UNIT CHECK Using a bubble level inside the coach level the coach using the up and down arrow buttons All yellow indicator lights should be off at this time If not the sensing unit may need to be adjusted A yellow light indicates that side or end of the coach is low Check that all yellow lights can be made to come on at different times by raising and or lowering the ends and sides of the coach If the ground is too uneven the coach may need to be moved to complete this test For sensor adjustment procedure see MP85 9505 For sensor testing see Part 5 of the REPAIR STEPS From this point o
20. ld contact HWH technical service 800 321 3494 before beginning Special attention should be given to all cautions wiring and air diagrams Special note When installing a new control box make sure the box is properly grounded before applying power to the system Suggested tools for trouble shooting the HWH leveling systems JUMPER WIRES UP TO 10 GAUGE MULTI METER 12 VOLT TEST LIGHT PROCEED WITH THE TROUBLE SHOOTING STEPS ON THE FOLLOWING PAGE MI91 101J 28 00 CONTROL IDENTIFICATION TRAVEL Indicator light AIR OPERATION Indicator light AIR BUTTON COMPU 55 AIR DUMP SLOPE Indicator light DUMP BUTTON RAISE Indicator light TRAVEL IN PARK CAUTIO SECURELY BEFORE REMOV OFF BUTTON RAISE Button RAISE LEFT SIDE AL BE G TIRI EXCESS SLOPE Indicator light LOWER FRONT Manual Button Indicator light RAISE FRONT Manual button AIR BAG Indicator light 4 red RAISE RIGHT SIDE Manual button LOWER RIGHT SIDE Manual button LEVEL SENSING Indicator light 4 yellow RAISE REAR Manual button LOWER LEFT SIDE LOWER REAR Manual button Manual button Manual button CONTROL FUNCTIONS CONTROL BUTTONS AIR Button This button is the system on button and automatic operation button OFF Button This button will turn the system OFF but does NOT control power to the DUMP or R
21. le SOLID MOUNTING SURFACE ai SPRINGS 3 Cc SENSING UNIT SCREWS 3 4 DIA X 3 4 THICK CROSS MTG BI AXIS SENSING UNIT MP85 9505 01JUL98
22. n it is assumed the system is fully func tional in the manual mode Whenever a malfunction occurs revert to the manual operation and check for correct func tioning If a problem is found in manual operation trouble shoot the problem using the preceding steps Remember low volts can cause erratic performance and damage com ponents AUTOMATIC LEVELING 6 Start the coach engine Set the park brake Push the AIR button one time to turn the system on Push the AIR button a second time This will start automatic leveling The following should occur The four red warning lights will be on The indicator light above the AIR button will start to flash The master warning light will be on The coach will automatically level itself The leveling pro cedure is as follows o o o Ifthere are no yellow lights the control box will go directly into a sleep mode If there are yellow lights on leveling will start in a down mode deflating air bags opposite to lit yellow level indica tor lights After 2 minutes if the coach is not level the com puter will switch to the UP mode inflating air bags ac cording to lit yellow lights During any raise UP function the compressor may run When all the yellow lights are are out the control box goes into the sleep mode SLEEP MODE After leveling the coach the control box will remain on but inactive for 30 minutes After 30 minutes the control box will wake up and monitor the yell
23. n or off and the ignition on or off If the system is on the system will turn off when the button is released The DUMP and RAISE button will lower or raise the whole coach If they are not working correctly see Part 8 of the REPAIR STEPS CAUTION Do not exceed 5 mph or travel long dis tances when using these buttons or if the coach is not at the proper travel height MI91 103J 26 00 SECTION 2 500 SERIES REPAIR MANUAL HWH COMPUTER CONTROLED LEVELING SYSTEM TOUCH PANEL CONTROL 4 POINT AIR LEVELING BEGIN WITH SECTION 1 91 2013 07 01 PROBLEM Part 1 Touch panel has indicator lights on with the ignition switch off Part 2 With the ignition switch on a The green TRAVEL light nor the master warning light is lit NOTE If the vehi cle is not equipped with a master warn ing light proceed to Part 2b b The master warning light is lit and or the travel light is not lit One or more red warni ing lights on the touch panel is lit REPAIR STEPS SOLUTION If the ON indicator light is on press the OFF button If the ON light or any other light remains on replace the control box If the ON light is not on and any other light is on replace the control box Whenever the ignition switch is ON one of these lights will be lit but never both at the same time If neither light is on check the power to the control box The YELLOW 6110 wire in the pow
24. ommended position for parking and the park brake is set The ignition switch should be in the OFF position If any touch panel lights are on see Part 1 of the Repair Steps 2 Turn the ignition switch to ON Only the green TRAVEL light should be lit If this is not so see Part 2 of the Repair Steps 3 Press the AIR button one time The ON indicator light should come on One or two yellow level indicator lights may come on The four red AIR BAG indicator lights and the Master Warning Light should be on The TRAVEL light should NOT be on If this is not correct see Part of the Repair Steps 4 MANUAL OPERATION With the system the manual up and down arrows should function These buttons are momen tary buttons Releasing the button will stop the function Each set of arrows operate pairs of air bags front rear or sides There are two air manifolds One for the front air bags and one for the rear air bags Each manifold has six air solenoid valves A right and left raise valve a right and left lower valve anda right and left travel valve See MP85 3535 The travel sole noids are tied together electrically in the harnesses and should be on if the ignition is in the ON position and the system is off The manifolds have a right and left air pressure switch When the pressure in one air bag drops to approximately 20 psi the pressure switch for that bag completes a ground sig nal for the control box This will turn t
25. oper diagram in Section 3 Diagrams for a more detailed view Before beginning your repair it is IMPORTANT to read the CAUTIONS and NOTES AND CHECKS in the first section TROUBLE SHOOTING STEPS In many cases this will save time and mistakes when trouble shooting a system This Repair Manual is offered as a guide only It is impossible to anticipate every problem or combination of problems This manual is written in sequential order of the proper operation of the system The Trouble Shooting Steps must be followed in order to give correct diagnosis of the problem s For any problems encountered that are not addressed in this manual contact HWH Corporation for assistance NOTE Diagrams in this manual are of typical systems There may be plumbing or harness differences In most cases this should not effect trouble shooting procedures PROCEED WITH TROUBLE SHOOTING GUIDE 91 1015 18JUN01 TROUBLE SHOOTING CAUTIONS BLOCK FRAME AND TIRES SECURELY BEFORE CRAWLING UNDER VEHICLE DO NOT USE AIR SUSPEN SION TO SUPPORT VEHICLE WHILE UNDER VEHICLE OR CHANGING TIRES VEHICLE MAY DROP AND OR MOVE FORWARD OR BACKWARD WITHOUT WARNING CAUSING INJURY OR DEATH DO NOT EXCEED 5 MPH OR TRAVEL LONG DISTANCES WHEN THE SUSPENSION IS NOT AT THE PROPER RIDE HEIGHT SAFETY CLASSES ARE TO BE WORN TO PROTECT EYES FROM DIRT METAL CHIPS OIL LEAKS ETC FOLLOW ALL OTHER SHOP SAFETY PRACTICES NOTES AND CHECKS Read and check before preceding wi
26. ow lights until leveling is needed If a light is on or comes on and remains on for 60 seconds the control box will relevel the coach using the original leveling procedure After leveling the vehicle the control box will return to the sleep mode EXCESS SLOPE During the leveling mode either initial ly or after a sleep mode if the coach cannot be leveled in 10 minutes after the system starts leveling in the raise mode the control box will stop all operations and the EXCESS SLOPE indicator will come on The box will remain on until the OFF button is pushed but will not go into a sleep mode If the system reached 15 minutes of accumulative time before the 10 minutes EXCESS SLOPE time the system will go to the SLEEP MODE even though a yellow LEVEL light may be on If any of the above does not occur see Part 6 of the REPAIR STEPS 7 TRAVEL MODE With the ignition on and leveling system off the coach should return to the proper travel height The travel solenoids are energized allowing the height control valves to function If the coach will not return to the proper ride height see Part 7 of the REPAIR STEPS 8 DUMP AND RAISE BUTTONS The DUMP AND RAISE buttons are for operator convenience They allow the coach to temporarily be raised or lowered to clear obstacles while mov ing These are momentary buttons When released the coach will return to ride height if the ignition is on These buttons will operate with the system o
27. th Trouble Shooting Steps NOTE HWH CORPORATION ASSUMES NO LIABILITY FOR DAMAGES OR INJURIES RESULTING FROM THE INSTALLATION OR REPAIR OF THIS PRODUCT 1 The trouble shooting guide must be followed in order Prob lems checked for in one step are assumed correct and not checked again in following steps 2 Batteries should be in good condition and fully charged Low voltage can cause erratic operation 3 Do not replace the control box unless the repair steps say to replace it Otherwise the malfunctions may damage the new control box 4 If the control box is removed 12 ignition power must be applied to the travel solenoid wires GRAY 1700 in the front and GRAY 3700 in the rear air harnesses This will allow the height control valve to function See MP85451F of section 3 Diagrams POINT AIR LEVELING This manual can be used to diagnose problems with older 3 Point Air Leveling systems The difference is the front manual buttons control only one solenoid valve The side manual buttons control only the left rear or right rear solenoid valves There is only one front travel solenoid valve Side to side leveling is accomplished using only the rear air bags There are no pressure switches used on 3 Point Air Leveling systems This manual is intended for use by experienced mechanics with knowledge of air suspension and automotive electrical systems People with little or no experience with HWH leveling systems shou
28. the fuse for the travel solenoids A blown fuse indicates a shorted wire or solenoid valve Unplug one air harness at a time to determine which wire or manifold is shorted Then unplug the travel solenoid to determine a bad wire or valve If the fuse is not blown check the corresponding pins in the control box for the travel solenoids If 12 power is not present replace the control box If power is present check for power at the manifolds Then replace the solenoid valve for any bag that will not reinflate Note A bad height control valve can cause a ride height problem If replacing a travel solenoid valve does not fix the problem check for correct operation of the height control valve These buttons are extensions of the up and down arrows Check Part 4 a b and d of this section If these function properly replace the control box or touch pad Recheck Part 7 of this section If it is OK there may be a problem with the height control valves DIAGRAMS HEO REFER TO MP75 4555 TRAVEL SOLENOID VALVE 2 RIGHT amp LEFT MI91 206J 27APR00 AIR LINE CONNECTION DIAGRAM NEWAY FRONT WATER TRAP ASSEMBLY DIAGRAM
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