Air Bag Systems: Technical Service Bulletins Troubleshooting Guide
Contents
1. ALIGN MARKS CLOCK SPRING CONNECTOR The clock spring connector is part of the combination switch The clock spring connector ensures uninterrupted electrical contact to the air bag module while allowing rotation of the steering wheel The clock spring connector and combination switch are serviced as an assembly Caution A Whenever the steering wheel is removed before reinstalling it set the clock spring connector as follows 1 Set the front wheels straight ahead 2 Turn the clock spring connector clockwise until it stops Do not force it 3 Return the connector 2 75 turns 4 Align marks on the clock spring connector to the outer housing 1990 Mazda MX 5 Miata L4 1597cc 1 6L DOHC Qin AIR BAG SYSTEM WARNING LAMP DIAGNOSTIC MODULE BACKUP BATTERY DIAGNOSTIC MODULE BACKUP BATTERY AND AIR BAG SYSTEM WARNING LAMP Diagnostic Module The diagnostic module contains a microcomputer that moniters the electrical system components and connections The diagnostic module performs a self check of the electrical circuit and activates the warning lamp if a fault is detected System electrical faults can be determined by the coded warning lamp displays If a fault occurs in the system and the warning lamp is malfunctioning an audible alarm built into the diagnostic module will sound to indicate the need for service The system down fuse in the diagnostic module is burned for fail safe within 1 minute of one of the circuits between the diagnostic m2. C eee 1990 Mazda MX 5 Miata L4 1597cc 1 6L DOHC Gq o Air Bag Systems Technical Service Bulletins Troubleshooting Guide Work flaw Turn ignition switch ON from OFF Check air bag system warning lamp operation Warning lamp comes on then goes off approx 6 sec from igni tion switch turned ON Warning lamp does not come on Warning lamp flashes or remains on Check following possible causes Fuses burned out Warning lamp burned out a Disconnected diagnostic module Open circuit between warning lamp and diagnostic module Repair as specified or replace Check out failed part by recommended procedure Work Flow Check if horn sound If horn does not sound remove air Check system by referring to flash code table See below bag module and reconnect module connectors Troubleshooting Procedure Troubleshooting of the air bag system is performed using the coded flashing of the air bag system warning lamp The number of times the the warning lamp flashes is based on the type of fault being detected Codes are prioritized in such a way that if two or more faults occur at the same time the highest priority fault indication will dominate until corrected Faulty diagnostic module or poor connec 1 tion of diagnostic module connector See page T 139 Open circuit or poor connection of power 2 source Circuit Sea page T 140 Faulty D sensor D sensor remains ON 3 See page T 142 Faul
3. odule and either of the D sensors being grounded Backup Battery The backup battery stores sufficient power to operate the air bag system if battery power is lost during a crash The back up battery momentarily holds enough charge to trigger the igniter after the current supply has been interrupted If wili not hold a charge indefinitely Air Bag System Warning Lamp The air bag system warning lamp is located in the instrument cluster The warning lamp indicates a problem or failure of the air bag system If the air bag system is operating properly the warning lamp comes on when turning the ignition switch ON and goes out after approximately 6 seconds If the warning lamp fails to come on fails to go off or flashes there is a problem in the air bag system and it must be checked by the recomended procedure
4. ty diagnostic module 4 System down fuse burned See page T 143 Flashes four times Faulty S sensor 5 See page T 144 Flashes six times Faulty air bag module or poor cannection 6 ot clock spring connector See page T 146 7 Flashes eight times Poor ground of D sensor 7 See page T 148 Flashes nine times 3 See page T 142 a ade resale Open circuit between diagnostic module and 0 sensor Poor ground of all O sensors 7 See page T 148 Flash Code Table Note A in the air bag system Flash code table When the ignition switch is turned ON an audible alarm may be heard If so it indicates a simultaneous warning lamp failure and a problem 1990 Mazda MX 5 Miata L4 1597ce 1 6L DOHC AIR BAG SYSTEM STRUCTURAL VIEW 1 Air bag module 2 Steering wheel 3 Clock spring connector 4 Diagnostic module 5 Crush sensor a D sensor RH b _D sensor CNT c D sensor LH d S sensor 6 Backup battery The MX 5 Miata is equipped with a driver side supplementary air bag system a first for Mazda vehicles The air bag system is designed to provide increased accident protection for the driver when used in conjuction with the provided seat belt system For optimum protection the seat belts should be used by all vehicles occupants 1990 Mazda MX 5 Miata L4 1597cc 1 6L DOHC i a NS RETURN COUNTERCLOCKWISE 2 75 TURNS ALIGNMENT MARKS
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