NO.1 AIR BAG SYSTEM WARNING LIGHT DOES NOT ILLUMINATE

2008 - MX-5 - Restraints

NO.1 AIR BAG SYSTEM WARNING LIGHT DOES NOT ILLUMINATE

1	Air bag system warning light does not illuminate.
DETECTION CONDITION	Malfunction in air bag system warning light circuit (short to ground)
POSSIBLE CAUSE	SAS control module malfunction Instrument cluster (circuit board) malfunction Short to ground circuit in wiring harness between instrument cluster and SAS control module

Diagnostic Procedure

When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunction. If there is a problem, verify that connectors, terminals and wiring harness are connected correctly and undamaged.


STEP	INSPECTION		ACTION
1	INSPECT OTHER WARNING AND INDICATOR LIGHTS CIRCUIT IN INSTRUMENT CLUSTER Turn the ignition switch to the ON position. Do other warning and indicator lights illuminate?	Yes	Turn the ignition switch to the LOCK position, then go to the next step.
1		No	Inspect instrument cluster power supply system and ground system the, then go to Step 4.
2	INSPECT SAS CONTROL MODULE WARNING: Handling the air bag system components improperly can accidentally deploy the air bag modules and pre-tensioner seat belts, which may seriously injure you. Read the air bag system service warnings and cautions before handling the air bag system components. (See AIR BAG SYSTEM SERVICE WARNINGS.) (See AIR BAG SYSTEM SERVICE CAUTIONS.) Turn the ignition switch to LOCK position. Remove the battery cover. Disconnect the negative battery cable and wait for 1 min or more. (See BATTERY REMOVAL/INSTALLATION [LF].) Remove the column cover. Disconnect the clock spring connector. Remove the glove compartment. Disconnect the passenger-side air bag module connector. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.) Disconnect the driver and passenger‐side seat connectors. Remove the back trim. Disconnect the driver‐ and passenger‐side pre‐tensioner seat belt connectors. Disconnect all SAS control module connectors. Connect the negative battery cable. Turn the ignition switch to ON position. Does the air bag system warning light illuminate?	Yes	Replace the SAS control module, then go to Step 4. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
2		No	Go to the next step.
*3	INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND INSTRUMENT CLUSTER FOR SHORT TO GROUND Turn the ignition switch to LOCK position. Remove the battery cover. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [LF].) Disconnect the instrument cluster connector. Is there continuity between terminal 2K of the instrument cluster connector and ground?	Yes	Replace the wiring harness, then go to Step 4.
*3		No	Replace the instrument cluster, then go to the next step. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
4	CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR Turn the ignition switch to LOCK position. Remove the battery cover. Disconnect the negative battery cable and wait for 1 min or more. (See BATTERY REMOVAL/INSTALLATION [LF].) Connect all SAS control module connectors. Connect the driver and passenger-side pre-tensioner seat belt connectors. Connect the driver and passenger‐side seat connectors. Connect the passenger‐side air bag module connector. Connect the clock spring connector. Connect the negative battery cable. Turn the ignition switch to ON position. Does the air bag system warning light operate properly?	Yes	Complete troubleshooting, then explain repairs to customer.
4		No	Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.

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