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Free to use workshop manual for your 2015+ Mk4 'ND' Mazda MX-5

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AIR BAG SYSTEM WARNING LIGHT DOES NOT ILLUMINATE [AIR BAG SYSTEM]

Description	Air bag system warning light does not illuminate while the air bag system is performing initialization.
Possible cause	Air bag system warning light circuit malfunction Air bag system warning light (LED) malfunction Instrument cluster malfunction Communication error between SAS control module and instrument cluster SAS control module malfunction

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT OTHER WARNING AND INDICATOR LIGHTS CIRCUIT IN INSTRUMENT CLUSTER Switch the ignition ON (engine off or on). Do other warning and indicator lights illuminate?	Yes	Go to the next step.
		No	Inspect the instrument cluster power supply system and ground system, then go to Step 3.
2	INSPECT DTCs IN SAS CONTROL MODULE Inspect the DTC for the SAS control module on-board diagnostic system. (See DTC INSPECTION [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)].) (See DTC INSPECTION [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].) Have DTCs been recorded in memory?	Yes	Perform the applicable DTC inspection, then go to Step 5. (See DTC TABLE [SAS CONTROL MODULE (STANDARD DEPLOYMENT CONTROL SYSTEM)].) (See DTC TABLE [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].)
		No	Go to the next step.
3	VERIFY WHERE MALFUNCTION IS IN WARNING LIGHTS INDICATION CIRCUIT OR ELSEWHERE Turn on all warning lights and indicator lights using the instrument cluster PID WL+IL of simulation function using the M-MDS. (See ACTIVE COMMAND MODES INSPECTION [INSTRUMENT CLUSTER].) Do other waning and indicator lights illuminate?	Yes	Go to the next step.
		No	Replace the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) Then go to Step 5.
4	INSPECT DTCs IN INSTRUMENT CLUSTER Inspect the DTC for the instrument cluster on-board diagnostic system. (See DTC INSPECTION [INSTRUMENT CLUSTER].) Have DTCs been recorded in memory?	Yes	Perform the applicable DTC inspection, then go to the next step. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
5	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR Switch the ignition off. Switch the ignition ON (engine off or on). Does the air bag system warning light operate properly?	Yes	Verify that there are no DTCs in the memory. If there are no DTCs, the troubleshooting is completed.
		No	Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.

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