AIR BAG SYSTEM WARNING LIGHT ILLUMINATES CONSTANTLY [AIR BAG SYSTEM]

id0803a3814400

Description

•  Air bag system warning light is illuminated constantly and remains illuminated after 6 s have elapsed.

Possible cause

•  Weak battery •  SAS control module connectors are poorly connected •  Instrument cluster connector is poorly connected •  SAS control module malfunction •  Instrument cluster malfunction •  SAS control module power supply circuit malfunction ―  Short to ground in wiring harness between SRS1 7.5 A fuse and SAS control module terminal 2AD ―  SRS1 7.5 A fuse malfunction ―  Open circuit in wiring harness between IG1 relay and SAS control module terminal 2AD

System Wiring Diagram

amxuuw00004185

Diagnostic Procedure

Step	Inspection		Action
1	INSPECT BATTERY •  Measure the voltage of battery. •  Is the voltage 8 V or more?	Yes	Go to the next step.
		No	Battery is weak. Inspect charge/discharge system, then go to Step 8. (See BATTERY INSPECTION.)
2	VERIFY THAT SAS CONTROL MODULE CONNECTOR IS CONNECTED Warning •  Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components. (See AIR BAG SYSTEM SERVICE WARNINGS.) (See AIR BAG SYSTEM SERVICE CAUTIONS.) (See ACTIVE BONNET SERVICE WARNINGS.) (See ACTIVE BONNET SERVICE CAUTIONS.) •  Switch the ignition off. •  Disconnect the negative battery cable and wait for 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Remove the back trim. (See BACK TRIM REMOVAL/INSTALLATION.) •  Are all SAS control module connectors securely connected?	Yes	Go to the next step.
		No	Reconnect the connector properly, then go to Step 8.
3	VERIFY THAT INSTRUMENT CLUSTER CONNECTOR IS CONNECTED •  Disconnect the instrument cluster connector. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) •  Are all instrument cluster connectors securely connected?	Yes	Go to the next step.
		No	Reconnect the connector properly, then go to Step 8.
4	INSPECT DTCs IN SAS CONTROL MODULE •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on). •  Clear the DTC for the SAS control module using the M-MDS. (See CLEARING DTC [SAS CONTROL MODULE (AIR BAG SYSTEM)].) •  Inspect the DTC for the SAS control module on-board diagnostic system. (See CLEARING DTC [SAS CONTROL MODULE (AIR BAG SYSTEM)].) •  Have DTCs been recorded in memory?	Yes	Perform the applicable DTC inspection, then go to Step 8. (See DTC TABLE [SAS CONTROL MODULE (AIR BAG SYSTEM)].)
		No	Go to the next step.
5	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 Step 8. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
6	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 warning and indicator lights illuminate?	Yes	Go to the next step.
		No	Repair the instrument cluster. (See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.) Then go to Step 8.
7	INSPECT POWER SUPPLY CIRCUIT OF SAS CONTROL MODULE (TERMINAL 2AD) Warning •  Handling the component parts improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the service warnings/cautions and the workshop manual before handling the air bag system components. (See AIR BAG SYSTEM SERVICE WARNINGS.) (See AIR BAG SYSTEM SERVICE CAUTIONS.) (See ACTIVE BONNET SERVICE WARNINGS.) (See ACTIVE BONNET SERVICE CAUTIONS.) •  Switch the ignition off. •  Disconnect the negative battery cable and wait for 1 min or more. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.) •  Disconnect the clock spring connector. (See CLOCK SPRING REMOVAL/INSTALLATION.) •  Remove the passenger-side lower panel. (See PASSENGER-SIDE LOWER PANEL REMOVAL/INSTALLATION.) •  Disconnect the passenger-side air bag module connector. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION.) •  Disconnect the driver and passenger-side seat connectors. (See SEAT REMOVAL/INSTALLATION.) •  Remove the back trim. (See BACK TRIM REMOVAL/INSTALLATION.) •  Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (See SEAT BELT REMOVAL/INSTALLATION.) •  Disconnect the active bonnet actuator connector. (See ACTIVE BONNET ACTUATOR REMOVAL/INSTALLATION.) •  Disconnect all SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION.) •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on). •  Measure the voltage at SAS control module at wiring harness-side connector terminal 2AD. •  Is the voltage 8 V—16V?	Yes	Go to the next step.
		No	Inspect the SRS1 7.5 A fuse. •  If a fuse is burnt out: ―  Repair or replace the wiring harness which is shorted to ground. ―  Replace the fuse. •  Replace the fuse. ―  Replace the fuse. •  If the fuse is normal: ―  Repair or replace the wiring harness which has an open circuit. Go to the next step.
8	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR •  Connect the SAS control module connectors. •  Reconnect all disconnected connectors. •  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on). •  Does the air bag system warning light illuminate for approx. 6 s and turn off?	Yes	Complete troubleshooting, then explain repairs to customer.
		No	Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.