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

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Description

•  After switching the ignition ON (engine off or on), the air bag system warning light turns on and remains on after approx. 6 s have elapsed.

Possible cause

•  DTCs are stored in the PCM. •  Battery malfunction •  Generator system malfunction •  SAS control module connector or terminal malfunction •  SAS control module power supply circuit malfunction ―  Short to ground in the wiring harness between MAIN 200 A fuse and SAS control module terminal 1AE ―  SRS1 7.5 A fuse malfunction ―  MAIN 200 A fuse malfunction ―  IG1 relay No.1 malfunction ―  Open circuit in the wiring harness between battery positive terminal and SAS control module terminal 1AE •  SAS control module malfunction •  Instrument cluster malfunction •  Malfunction in CAN line between the SAS control module and instrument cluster •  SAS control module body ground circuit malfunction ―  Open circuit in wiring harness between SAS control module terminal 1O and body ground ―  Open circuit in wiring harness between SAS control module terminal 1L and body ground

System Wiring Diagram

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Diagnostic Procedure

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 [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See AIR BAG SYSTEM SERVICE CAUTIONS [STANDARD DEPLOYMENT CONTROL SYSTEM].)

(See AIR BAG SYSTEM SERVICE WARNINGS [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) (See AIR BAG SYSTEM SERVICE CAUTIONS [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)

(See ACTIVE BONNET SERVICE WARNINGS.) (See ACTIVE BONNET SERVICE CAUTIONS.)

Step	Inspection		Action
1	INSPECT IG1 RELAY No.1 •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Remove the IG1 relay No.1. (See RELAY LOCATION.) •  Inspect the IG1 relay No.1. (See RELAY INSPECTION.) •  Is the IG1 relay No.1 normal?	Yes	Go to the next step.
		No	Replace the IG1 relay No.1, then go to Step 13.
2	INSPECT PCM DTC •  Perform the PCM DTC inspection using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-D 2.2)].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
		No	Go to the next step.
3	INSPECT BATTERY •  Inspect the battery. (See BATTERY INSPECTION.) •  Is the battery normal?	Yes	Go to the next step.
		No	Replace or charge the battery. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-D 2.2].) (See BATTERY RECHARGING.) Then go to Step 13.
4	INSPECT GENERATOR •  Inspect the generator. (See GENERATOR INSPECTION [WITHOUT i-ELOOP (SKYACTIV-D 2.2)].) (See GENERATOR INSPECTION [WITH i-ELOOP (SKYACTIV-D 2.2)].) •  Is the generator normal?	Yes	Go to the next step.
		No	Replace the generator, then go to Step 13. (See GENERATOR REMOVAL/INSTALLATION [WITHOUT i-ELOOP (SKYACTIV-D 2.2)].) (See GENERATOR REMOVAL/INSTALLATION [WITH i-ELOOP (SKYACTIV-D 2.2)].)
5	VERIFY THAT SAS CONTROL MODULE CONNECTOR IS CONNECTED •  Switch the ignition off. •  Disconnect the negative battery terminal and wait for 1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Verify the condition of the SAS control module connectors. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Are all SAS control module connectors securely connected?	Yes	Go to the next step.
		No	Reconnect the connector properly, then go to Step 13.
6	VERIFY THAT INSTRUMENT CLUSTER CONNECTOR IS CONNECTED •  Remove the instrument cluster. (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 13.
7	INSPECT DTCs IN SAS CONTROL MODULE •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL 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 (STANDARD DEPLOYMENT CONTROL SYSTEM)].) (See CLEARING DTC [SAS CONTROL MODULE (TWO-STEP DEPLOYMENT CONTROL SYSTEM)].) •  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 13. (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.
8	INSPECT DTCs IN INSTRUMENT CLUSTER •  Inspect the DTC for the instrument cluster on-board diagnostic system. (See DTC INSPECTION [INSTRUMENT CLUSTER].) •  Are the any DTCs present?	Yes	Perform the applicable DTC inspection, then go to Step 13. (See DTC TABLE [INSTRUMENT CLUSTER].)
		No	Go to the next step.
9	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 13.
10	VERIFY SAS CONTROL MODULE CONNECTOR CONDITION •  Switch the ignition off. •  Disconnect the negative battery terminal and wait for 1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION.) •  Disconnect the clock spring connector. (See CLOCK SPRING REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See CLOCK SPRING REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.) •  Disconnect the passenger-side air bag module connector. (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See PASSENGER-SIDE AIR BAG MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Disconnect the driver and passenger-side seat connectors. (See FRONT SEAT REMOVAL/INSTALLATION.) •  Remove the B-pillar lower trim. (See B-PILLAR LOWER TRIM REMOVAL/INSTALLATION.) •  Disconnect the driver and passenger-side pre-tensioner seat belt connectors. (See FRONT 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 [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].) •  Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. •  Is the connector normal?	Yes	Go to the next step.
		No	Replace the air bag harness, then go to Step 13.
11	INSPECT POWER SUPPLY CIRCUIT OF SAS CONTROL MODULE •  Verify that the SAS control module connectors are disconnected. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on). •  Measure the voltage at SAS control module at wiring harness-side connector terminal 1AE. •  Is the voltage 8 .1V—15.9V?	Yes	Go to the next step.
		No	Inspect the SRS1 7.5 A fuse and MAIN 200 A fuse. •  If a fuse is blown: ―  Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and MAIN 200A fuse. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has a short to ground. ―  Replace the fuse. •  If a fuse is damaged: ―  Replace the fuse. •  If the fuse is normal: ―  Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and SAS control module terminal 1AE. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a open circuit. •  Repair or replace the malfunctioning part. If there is no common connector: •  Repair or replace the wiring harness which has a open circuit. Go to Step 13.
12	INSPECT SAS CONTROL MODULE BODY GROUND CIRCUIT FOR OPEN CIRCUIT •  SAS control module connectors are disconnected. •  Switch the ignition off. •  Disconnect the negative battery terminal and wait for 1 min or more. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Inspect for continuity between the following terminals (wiring harness-side) and body ground: ―  SAS control module terminal 1O ―  SAS control module terminal 1L Note •  Inspect for continuity while shaking the wiring harness between the SAS control module and body ground. •  Is there continuity?	Yes	Go to the next step.
		No	Refer to the wiring diagram and verify whether or not there is a common connector between SAS control module terminal and body ground. If there is a common connector: •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. •  Replace the malfunctioning part. If there is no common connector: •  Replace the wiring harness which has an open circuit. Go to the next step.
13	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR •  Connect the SAS control module connectors. •  Reconnect all disconnected connectors. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL 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	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 the malfunction recurs, replace the SAS control module. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [STANDARD DEPLOYMENT CONTROL SYSTEM].) (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM].)