NO.2 AIR BAG SYSTEM WARNING LIGHT ILLUMINATES CONSTANTLY

id080300800300

2
Air bag system warning light is illuminated constantly.
DETECTION CONDITION
Malfunction in air bag system warning light circuit (open circuit or short to power supply).
POSSIBLE CAUSE
•  Weak battery
•  SAS control module malfunction
•  Instrument cluster (circuit board) malfunction
•  No connection in SAS control module connector
•  Poor contact in instrument cluster connector (16-pin)
•  Open or short to power supply circuit in wiring harness between instrument cluster and SAS control module
•  Poor contact at terminals 1X and/or 1W of SAS control module connector
•  Poor contact in wiring harness between terminal 1X of SAS control module connector and ground
•  Poor contact in wiring harness between battery and terminal 1W of 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 BATTERY
•  Measure the voltage of battery.
•  Is the voltage 9 V or more?
Yes
Go to the next step.
No
Battery is weak.
Inspect charge/discharge system, then go to Step 9.
(See BATTERY INSPECTION [WLT-1, WLT-2, WL-C, WE-C].)
2
VERIFY THAT SAS CONTROL MODULE CONNECTOR IS CONNECTED
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.
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the console.
•  Are all SAS control module connectors securely connected?
Yes
Go to the next step.
No
Reconnect the connector properly, then go to Step 9.
* 3
INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND INSTRUMENT CLUSTER FOR CONTINUITY
•  Remove the column cover.
•  Disconnect the clock spring connector.
•  Remove the glove compartment.
•  Disconnect the passenger-side air bag module connector.
•  Disconnect the driver and passenger-side seat connectors.
•  Disconnect the driver- and passenger-side pre-tensioner seat belt connectors.
•  Remove the console.
•  Disconnect all SAS control module connectors.
•  Disconnect the instrument cluster connector.
•  Is there continuity between SAS control module connector (20-pin) terminal 1T and instrument cluster connector terminal 1H?
Yes
Go to the next step.
No
Replace the wiring harness, then go to Step 9.
* 4
INSPECT WIRING HARNESS BETWEEN SAS CONTROL MODULE AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY
•  Connect the negative battery cable.
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to ON position.
•  Measure the voltage at instrument cluster connector terminal 1H.
•  Is the voltage 9 V or more?
Yes
Replace the wiring harness, then go to Step 9.
No
Go to the next step.
5
CHECK TO SEE WHETHER MALFUNCTION IS IN AIR BAG SYSTEM WARNING LIGHT IN INSTRUMENT CLUSTER
•  Connect instrument cluster connector terminal 1H to ground, then reconnect the connector
•  Does the air bag system warning light illuminate with engine switch ON?
Yes
Replace the instrument cluster, then go to Step 9.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
No
Go to the next step.
6
INSPECT POWER SUPPLY CIRCUIT OF SAS CONTROL MODULE (TERMINAL (20-pin) 1W)
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  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.
•  Inspect the voltage for PID/DATA monitor “IG_V_2” item using M-MDS.
•  Is the voltage of at least one terminal 9 V or more?
Yes
Go to the Step 8.
No
Go to the next step.
7
INSPECT WIRING HARNESS BETWEEN BATTERY AND FUSE BLOCK
•  Connect the negative battery cable.
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to ON position.
•  Measure the voltage at instrument cluster connector terminal 2A.
•  Is the voltage 9 V or more?
Yes
Go to the next step.
No
Repair the wiring harnesses, then go to Step 9.
8
VERIFY THAT SAS CONTROL MODULE CONNECTOR TERMINAL 1X IS GROUND
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  Remove the column cover.
•  Disconnect the clock spring connector.
•  Remove the glove compartment.
•  Disconnect the passenger-side air bag module connector.
•  Disconnect the driver and passenger-side side air bag module connectors.
•  Disconnect the driver and passenger-side pre-tensioner seat belt connectors.
•  Remove the console.
•  Disconnect all SAS control module control model connectors.
•  Inspect the wiring harness between SAS control module connector (20-pin) terminal 1X and ground for the following:
―  Short to power supply
―  Open circuit
•  Is the wiring harness normal?
Yes
Replace the SAS control module, then go to the next step.
(See SAS CONTROL MODULE REMOVAL/INSTALLATION.)
No
Replace the wiring harnesses, then go to the next step.
9
CONFIRM THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to LOCK position.
•  Disconnect the negative battery cable and wait for 1 min or more.
•  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 instrument cluster connector.
•  Connect the negative battery cable.
•  Turn the ignition (F2, G6)/engine (WLT-1, WLT-2, WL-C, WE-C) switch to ON position.
•  Does the air bag system warning light operate properly?
Yes
Complete troubleshooting, then explain repairs to customer.
No
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.