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NO.2 AIR BAG SYSTEM WARNING LIGHT IS ILLUMINATED CONSTANTLY

BHE080301046W03

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 unit malfunction • Instrument cluster (circuit board) malfunction • No connection in SAS unit connector • Poor contact in instrument cluster connector (24-pin) • Open or short to power supply circuit in wiring harness between instrument cluster and SAS unit • Poor contact at terminals 1T, 1X and/or 1W of SAS unit connector • Poor contact in wiring harness between terminal 1X of SAS unit connector and ground • Poor contact in wiring harness between battery and terminal 1W of SAS unit

## 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)
2 | VERIFY THAT SAS UNIT 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 service warnings and cautions before handling the air bag system components. (See SERVICE WARNINGS.) (SeeSERVICE CAUTIONS.) • Turn the ignition switch to LOCK position. • Disconnect the negative battery cable and wait for 1 min or more. • Turn up the floor covering. • Are all SAS unit 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 UNIT 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 side air bag module connectors. • Disconnect the driver and passenger-side curtain air bag module connectors. • Remove the rear door lower trims. • Disconnect the driver- and passenger-side pre-tensioner seat belt connectors. • Partially peel back the floor covering. • Disconnect all SAS unit connectors. • Disconnect the instrument cluster connector. • Is there continuity between SAS unit connector terminal 1T and instrument cluster connector terminal 2K? | Yes | Go to the next step.
No | Replace the wiring harness, then go to Step 9.
* 4 | INSPECT WIRING HARNESS BETWEEN SAS UNIT AND INSTRUMENT CLUSTER FOR SHORT TO POWER SUPPLY • Connect the negative battery cable. • Turn the ignition switch to ON position. • Measure the voltage at instrument cluster connector terminal 2K. • 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 2K to ground, then reconnect the connector • Does the air bag system warning light illuminate with ignition 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 UNIT (TERMINAL 1W) • Turn the ignition switch to LOCK position. • Disconnect the negative battery cable and wait for 1 min or more. • Connect all SAS unit connectors. • Connect the driver and passenger-side pre-tensioner seat belt connectors. • Connect the driver and passenger-side curtain air bag module connectors. • Connect the driver and passenger-side side air bag module connectors. • Connect the passenger-side air bag module connector. • Connect the clock spring connector. • Inspect the voltage for PID/DATA monitor RCM_VOLT item using WDS or equivalent. • 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 switch to ON position. • Measure the voltage at instrument cluster connector terminal 1G. • 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 UNIT CONNECTOR TERMINAL 1X IS GROUND • Turn the ignition 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 curtain air bag module connectors. • Remove the rear door lower trims. • Disconnect the driver and passenger-side pre-tensioner seat belt connectors. • Partially peel back the floor covering. • Disconnect all SAS unit control model connectors. • Inspect the wiring harness between SAS unit connector terminal 1X and ground for the following: – Short to power supply – Open circuit • Is the wiring harness okay? | Yes | Replace the SAS unit, then go to the next step. (See SAS UNIT 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 switch to LOCK position. • Disconnect the negative battery cable and wait for 1 min or more. • Connect all SAS unit connectors. • Connect the driver and passenger-side pre-tensioner seat belt connectors. • Connect the driver and passenger-side curtain air bag module connectors. • Connect the driver and passenger-side side air bag module 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 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.