NO.1 AIR BAG SYSTEM WARNING LIGHT DOES NOT ILLUMINATE


BHE080301046W02

1

Air bag system warning light does not illuminate.

DETECTION CONDITION

Malfunction in air bag system warning light circuit (short to body ground)

POSSIBLE CAUSE

• SAS unit malfunction
• Instrument cluster (circuit board) malfunction
• Short to body ground circuit in wiring harness between instrument cluster and 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, verfy that connectors, terminals and wiring harness are connected correctly and undamaged.

STEP

INSPECTION

ACTION

1

INSPECT OTHER WARNING AND INDICATOR LIGHTS CIRCUIT IN INSTRUMENT CLUSTER

• Turn the ignition switch to the ON position.
• Do other warning and indicator lights illuminate?
Yes
Turn the ignition switch to the LOCK position, then go to the next step.
No
Inspect instrument cluster power supply system and ground system the, then go to Step 4.
2

INSPECT SAS UNIT

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.
• 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 trim.
• Disconnect the driver- and passenger-side pre-tensioner seat belt connectors.
• Partially peel back the floor covering.
• Disconnect all SAS unit connectors.
• Connect the negative battery cable.
• Turn the ignition switch to ON position.
• Does the air bag system warning light illuminate?
Yes
Replace the SAS unit, then go to Step 4.
No
Go to the next step.
*3

INSPECT WIRING HARNESS BETWEEN SAS UNIT AND INSTRUMENT CLUSTER FOR SHORT TO GROUND

• Turn the ignition switch to LOCK position.
• Disconnect the negative battery cable.
• Disconnect the instrument cluster connector.
• Is there continuity between terminal 2K of the instrument cluster connector and ground?
Yes
Replace the wiring harness, then go to Step 4.
No
Replace the instrument cluster, then go to next step.
4

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 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.