Air Bag Indicator Circuit Malfunction (Driver)

Air Bag Indicator Circuit Malfunction (Driver)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Description

When the ignition is turned ON, during the bulb check, the driver air bag indicator will flash, and then turn OFF after the bulb check. The inflatable restraint sensing and diagnostic module (SDM) performs diagnostic tests on the SIR system during the bulb check. If any malfunction exists the SDM will request the instrument cluster to illuminate the air bag indicator steady, via serial data. If a preexisting malfunction exists, the air bag indicator will illuminate steady immediately after the ignition is turned ON. If the ignition 1 voltage is outside of the normal operating voltage range of 9-16 V, the SDM will command the instrument cluster to illuminate the air bag indicator ON, even with no DTCs present, and then disable all deployment loops.

Diagnostic Aids

* A DTC B1370 may set if the ignition 1 circuit is outside the 9-16 V range.
* A flashing driver air bag indicator is displayed if the inflatable restraint sensing and diagnostic module was programmed but did not fully complete the programming. For a flashing driver airbag indicator, refer to Inflatable Restraint Sensing and Diagnostic Module Programming and Setup Testing and Inspection.

Reference Information
Schematic Reference

SIR Schematics [1][2]Air Bag Systems
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

SIR System Description and Operation SIR System
Electrical Information Reference

* Circuit Testing Circuit Testing
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Connector Repairs Connector Repairs
* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Verify SDM DTCs are not set.

• If SDM DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.

• If SDM DTCs are not set

2. Verify the driver air bag indicator is not flashing.

• If the indicator is flashing
Refer to Inflatable Restraint Sensing and Diagnostic Module Programming and Setup Testing and Inspection

• If the indicator is not flashing

3. Verify the air bag indicators turn ON and OFF when commanding the Instrument Cluster All Indicators ON and OFF with a scan tool.

• If the air bag indicator does not turn ON or OFF
Replace the P16 instrument cluster.

• If the air bag indicator does turn ON or OFF

4. Replace the K36 inflatable restraint sensing and diagnostic module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs
* Control Module References Control Module References for instrument cluster or SDM replacement, programming and setup