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, the Instrument Cluster flashes the SIR system AIR BAG indicator 7 times for a bulb check. The Inflatable Restraint Sensing and Diagnostic Module performs diagnostic tests on the SIR system during the bulb check. If any malfunction exists the Inflatable Restraint Sensing and Diagnostic Module will request the Instrument Cluster to illuminate the SIR system AIR BAG indicator steady, via serial data. If a preexisting malfunction exists, the SIR system 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 9-16 volts, the Inflatable Restraint Sensing and Diagnostic Module will request the Instrument Cluster to illuminate the SIR system AIR BAG indicator with no DTCs present, then disables all deployment loops.

Diagnostic Aids

A DTC B1370 may set if the ignition 1 circuit is outside the 9-16 volts range.

Reference Information

Schematic Reference

SIR Schematics [1][2]Air Bag Systems

Connector End View Reference

Component Connector End Views 5 Bow Lowered Switch (CM7)

Description and Operation

SIR System Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition ON, verify the scan tool Battery Voltage parameter is 9-16 volts.

• If not within the specified range, refer to Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle.

2. Cycle the ignition from OFF to ON while observing the Instrument Cluster. The SIR warning indicator should flash then turn OFF.

• If the SIR warning indicator continually flashes, reprogram the Inflatable Restraint Sensing and Diagnostic Module.

3. With a scan tool, perform the Instrument Cluster Display Test. The SIR system AIR BAG indicator should turn ON and OFF as commanded.

• If the SIR system AIR BAG indicator does not cycle between the commanded states, replace the Instrument Cluster.

4. If all circuits test normal, replace the Inflatable Restraint Sensing and Diagnostic Module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* SIR/SRS Wiring Repairs SIR/SRS Wiring Repairs

* Control Module References Control Module References for Instrument Cluster or Inflatable Restraint Sensing and Diagnostic Module replacement, setup, and programming