When the ignition is turned ON, the instrument panel cluster flashes the air bag indicator 7 times for a 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 panel 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 9-16 V, the SDM will command the instrument panel cluster to illuminate the air bag indicator ON with no DTCs present, then disables all deployment loops.

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

Schematic Reference

SIR Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

SIR System Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for scan tool information

1. Verify SDM DTCs are not set.

⇒	If any DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle.

2. Ignition ON, monitor the instrument panel cluster. The SIR warning indicator should flash then turn OFF.

⇒	If the SIR warning indicator continually flashes, program the K36 SDM.

3. Perform the Display Test in the Instrument Panel Cluster/Special Functions. The Air Bag indicator should turn ON and OFF as commanded.

⇒	If the air bag indicator does not illuminate as expected, replace the P16 instrument panel cluster.

4. If all circuits test normal, replace the K36 SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.