When the ignition is turned ON, the instrument panel cluster (IPC) flashes the SIR Air Bag warning 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 IPC to illuminate the air bag warning indicator steady, via serial data. If a preexisting malfunction exists, the air bag warning 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 SDM will command the IPC to illuminate the air bag warning indicator with no DTCs present, then disables all deployment loops.

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. Ignition ON, with a scan tool, verify the Battery Voltage Signal Parameter is 9-16 volts.

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

2. Ignition OFF, observe the SIR Air Bag warning indicator while turning the ignition ON. The SIR warning indicator should flash 7 times and then turn OFF.

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

⇒	If the SIR warning indicator remains on steady, test for Current DTCs. Refer to Diagnostic Trouble Code (DTC) List - Vehicle.

3. Ignition ON, with a scan tool command the I/P indicators ON and OFF. The Air Bag indicator should turn ON and OFF when changing between the commanded states.

⇒	If the air bag indicator does not illuminate as expected, replace the IPC.

4. If all tests are normal, replace the SDM.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.