When the ignition is turned ON, the instrument panel cluster (IPC) flashes the AIRBAG 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 AIRBAG indicator steady, via serial data. If a preexisting malfunction exists, the AIRBAG 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 AIRBAG 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

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

1. Ignition ON, observe the function of the air bag indicator lamp, the indicator lamp will flash 7 times and turn OFF.

⇒	If the air bag indicator continuously illuminates, check the serial data signal circuit for a short to ground or an open/high resistance.

⇒	If the air bag indicator continually flashes, program the SDM.

2. Command the IPC indicators ON and OFF with a scan tool, all IPC indicators including the air bag indicator should turn ON and OFF while changing between the commanded states.

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

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.