Important: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

When the ignition is turned ON, the instrument panel cluster (IPC) flashes the AIR BAG indicator seven times. The inflatable restraint sensing and diagnostic module (SDM) performs diagnostic tests on the SIR system and then commands the IPC to turn the AIR BAG indicator OFF if no SIR malfunction exists. The AIR BAG indicator is controlled by the SDM via serial data communications. If the ignition 1 voltage is outside of the normal operating voltage range 9-16 volts, the SDM will command the IPC to turn the AIR BAG indicator ON with no diagnostic trouble codes (DTCs) present then disables all deployment loops.

Schematic Reference

SIR Schematics

Connector End View Reference

SIR Connector End Views

1. Ignition ON, use the scan tool to request the SIR data list display. Observe the Battery Voltage Parameter. The battery voltage on the scan tool should read 9-16 volts.

⇒	If the voltage is less than 9 volts refer to Diagnostic System Check - Vehicle .

2. Using the scan tool go to Body and Accessories, then go onward to Special Functions to Instrument Panel Cluster, and then go to Display Test. In the Display Test mode you can turn ON or OFF all the instrument panel indicators when commanded ON. Commanded the IPC indicators ON. The Air Bag indicator should turn ON.

⇒	If the Air Bag indicator does not turn ON replace the IPC.

⇒	Note: The AIR BAG warning indicator is not serviceable separately. The IPC must be serviced/replaced as a complete unit.

3. Replace the SDM.

Important: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for IPC and SDM replacement, setup, and programming.