The ignition switch supplies battery voltage to the AIR BAG indicator using the AM2 fuse. The AIR BAG indicator is connected to the AIR BAG indicator control circuit of the sensing and diagnostic module (SDM). When the ignition switch is first turned to the ON position, the SDM responds by illuminating the AIR BAG indicator for approximately 6 seconds while performing diagnostic tests on the SIR system.

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 OFF, disconnect the SDM connector.
2. Turn the ignition ON, check for 8-16V at the SDM terminal 21 while operating the wipers, headlights and rear defogger.

⇒	If the voltage is not as specified, repair open, high resistance in the circuit.

3. Check for less than 1 ohm between the SDM terminals 25, 26 and a known good ground .

⇒	If the resistance is not as specified, repair open, high resistance in the circuit.

4. Ignition OFF, disconnect the IPC connector.
5. Check for 11-14V volt between terminals 32, 33 and a known good ground .

⇒	If the voltage is not as specified, repair open, high resistance in the circuit.

6. Check for less than 1 ohm between the IPC terminal 30 and a known good ground .

⇒	If the resistance is not as specified, repair open, high resistance in the circuit.

7. Ignition ON, observe the function of the air bag indicator lamp, the indicator lamp will illuminate for 6 seconds, go OFF for 10 seconds, then remain ON.

⇒	If the air bag indicator operates as specified, replace the SDM.

⇒	If the air bag indicator does not operate as specified, replace the IPC.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.