Diagnostic System Check

Circuit Description
The ignition switch supplies Ignition 1 voltage to the Inflatable Restraint Sensing and Diagnostic Module (SDM) at terminal 10 using the AIR BAG Fuse. When the ignition switch is first turned to the RUN position, the SDM responds by flashing the AIR BAG warning lamp seven times, then turning it OFF, while performing tests on the SIR system.

Diagnostic Aids
You must diagnose the diagnostic trouble codes in the order specified by the SIR diagnostic system check. Failure to do so may result in the following:
^ Extended Diagnostic Time
^ Incorrect Diagnosis
^ Incorrect Parts Replacement

Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. This step checks to see if the AIR BAG warning lamp flashes seven times when the ignition switch is turned to the RUN position.
2. This step determines if the AIR BAG warning lamp stays ON at all times or if the AIR BAG warning lamp does not come ON.
3. This step checks to see if the AIR BAG warning lamp turns OFF after it had flashed seven times.
4. This step checks to see if there is a current DTC present.
5. This step determines if there is a problem in the serial data line or if there is a malfunctioning SDM.
6. This step checks to see if the stored DTCs are either current or history.
7. This step checks to see if there is a history DTC present.
8. This step checks to see if there is a problem in the serial data line.
9. This step refers to the appropriate DTC table diagnostic aids for diagnosis of the history DTCs.