Diagnostic System Check

Circuit Description
The ignition switch supplies Ignition Positive 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 BG warning lamp 7 times, then turning the lamp 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 conditions:
^ Extended Diagnostic Time
^ Incorrect Diagnosis
^ Incorrect Parts Replacement

Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. Attempt to establish communication with the Inflatable Restraint Sensing and Diagnostic Module (SDM) using a scan tool.
2. Attempt to establish communication with the powertrain control module (PCM). This checks to see if other modules not communicating.
3. This test checks for any SDM DTCs.
4. The AIR BAG warning lamp should flash seven times after the ignition switch is first turned to the RUN position.
5. The AIR BAG warning lamp indicates improper operation. This test differentiates a warning lamp stays ON condition from a warning lamp does not come ON condition.