SIR Diagnostic Trouble Code Logic

Caution: In order to avoid deploying the air bag when troubleshooting the SIR system, use only the equipment specified and the Instructions given. Failure to use the specified equipment as instructed could cause air bag deployment, personal injury to you or someone else, or unnecessary SIR system repairs.

Use the diagnostic procedures in this service category to find SIR system malfunctions. This service category also contains information for repairing SIR system malfunctions. For best results, use the diagnostic tables, and follow the sequence listed below:
1. Perform the SIR Diagnostic System Check. All SIR diagnostics must begin with the SIR Diagnostic System Check. The SIR Diagnostic System Check checks for proper AIR BAG warning lamp operation. The SIR Diagnostic System Check verifies the ability of the inflatable restraint Diagnostic Energy Reserve Module (DERM) to communicate through the data link connector. The SIR diagnostic system check determines whether SIR diagnostic trouble codes exist.
2. Refer to the diagnostic table as directed by the SIR Diagnostic System Check. The diagnostic tables will help enable you to diagnose any SIR system malfunction. Bypassing these procedures may result in the following:
- Extended Diagnostic time
- Incorrect Diagnosis
- Incorrect Parts Replacement
3. Repeat the SIR Diagnostic System Check after you perform any repair or diagnostic procedures. This will verify that you correctly performed the repair. This will also ensure that no other malfunctions exist.