SIR Diagnostic Flow

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.

CAUTION: If any water enters the vehicle's interior up to the level of the carpet or higher and soaks the carpet, the Sensing and Diagnostic Module (SDM) and the SDM harness connector may need to be replaced. The SDM could be activated when powered, which could cause deployment of the air bag(s) and result in personal injury. Before attempting these procedures, the SIR system must be disabled. Refer to Air Bag(s) Arming and Disarming for instructions on how to disable the SIR system. With the ignition OFF, inspect the SDM mounting area, including the carpet. If any significant soaking or evidence of significant soaking is detected, you MUST:
^ Remove all water
^ Repair the water damage
^ Replace the SDM harness connector
^ Replace the SDM

Failure to follow these procedures could result in possible air bag deployment, personal injury, or otherwise unneeded SIR system repairs.

These diagnostic procedures will help you to find and repair SIR system malfunctions. To get the best results, it is important to use the Diagnostic tables and follow the sequence listed below.
1. Perform the SIR Diagnostic System Check. The SIR Diagnostic System Check must be the starting point of any SIR diagnostics. The SIR Diagnostic System Check checks for proper AIR BAG warning lamp operation, the ability of the Sensing and Diagnostic Module (SDM) to communicate through the serial data line and whether SIR diagnostic trouble codes exist.
2. Refer to the proper diagnostic table as directed by the SIR Diagnostic System Check.
The SIR Diagnostic System Check will lead you to the correct table to diagnose any SIR system malfunctions. Bypassing these procedures may result in extended diagnostic time, incorrect diagnosis and incorrect parts replacement.
3. Repeat the SIR Diagnostic System Check after any repair or diagnostic procedures have been performed. Performing the SIR Diagnostic System Check after all repair or diagnostic procedures will make sure that you have done the correct repairs and that no other malfunctions exist.