Diagnostic System Check

CAUTION:
^ Refer to SIR Special Tool Caution in Service Precautions.
^ 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 Disabling the SIR System under Air Bag(s) Arming and Disarming.

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 perform the following tasks:
1. Remove all water.
2. Repair the water damage.
3. Replace the SDM harness connector.
4. Replace the SDM.

Failure to follow these tasks 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. 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. Refer to the diagnostic table as directed by the Diagnostic System Check - SIR. The diagnostic tables will help you to diagnose any SIR system malfunction. Bypassing these procedures may result in the following:
^ Extended Diagnostic Time
^ Incorrect Diagnosis
^ Incorrect Parts Replacement

2. Repeat the Diagnostic System Check - SIR after you perform any repair or diagnostic procedures. This will verity that you correctly performed the repair. This will also ensure that no other malfunctions exist.

TEST DESCRIPTION

Steps 1-5:

The numbers below refer to the step numbers on the diagnostic table.
1. Tests to see if the AIR BAG indicator flashes seven times when the ignition is turned ON. The AIR BAG indicator should turn OFF after flashing seven times.
2. Tests to see if the scan tool powers up.
3. Tests to see if the scan tool can communicate with the Inflatable Restraint Sensing And Diagnostic Module (SDM).
4. Tests to see if there are current or history Diagnostic Trouble Codes (DTCs) present.
5. Tests to see if DTC 55 (Internal SDM Malfunction) is present.