Diagnostic System Check

DIAGNOSTIC SYSTEM CHECK - RESTRAINT SYSTEMS

CAUTION:
- Refer to SIR Special Tool Caution in Service Precautions.
- If the vehicle interior is exposed to moisture and becomes soaked up to the level of the sensing and diagnostic module (SDM), the SDM and SDM harness connector must be replaced. The SDM could be activated when powered, which could cause airbag deployment and result in personal injury.

These diagnostic procedures will help you to find and repair 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-Restraint Systems. 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-Restraint Systems 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.

Test Description

Step 1 - 5:

The numbers below refer to the step numbers on the diagnostic table.
2. This step checks to see if the scan tool is able to communicate with the inflatable restraint sensing and diagnostic module (SDM).
4. This step checks to see if there are communication DTCs, or U-codes, present.