Caution: Refer to SIR Special Tool Caution in the Preface section.
Caution: 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:
- 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:
- Repeat the diagnostic system check - SIR after you perform any repair or diagnostic procedure. This will verify that you correctly performed the repair. This will also ensure that no other malfunctions exist.
| • | Extended Diagnostic Time |
| • | Incorrect Diagnosis |
| • | Incorrect Parts Replacement |
Test Description
The number below refers to the step numbers on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: SIR Schematics | |||
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications |
Does the scan tool communicate with the SDM? | Go to Step 3 | Go to Scan Tool Does Not Communicate with Sensing and Diagnostic Module in Data Link Communications | |
3 | Select the SIR display DTCs function on the scan tool. Does the scan tool display any DTCs? | Go to Symptoms - SIR | |
