Caution: Refer to SIR Special Tool Caution in the Preface section.
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 procedures. This will verify that you correctly performed the repair, and will also ensure that no other malfunctions exist.
| • | Extended Diagnostic Time |
| • | Incorrect Diagnosis |
| • | Incorrect Parts Replacement |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
This step checks to see if the scan tool is able to communicate with the inflatable restraint sensing and diagnostic module (SDM).
-
This step checks to see if there are communication DTCs, or U-codes, present.
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 Class 2 Device in Data Link Communications | |
3 | Select the SIR display DTCs function on the scan tool. Does the scan tool display any DTCs? | Go to Step 4 | Go to Symptoms - SIR |
Does the scan tool display any DTCs which begin with a "U"? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 5 | |
5 | Does the scan tool display DTC B1000? | Go to Diagnostic Trouble Code (DTC) List in Body Control System | |
