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:
• | Extended Diagnostic Time |
• | Incorrect Diagnosis |
• | Incorrect Parts Replacement |
The numbers below refer to the step numbers on the diagnostic table.
This step 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 7 times.
This step tests to see if the scan tool powers up.
This step tests to see if the scan tool can communicate with the inflatable restraint sensing and diagnostic module (SDM).
This step tests to see if there are current or history diagnostic trouble codes (DTCs) present.
This step tests to see if there are communication DTCs, or U-codes, present.
This step tests to see if an ECU Malfunction, DTC B1000, is present.
Step | Action | Yes | No |
---|---|---|---|
Note the AIR BAG indicator while turning ON the ignition. Does the AIR BAG indicator flash 7 times? | Go to Step 2 | Go to Symptoms - SIR | |
Install a scan tool. Does the scan tool power up? | Go to Step 3 | Go to Scan Tool Does Not Power Up in Data Link Communications | |
Attempt to establish communication with the SDM. Does the scan tool communicate with the SDM? | Go to Step 4 | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | |
Does the scan tool display any current or history DTCs? | Go to Step 5 | System OK | |
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 6 | |
Does the scan tool display DTC B1000? | Go to DTC B1000 in Body Control System |