WARNING: To avoid accidental air bag deployment and possible personal injury, discharge the backup power source before repairing or replacing any Supplemental Restraint System (SRS) components. TO DISCHARGE THE BACKUP POWER SOURCE, DISCONNECT THE GROUND CABLE FROM THE BATTERY AND WAIT FOR TWO MINUTES. FAILURE TO FOLLOW THIS INSTRUCTION COULD RESULT IN INJURY.
CAUTION: Diagnostics by substituting a component from another vehicle is NOT permitted. Substituting control modules does not guarantee confirmation of the fault and, in addition, may cause additional faults in the vehicle being tested and/or in the vehicle from which the modules are removed.
NOTE: It is against the law to repair the air bag module electrical circuits if the restraint system is faulty. The suggestion to "REPAIR the electrical circuit" usually means replacing the wiring harness.
1. Conduct an external inspection for obvious signs of damage.
Electrical factors:
- Battery status and charging
- Make sure the airbag circuit electrical connectors are connected correctly.
- Wiring harness
- Airbag module(s)
- Make sure the restraint control module (RCM) is installed correctly.
- Fuse Box(s)
- Sensor(s)
- Pretensioner(s)
- Control lamp(s)
2. If an obvious cause for the problem you have identified or the customer has described is found, correct it (if possible) before proceeding further.
3. If the cause is not visually obvious, check the restraint control module (RCM) and the seat load classification system (OCS) module for DTCs and refer to the Diagnostic Trouble Code (DTC) Index.
Due to the complexity of the system and the potential for damage/injury, it is preferable to use a diagnostic system approved by the manufacturer for diagnosis.
If the manufacturer approved diagnostic system is not available, use a scan tool to retrieve DTCs and refer to the DTC Index.
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