Diagnostic Instructions - Air Bag Supplemental Restraint System (SRS): Notes

Worldwide Diagnostic System (WDS) Vehicle Communication Module (VCM) with appropriate adapters, or equivalent diagnostic tool

The symptom chart can be used to help locate the air bag supplemental restraint system (SRS) concerns if no diagnostic trouble codes (DTCs) are retrieved and the listed symptoms are observed. Whether or not the listed symptoms are observed, always carry out the following:

1. Retrieve all DTCs stored in the restraints control module (RCM) memory. Refer to RETRIEVE/CLEAR CONTINUOUS DTCS  in this article.
2. Run the On-Demand Self Test to determine what DTCs are currently being sensed by the RCM. Refer to ON-DEMAND SELF TEST  in this article.
3. If the stored DTCs are different than the current DTCs, always repair the current DTCs first.
4. If memory displays different continuous DTCs than the On-Demand Self Test, carry out in the following order:
   • On-Demand Self Test
   • Memory (Retrieve/Clear Continuous DTCs)

A DTC can indicate several concerns. DTCs are to assist in system diagnosis and are not to be considered definitive. Always refer to the PINPOINT TEST  corresponding to the DTC to determine where the concern lies and to repair the concern correctly.

The SRS diagnostics can be divided into 3 sections:

• Diagnostic test modes
• PID/data monitor and record
• Active command modes