All airbag related repairs should be carried out by a qualified technician
During vehicle operation, the Restraints Control Module (RCM) detects and stores both intermittent and hard failure codes in non-volatile memory. The RCM will also display a Light Fault Code (LFC) on the AIR BAG warning light. The DTCs can be retrieved with a scan tool using the retrieve/clear continuous codes option. If no DTCs are present, scan tool will display SYSTEM PASSED message. Once a fault code is logged in RCM memory, it will stay in memory until 256 ignition cycles have been recorded or until scan tool is used to erase the DTCs.
The on-demand self-test can be used to verify there are no electrical faults within air bag system. During this test RCM will check each electrical component in system. If fault is detected, DTC is displayed on scan tool with brief description of fault. Faults detected during self test are not stored in memory, unless same fault was detected during normal vehicle operation. Self test should be run after service to verify operation.
RCM checks left-side air bag module circuit for shorts to battery or ignition by monitoring voltage at RCM harness connector C233, terminals No. 2 (White/Light Blue wire) and No. 3 (Brown/Light Blue wire). If RCM detects battery or ignition voltage, it will store DTC B1992 in memory and flash Code 36 on AIR BAG warning light.
A left-side air bag circuit short to battery or ignition voltage could be caused by a short to battery or ignition voltage on White/Light Blue wire (circuit 1257), a short to battery or ignition voltage on Brown/Light Blue wire (circuit 1258) or a short to battery or ignition voltage in left-side air bag module.
Wednesday, February 18th, 2009 AT 10:35 AM