Test Notes

NORMAL OPERATION
Under normal circumstances. the air bag diagnostic monitor expects no circuit on Pin C277-17 of the air bag diagnostic monitor. This feature was replaced with New Generation Star (NGS) Tester 007-00500 or equivalent and the memory clear connector should have been removed from the system. However, some vehicles have maintained the memory clear connector for redundancy. The memory clear circuit was used to clear the diagnostic module's Non-Volatile Random Access Memory (NVRAM) contents and retrieve stored fault codes by temporarily shorting Pin C277-17 to ground. If Pin C277-17 is improperly shorted to ground, the air bag diagnostic monitor will store in memory a DTC B1923 and flash out on the AIR BAG indicator lamp fault code 23.

Should the short on Pin C277-17 to ground be repaired or intermittent, the air bag diagnostic monitor will store a DTC B1923 in memory.

POSSIBLE CAUSES
Improper grounding of the memory clear circuit can be caused by a short to ground on Circuit 631 (T/R) which can cause improper memory clear grounding.