Test Notes

NORMAL OPERATION
Diagnostic Trouble Code 63 refer to Diagnostic Trouble Code 23 The air bag diagnostic monitor records air bag system diagnostic trouble codes in its non-volatile memory (NVM). Upon servicing and correction of the faults, the diagnostic trouble codes may be cleared from the air bag diagnostic monitor's NVM. Under normal circumstances, the air bag diagnostic monitor expects an open circuit on Pin 17 of the air bag diagnostic monitor.

During Diagnostic Trouble Code Clearing, the circuit on Pin 17 will be temporarily shorted to ground. If this clearing procedure is performed improperly, or if Pin 17 is improperly shorted to ground in another fashion, the air bag diagnostic monitor will store in memory and flash out on the air bag indicator a DTC 23.

Should the short on Pin 17 to ground be repaired or intermittent, the air bag diagnostic monitor will flash out a DTC 63 (or a higher priority DTC if one exists) on the next ignition switch cycle.

POSSIBLE CAUSES

Improper grounding of the Memory Clear circuit can be caused by:

- A short to ground on Circuit 631 (T/R) can cause improper Memory Clear grounding.

- Improper Diagnostic Trouble Code Clearing procedure performance can cause