GM Service Manual Online
For 1990-2009 cars only

You may NOT clear a DTC from the memory of the BCM by performing either of the following actions:

    • Disconnecting the battery
    • Disconnecting the BCM electrical connectors

Perform one of the following steps in order to clear a DTC from the memory of the BCM:

    • Use the scan tool.
    • Perform 100 concurrent ignition cycles without the fault recurring.

You must clear the DTCs from the BCM after performing a repair. You may also clear the DTCs from the BCM in order to ensure that a malfunction will not occur again. If the fault still exists, the DTC will reset after clearing the DTCs. If any current non-Passlock system related DTCs exist, diagnose those DTCs before clearing the Passlock DTCs. When the Passlock DTCs are cleared, the BCM DTCs will also be cleared.