GM Service Manual Online
For 1990-2009 cars only

Important: Only a current DTC B3031 will be cleared from the BCM without a wake up cycle when the BCM determines the test condition and failure condition for this DTC are false.

The ignition switch should be in the OFF position when connecting or disconnecting the connectors to the BCM. Always disconnect the brown BCM connector FIRST and connect the brown BCM connector LAST. The BCM may set DTC(s) with the ignition switch in the OFF position. Disconnecting the battery or disconnecting the BCM connectors will NOT clear DTC(s). Disconnecting the BCM connectors may cause other DTC(s) to set due to a loss of power or ground to the BCM while the BCM is in the AWAKE mode.

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.