Conditions for Setting the DTC

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The fault code sets when the BCM commanded state does not match the feedback. When the courtesy lamps supply voltage circuit is commanded high and a short to ground is present.
The fault code also sets when the battery positive voltage circuit of the BCM that is fed by the INADV Power Bus fuse is open or shorted to ground.
The condition above must be present for more than 0.1 seconds.