Conditions for Setting the DTC

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

The LED dimming signal circuit is open.
The LED dimming signal circuit is shorted to ground.
The LED dimming signal circuit is shorted to voltage.
There is a loss of the rear fuse block TBC 5 battery supply voltage to the BCM for more than 1 second.