Conditions for Setting the DTC

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 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.