Conditions for Setting the DTC

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The BCM detects a short to ground or a short to battery positive voltage in the signal circuit of the DRL ambient light sensor.
The BCM detects a short to ground in the low reference circuit of the DRL ambient light sensor.
The condition must be present for more than 1.0 second.