Conditions for Setting the DTC

WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.

When the BCM receives an I/P controls illumination lamp request signal and the I/P dimming voltage reference circuit is shorted to ground, open or short to battery positive voltage
When the BCM is not receiving an instrument panel controls illumination lamp request signal and the I/P dimming control circuit is shorted to battery positive voltage or open