Conditions for Setting the DTC
WARNING: This page is about a different car, the 2016 GMC Acadia, 2016 Chevrolet Traverse, and 2016 Buick Enclave. However, it is still accessible from the selected car via links, so may be relevant.
DTC B2645 03
The DTC will set when the BCM detects the ambient light sensor signal voltage is below 0.196 V.
DTC B2645 07
The DTC will set when the BCM detects the ambient light sensor signal voltage is above 4.9 V.