Conditions for Setting the DTC
WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
DTC B1A75 11
The Lighting Control Module detects a short to ground on control circuit 820.
DTC B1A75 12
The Lighting Control Module detects a short to voltage on control circuit 820.
DTC B1A75 13
The Lighting Control Module detects an open/high resistance on control circuit 820.