Circuit/System Verification
WARNING: This page is about a different car, the 2010 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, observe the scan tool Dimming Pot A/D parameter while operating the dimmer switch from high to low brightness. The parameter should change from a high count to a low count as the switch is activated.
- If the parameter does not change, refer to Dimmer Switch Malfunction.
- If the parameter does change, refer to Interior Backlighting Malfunction.