Circuit/System Verification
WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Ignition ON, observe the scan tool dimming control signal parameter while operating the dimmer switch from high to low. The reading should change from a high percent to a low percent as the switch is activated.
- If the reading does not change, refer to Dimmer Switch Malfunction .