Circuit/System Verification
WARNING: This page is about a different car, the 2009 Saturn Vue. 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 parameter should change from a high percent to a low percent as the switch is activated.
- If the parameter does not change, refer to I/P Dimmer Switch Malfunction.
- If the parameter changes, refer to Interior Backlighting Malfunction.