Dimmer Switch: Service and Repair

The steering column switches system consists of the following components:
- ignition switch
- multifunction switch
- steering column lock actuator (manual transmission only)
The ignition switch is mounted in the instrument panel to the RH side of the steering column and is activated by rotating the ignition key in the ignition switch lock cylinder.
The integrated multifunction switch is mounted to the steering column and controls the turn signals, hazard flasher, windshield wiper/washer control, and headlamp dimmer/flash-to-pass.
The steering column lock actuator will unlock when a valid ignition key is inserted into the ignition switch lock cylinder. The steering column lock actuator will only lock when the ignition key is removed, and both the vehicle messages for vehicle speed and engine rpm are not present on the Standard Corporate Protocol (SCP) link. Power must not be enabled to the steering column lock actuator while the engine is running. While the steering column lock actuator is in the locked position, the vehicle will be inhibited from cranking.
The steering column lock actuator receives power from the REM, ground from the FEM, and exchanges security-related communication messages with the Instrument Cluster (IC) module over the SCP link.