Steering Column Switches

Steering Column Switches

The steering column switches consist of the following:

- Multifunction switch
- Ignition switch

The steering column switches receive driver inputs and send signals to various components. The multifunction switch controls the windshield wipers, hazard flasher, turn signal, headlamp low/high beam and headlamp dimmer/flash-to-pass. The ignition switch is used in conjunction with the lock cylinder key to start the vehicle. When the lock cylinder key is switched to different positions, it moves linkages which enable the ignition switch to send battery voltage to various components.


Circuit Deactivation Ignition Module (CDIM)

Vehicles equipped with a 6.4L diesel engine may also be equipped with a Circuit Deactivation Ignition Module (CDIM), which is part of the engine idle shutdown system. The role of the CDIM is to disconnect the ignition switch circuits once the engine has shut down in order to prevent possible battery drain. The engine idle shutdown system is controlled by the PCM, refer to Computers and Control Systems Information for information on the engine idle shutdown system.