Switch, Dimmer: Operation

The mode and dimmer switch uses a single resistor multiplexed output to control the many functions and features it provides. The switch receives a clean ground from the Instrument Panel Cluster (IPC). It then provides outputs to the IPC on a panel lamps dimmer signal circuit to control panel dimmer and interior lighting functions.

The dimmer module illumination circuit receives a path to ground at all times through an instrument panel ground circuit. The illumination level is controlled by a Pulse-Width Modulated (PWM) output received from the BCM on a panel lamps driver circuit. The BCM controls this output based upon the panel lamps dimmer signal circuit input from the dimmer module.

The dimmer switch operates as follows:

• Interior Lighting Control  - The up arrow on the mode panel is pressed to bring up the dimming option in the EVIC display. Once this has shown, the up and down arrows on the panel increase or decrease the level of interior lighting.

The dimmer panel and switch as well as the hardwired inputs and outputs of the switch may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information.