Dimmer Switch: Description and Operation
I/P LAMP DIMMERVoltage is supplied to the I/P lamp dimmer and the illumination lamps when the light switch is in the PARK or HEAD position. The solid state dimmer controls the amount of ground provided to the lamps. The solid state dimmer is grounded to G200 through the Left INstrument Panel Junction Block. All of the interior displays are grounded to G200. The intensity of the instrument panel and instrument cluster assembly lamps is controlled by the I/P lamp dimmer located on the left side of the instrument panel. The parking lamps or headlamps must be activated for the instrument panel and instrument cluster assembly lamps to be illuminated. When the parking lamps or headlamps are activated, rotating the I/P lamp dimmer counterclockwise will decrease the instrument cluster assembly, rear window defogger switch, heater control assembly, ashtray and cigar lighter lamps illumination. Illumination of the radio display will revert from 100 percent to the setting of the IP lamp dimmer.
Refer toInstrument Panel (I/P) Dimmer Switch Replacement in Instrument Panel, Gages, and Console for I/P lamp dimmer removal and installation procedures.