Instrument Panel Bulb: Description and Operation

SYSTEM OPERATION
Cluster Illumination Lamp
The cluster illumination lamps are hard-wired in the instrument cluster. When the park or head lamps are turned on, the cluster illumination lamps light. Illumination brightness is adjusted by rotating the headlamp switch knob (clockwise to dim, counterclockwise to brighten). The instrument cluster illumination lamps receive battery feed from the panel dimmer rheostat in the headlamp switch through a fuse in the junction block.

The instrument cluster circuitry monitors the cluster illumination lamp dimming level and responds by sending dimming level messages over the Chrysler Collision Detection (CCD) data bus network. These dimming level messages are then used by the overhead console display module to coordinate the dimming level of its Vacuum Fluorescent Display (VFD) with that of the instrument cluster.

Each of the cluster illumination lamps is located on the instrument cluster circuit board. Each lamp has a replaceable bulb and bulb holder. Refer to Lamps for more information.