Wrangler L6-4.0L VIN S (2000)
Instrument Panel Bulb: Description and 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, counter-clockwise to brighten). The instrument
cluster illumination lamps receive battery feed from the panel dimmer rheostat in the headlamp switch through a fuse in the fuseblock module.
The instrument cluster electronic circuitry also monitors the cluster illumination lamp dimming level whenever the park or head lamps are turned
on. The instrument cluster electronic circuitry responds by adjusting the dimming level of the odometer Vacuum Fluorescent Display (VFD).
When the park lamps or headlamps are turned off, the VFD is illuminated at full brightness for improved daylight visibility.
Each of the cluster illumination lamps is located on the instrument cluster circuit board. Each cluster illumination lamp has a replaceable bulb and
bulb holder.