I have provided the operation of the lighting system. Assuming the dimmer switch is okay, and I say that because this should also control the other dash items. I would first check the bulbs in the cluster to see if they are burnt out. I have provided that.
Cluster Illumination Lamp
When the park or head lamps are on, the cluster illumination lamps light. Illumination brightness is adjusted by sliding the panel dimmer switch knob (downwards to dim, upwards to brighten). Each of the instrument cluster illumination lamps receives pulse-width modulated battery feed from the Body Control Module (BCM) on the hard-wired panel lamps driver circuit. The BCM monitors the panel dimmer resistor switch to determine the desired dimming level, then adjusts the pulse-width signal accordingly
The BCM also sends the proper panel lamps dimming level message on the Chrysler Collision Detection (CCD) data bus to control the dimming levels of the various vacuum fluorescent displays. All modules on the CCD data bus with vacuum fluorescent displays (instrument cluster, radio, mini trip computer, vehicle information center) receive this message and adjust their dimming levels to match that of the incandescent cluster illumination bulbs driven directly by the BCM.
Vehicles equipped with the automatic headlamps option have an automatic funeral mode or parade mode. In this mode, the BCM uses an input from the automatic headlamp light sensor to determine the ambient light levels. If the BCM decides that the exterior lighting is turned on in the daylight, it overrides the selected panel dimmer switch signal by sending a message on the CCD bus to illuminate all vacuum fluorescent displays at full brightness for easier visibility in daytime light levels. The automatic funeral mode or parade mode has no effect on the incandescent bulb dimming levels.
Each of the cluster illumination lamps is located on the instrument cluster circuit board. Each lamp has a replaceable bulb and bulb holder.
WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIRBAG SYSTEMS BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY .
Remove the instrument cluster from the instrument panel. See Instrument Cluster for the procedures.
Remove the bulb and bulb holder from the circuit board on the rear of the cluster housing by turning the holder counterclockwise. CAUTION: Always use the correct bulb size and type for replacement. An incorrect bulb size or type may overheat and cause damage to the instrument cluster printed circuit and/or the gauges.
Reverse the removal procedures to install.
Thursday, October 23rd, 2008 AT 3:02 PM