After i install my xtreme sound wms336rw and turn it on there is no illumination at all on the face plate. also there is a cluster of wires in the back that contain a "Tiny ( RED, BLACK, LIGHT YELLOW, AND DARK YELLOW, AND WHAT SEEMS TO BE A GROUND WIRE SURROUNDING THEM)" Please Help Me Figure This Out! Thank You, Daven M.

a fuse blew.
this car has an electronic dash cluster. (with brain)
first is fuses. (check them first) (2 of them)
second is scan it. scan the PCM for DTC error !

if rpm dies, for sensors the engine dies...
The PCM runs spark and injection off 2 sensor and RPM
if they die so does spark and injection.
the cluster has self test mode, try that first?
this proves the cluster is ok.
this is covered in the FSM for your JEEP

the WJ jeep
Chapter 8J covers all this.. to great details.
page 8
fuse 17 and 22 must be good. JB box, cab.

posted now 100 of times, here it is again.
quote
The instrument cluster actuator test will put the
instrument cluster into its self-diagnostic mode. In
this mode the instrument cluster can perform a selfdiagnostic
test that will confirm that the instrument
cluster circuitry, the gauges, the PCI data bus message
controlled indicators, and the electro-luminescent
illumination lamp (if equipped) are capable of
operating as designed. During the actuator test the
instrument cluster circuitry will sweep each of the
gauge needles across the gauge faces, illuminate each
of the segments in the Vacuum-Fluorescent Display
(VFD), turn all of the PCI data bus message-controlled
indicators on and off again, and turn the electro-
luminescent illumination lamp (if equipped) on
and off again.
Successful completion of the actuator test will confirm
that the instrument cluster is operational. However,
there may still be a problem with the PCI data
bus, the Powertrain Control Module, the Airbag Control
Module (ACM), the Body Control Module (BCM),
the Controller Anti-lock Brake (CAB), the Sentry Key
Immobilizer Module (SKIM), or the inputs to one of
these electronic control modules. Use a DRBIIIt scan
tool to diagnose these components. Refer to the
appropriate diagnostic information.
If an individual indicator lamp or the electro-luminescent
illumination lamp do not illuminate during
the actuator test, the instrument cluster should be
removed. However, check that the incandescent lamp
bulb is not faulty, that the bulb holder is properly
installed on the instrument cluster electronic circuit
board, or that the electro-luminescent lamp pigtail
wire connector is properly connected to the instrument
cluster electronic circuit board before considering
instrument cluster replacement. If the bulb and
bulb holder, or the electro-luminescent lamp connection
check OK, replace the faulty instrument cluster
unit.
(1) Begin the test with the ignition switch in the
Off position.
(2) Depress the odometer/trip odometer switch button.
(3) While still holding the odometer/trip odometer
switch button depressed, turn the ignition switch to
the On position, but do not start the engine.
(4) Release the odometer/trip odometer switch button.
(5) The instrument cluster will automatically
begin the actuator test sequence, as follows:
(a) The cluster will turn on, then off again each
of the PCI data bus message controlled indicators
(except Airbag) to confirm the functionality of the
indicator and the cluster control circuitry:
(b) The cluster will sweep the needles for each of
the gauges from minimum to maximum and back
to minimum to confirm the functionality of the
gauge and the cluster control circuitry:
(c) Only on models with a premium version of
the cluster, the cluster will illuminate the electroluminescent
lamp and turn it off again to confirm
the functionality of the lamp and the cluster control
circuitry.
(d) The cluster will sequentially step the odometer/
trip odometer VFD display from all zeros
(000000) through all nines (999999) to confirm the
functionality of all VFD segments and their control
circuitry, then display the software version number,
followed by "DONE".
(6) The actuator test is now completed. The instrument
cluster will automatically exit the self-diagnostic
mode and return to normal operation at the
completion of the test, if the ignition switch is turned
to the Off position during the test, or if a vehicle
speed message indicating that the vehicle is moving
is received from the PCM over the PCI data bus during
the test.
(7) Go back to Step 1 to repeat the test, if
required
end quote.


if this passes and fuses are good
then you may have DTC errors scanned
if you scan it and you see comminications error from PCM to cluster, well that be it. ... and am not going into THAT>here.

Let me know if this helps out.

Heater & Air Conditioning

1. Disconnect the negative battery cable.
   
2. Remove the screws securing the cluster trim plate to the instrument panel.
   
3. Tilt the top of the cluster trim plate downward releasing the clips that mount the bottom of the trim plate to the dash. Remove the trim plate.
   
4. Remove the screws attaching the accessory trim center plate to the dash.
   
5. Tilt the top of accessory trim plate downward releasing the clips that mount the bottom of the plate to the instrument panel. Remove the plate.
   
6. Remove the screws attaching the control assembly to the dash.
   
7. Remove the control assembly from the dash.
   
8. Disconnect the control assembly electrical connectors.
   
9. Remove the control assembly.
   

To install:

1. Install the control assembly.
   
2. Connect the control assembly electrical connectors.
   
3. Install the control assembly attaching screws.
   
4. Push the mounting clips into place and roll the top of the accessory trim plate upward into position.
   
5. Install the screws attaching the accessory trim plate to the dash.
   
6. Push the mounting clips into place and roll the top of the cluster trim plate upward into position.
   
7. Install the screws attaching the cluster trim plate to the instrument panel.
   
8. Connect the negative battery cable.
   

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Removal & Installation

1. Disconnect the negative battery cable from the battery.
   
2. Remove the lower steering column cover-to-instrument panel screws and the cover.
   
3. Remove the instrument cluster trim plate-to-instrument cluster screws and the panel, then allow the panel to hang to the left side by the wiring.
   
4. Disconnect the electrical connector from the rear of the headlight switch.
   
5. Disengage and remove the headlight switch from the instrument cluster trim plate.
   

To install:

1. Connect the electrical connector to the rear of the headlight switch.
   
2. Engage and install the headlight switch in the instrument cluster trim plate.
   
3. Install the instrument cluster trim plate-to-instrument cluster screws and the panel.
   
4. Install the lower steering column cover-to-instrument panel screws and the cover.
   
5. Connect the negative battery cable to the battery and check operation.
   

Remove the 5 mounting screws from the instrument cluster trim plate and remove the trim plate. Remove the 4 mounting screws from the instrument panel face plate and remove the face plate.Remove the instrument light grid from the center of the cluster. From behind the instrument cluster reach behind the speedometer and disconnect the speedometer cable by releasing the tab. Pull the cluster forward just enough to detach the "check engine" light bulb from the center of the cluster. Remove the instrument cluster from the dashboard.

Probably too late but I had the same problem yesterday. Try changing your battery. It sounds crazy but it worked for me.

Make sure you have the illumination(orange wire with a white line) hooked up to the solid orange on your cars wire harness

if it has a face plate and most after market radios do then it may not have a good connection check and make sure it does maybe even clean them with alcohol also make sure you got a good ground it may not have enough power to come on all the way (<-- rarely is the case) but it sounds like a bad radio

I would check the ground for the plate lights. You have to remove the steering wheel and dash trim to get to the cluster for removal. Let me know if you need to know how to remove the cluster.

The 12 volts lights that illuminate the face plate are burnt inside and should be replace. It's a common failure on any face plate.

Wire braid out to the faceplate has got a parcially broken wire on it. Sony referes to it as a flexible circuit board. Part can be purchased from sony directly, an on a one to 10 scale to replace about a five.But it does involve taking your radio apart. So if you are handy at electronics. you can look it over. If you have doubts let a professional do it.