I'd check the dealer cost of marrying a new cluster to the pcm first. They may want to rape you.
Pull-A-Part wants $32 for a cluster, if someone has damaged one there I'd be inclined to take it apart and see how they designed the lighting, or buy 2 of them and play with one at home.
That means they most likely used led's.
Options:
1. Send cluster out for testing/repair - if it is a problem with the cluster and it can be repaired it avoids the dealer cost of a new cluster and/or marrying it to the pcm.
2. See if Pull-A-Part Memphis has a 2004 Navi on the yard. If the price...
If you have a bright flashlight shine it in one of the sockets to see what will light up. That way we will know if those are used to illuminate the cluster or indicator lights.
Connect the cluster back up but leave one of the bulbs out. There are two contacts on the board for the bulb. One is powered and the other is ground.
Jumper in place, dimmer set to high, meter on dc volts. Red lead to the contacts while the black lead to a good ground. One side should have power...
Starting at "off" it is 9 clicks clockwise - put the leads together and it should tone.
The meter provides power when test for continuity. That is the reason you disconnect power in the circuit and disconnect the plug at the cluster. Plus at higher voltages the meter would explode on you...
Grounds - disconnect the plug from the cluster, meter to continuity setting, one lead to ground wire in the plug the other to the ground point at the other end of the wire.
Lighting would need to use the jumper as before to power the circuit. You probably have a bad splice.
Can't go by looks - can't see breaks inside the insulation.
With the park/headlights on are the radio lights on also and will the dimmer switch work on them?
The illumination circuit runs through the instrument cluster. If everything after the cluster works as it should then the problem is...
Have you checked the grounds? They are usually located behind the driver and passenger kick panels. Since your air bag light is on that means at least one of the grounds is good.
Another thing to check are the bulbs in the cluster - are they there, good etc?
Time to pull the cluster so that you have access to the plugs in the back.
Jumper in place, check for power at:
c220a pin 12
c220a pin 15 ign switch in "run" - see diagram 60-5
I looked at the 2003 Navi diagrams and 17-4 is the same as the 2004. The program lists all the diagrams that have s224 on them but not the location. So that means you have to follow the wire until you find it. Or you could use a jumper wire to put power on pin 2 - connector c2065b with the main...
Diagram 71-4 see splice between main light switch and dimmer switch at bottom of page, looks like s124. There will be a diagram locating each splice by number. Check the splice for power with key in run position.
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