Have a Car Question? Ask a Mechanic Online.
Hi my name is ***** ***** to JustAnswer.
I believe the door latch has two separate circuits for the radio and dome lamps/dash lights. It still may be your issue. I will look up a schematic and get back to you in a moment.
Does the door chime work when the key is in the ignition and the drivers door open?
Okay, is it just the dash lights or do the dome lamps stay on as well?
Oh okay. Let me look something up, one moment.
With the key out of the ignition and the door shut, are you able to operate the windows up and down?
Alright, one moment I have one other schematic to look up.
One last thing, can you dim the dash lights down with the dimmer switch?
Okay, so dimmed all the way and turn the car off it turns itself back up?
Sounds like a failed headlamp switch. Are you comfortable removing the upper trim piece on the dash to unplug it and test?
This is a diagram to show the screw locations for the trim piece. Really we are just unplugging it to make sure the lights on the dash go out, telling us there isn't a short in the wiring somewhere.
Not too complicated. I think only three or four screws
No, it would affect the headlamps as well.
Let me see if I can find something to isolate it.
Okay there is a fuse but you will not have any interior lights. It is in the instrument panel fuse block. Here is a diagram
If that did not turn them off, try the RAP relay or the CHMSL/BKUP fuse in the instrument panel fuse block.
Alright, that changes some things. I did not know you had already pulled that fuse. I think you may have a Body Control Module failure, but I can't be sure. I will opt-out and let another technician help you.
I am contacting you because the post has not been closed or rated.
This question will automatically close in 7 days.
You have not rated which tells me you are not happy or need more help.
Let me help some more. Is there anything else I can help you with?
It was put back out, you are right no one replied that is why I sent you a message. Give me a minute to review your question and see if I can help more.
It is one of the door switches. The computer keeps the radio and lights on until the door is open. If the switch is not working it thinks the door is always closed. I have seen this before.
You need a scan tool to access the BCM, you will be able to see if the doors are open. check the drivers and passenger door switches. I have also seen broken wires in the door bellows boots where the harness for the doors flex when the door is opened.
If you had the tech2 or similar scan tool you could see if the light sensor was the problem as it would set a code in the BCM.
You could also have a short to power in the harness which could be keeping the dash lights on.
Possible, this is tough to diagnose without being there to look at it.
You should start unplugging fuses, one by one, until the dash lights go off. This will narrow down the problem.
Unplug a fuse, then put it back in the same spot, then keep going.
You could have another system backfeeding the lights. It may not be related to illumination.
There are quite a few circuits in the vehicle that are hot at all times.
You could certainly replace the sensor if you feel that is the issue. Keep in mind I cannot be there to see the vehicle and what is happening or test it etc.
Ok sounds like a plan. I am going to sleep now, will be back on tomorrow. Please keep me posted on your progress. Feel free to send me a message anytime, thanks.
You can test the BCM inputs and outputs, and see if it is the problem. It may or may not set a code. It depends on what is happening on the circuit board in the bcm. For your issue you can usually open the bcm up and see corrosion on the green circuit board.