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2004 Cadillac DeVille Base 4dr Sedan

2004 Cadillac DeVille
Trim Info:
Front Wheel Drive, 4 Door Sedan, Full Size
18 mpg city / 26 mpg hwy
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March 24, 2014, 11:15 am

Steve L

Question: Whats wrong with this?

I have a 04 Deville. Yesterday as I was about to leave for the morning, I had placed my car into reverse without thinking, and backed into a plywood wall separating my garage from the other one.. No damage to the car, no damage to the separating wall.. I noticed as I returned home yesterday that my reverse lights were not working,upon inspection I found out my license plate lights were coming on instead when the car was in reverse.. Today as I headed out to run some errands I went to pop the trunk to place some things in there, and you could hear the solenoid clicking but it wouldn't release, after several attempts it finally popped the trunk.. ( Keep in mind that the trunk of the car never hit the plywood separating wall.. ) and now the inner bottoms of the tail lights have a section that will not light up, sort of like a 1x1 square cut out.. Am I suffering from a wiring issue, did I maybe pinch a wire under the rear bumper when I bumped the wall? Could t be a solenoid on the transmission that has gone bad? Maybe the trunk solenoid is going bad? It wasn't a hard enough bump to hurt or even leave a mark on the car or the brace on the wall I bumped, and it still does not explain why the license plate lights come on in reverse rather than my back up lamps.. If anyone has some Ideas, I would greatly appreciate it as I have an extended warranty on my car and can use it to have said issues fixed..

March 25, 2014, 10:00 pm

Richard W
Expert Mechanic

With the rear getting hit I don't think the extended warranty will fix it. You have a pinched wire or some thing like that.

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March 26, 2014, 12:32 am

Steve L

Where would the punched wire be? I mean, surely Gm didn't run wires under the rear bumper cover.. The bump was so light youcould barely feel it..

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March 26, 2014, 8:24 pm

Richard W
Expert Mechanic

It has to be some where in the back. You will have to check each wire. Not sure where.

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March 29, 2014, 8:27 pm

Steve L

Just noticed that now the heated seats are no longer working, the auto dim mirror is no longer working, and tonight on my way home from work that a message " service electrical system " popped up.. Voltage is at 15.1 idle, and running it drops to 14.6... so I do not believe it to be an alternator issue. Could it possibly be the BCM going bad slowly killing one component one at a time?

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March 29, 2014, 10:11 pm

Richard W
Expert Mechanic

No it can't be the BCM taking out on component at a time. You have a electrical problem with a wire. You need to have a shop look at it. There will be codes in the computers. You need to get them and go from there. Make sure you check all the codes in all the computers.

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