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Cadillac Repair/Interior lights

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Expert: - 5/28/2010


Question
My interior rear door lights of my 1991 deville, stay on when you close all the doors and everything is off. The lights never never shut off. Also the door locks aren't working. You have to manually open and lock them. Two days after this started happening, the turn signals stopped working but the four way flasher work fine. All the fuses inside under steering column
And maxi fuses in engine compartment are all good. What might the problem be, or what else can I do to find the problem?

Answer
Hello,

You have something going on here that cannot be diagnosed without physically being at the car.

I can take a wild stab at it and that is the best I could do.

You could possibly have a bad body control module (BCM). The bcm is usually located under the dash on the passenger side. For all these problems to occur together, I would think this is a good guess.

Good luck!

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Rob Painter

Expertise

Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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