Cadillac Repair/2000 Seville

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Question
the drivers door control panel has a mind of its own.The mirror control, door locks, windows you never know what is going to happen next when to try to operate them. Also the head lights turned off once and back on. any areas to look at or what should I do?

Answer
Hello,

I am going to address a very common GM problem that takes years in the making. This may or may not be your issue, but would be consistent with your complaint.
The power wiring for the drivers door controls comes through the kick panel area inside the vehicle. The harnesses go through a rubber boot that can be seen when the door is open and from looking at the front edge of the door below the top hinge.
Over time, the plastic insulation gets brittle, eventually cracks from the opening and closing of the door and wires will break. This causes intermittent operation for the door controls, depending of the broken wires are connected or not when you close the door.
I would suggest that you take a flat blade screwdriver to the door portion of the boot and pray from door. Try to push boot towards kick panel as far as you can to see if you spot any broken wires.
In the event you do find broken wires, you need to remove the door trim panel, disconnect all wiring and mounting for the wiring.
Pull the harness out of the door and slide boot off.
Repair the broken wires, reinstall boot, connect wiring and attach it. Put door panel back on.
Normally, I would tell you to disconnect battery, but I believe this has a transponder PK III ignition. Disconnecting the battery may cause memory for key to be erased and car won't start with programming a new ignition key.

Chances are .pretty good that the wiring has some breaks leading to the door controls.

As for your headlights, one time is not going to be enough to do a competent disgnoses. You will need the problem to occur on a regular basis to determine if you even corrected the problem.

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Rob Painter

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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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