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Cadillac Repair/Anti-Theft System on my 1990 Cadillac Brougham

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Expert: - 6/7/2009


Question
I have a 1990 Cadillac Brougham, that i am trying to locate the anti-theft system box, or the relay switch for it...or the power supply for it, doesn't really matter....
I just need to turn it off, can you help me..???

Answer
Hello,

I don't have manuals that old and you won't find them at dealers. The module should be under the dash, however if you disconnect it or disable it, what else are you going to disable? Your headlights, your horn etc.?

The problem that you have is very common in which you have a factory alarm that is giving you problems that is built into many different circuits of the vehicle. Its not like an after market alarm where you can just remove it.

This was planned obselesence on the part of the manufacturer. The only place you could get it fixed was the dealer and that was only for five years.

Try going to Ebay or Craig's list to see if you can get a 1990 factory electrical service manual for your car.

Without the information in the service manual, you are going to have nothing but problems.

Rob

Cadillac Repair

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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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