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Cadillac Repair/1992 cadillac deville cruise control

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Expert: - 11/18/2011


Question
When I go to use my cruise control on my 1992 cadillac deville it doesnt come on. their is suppose to be a green light that comes on inthe message center. I pulled all the fuses and they look good. How do I check the servo. If you have any other good input let me know. Thanks.

Answer
Hello,

First, look at the owners manual to make sure there isn't a second fuse box. Pulling and looking at fuses is no good because you can have a blown fuse that did not blow in the center. Use a cheap test light.

The cruise is tied into the ECM/PCM which could most likely be the problem. Rather common computer will fail.

I you are keeping the car I would recommend trying to get a factory service manual from Craigs or Ebay. There are diagnostic flow charts that will assist you so you are not guessing on any problem.

There is not much to your cruise. The servo, the control switch and the computer. Nothing like they used to be.

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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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