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Cadillac Repair/Help disable factory security 1989 Cadillac deVille

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Expert: - 7/2/2009


Question
I’m installing a Ultra Start u-1272tL remote starter in my 1989 Cadillac Coupe deVille 2-door with front wheel drive.  I have a factory security system that is prior to passlock or VATS systems.  It has only a dash security light that will beep the horn for about a minute about every ½ hour if the doorlocks are tampered with and under some other conditions that I’m not completely familiar with.  It may also disable the starter but I’ve not experienced that yet.  I understand that it’s possible to disable this system and that it does not require a bypass module to do so.  Can you help advise the procedure to implement during the remote starter install?

Also do the trunk and horn operations require a relay of some type to protect the remote starter current draw?  

Answer
Hello,

Bad news, your car is too old to have VATS on Cadillac. Did not start until 1990.

You may have a factory installed alarm, but the car does not have a factory starter disable. The problem is that the car is too old for me and most to have any wiring diagrams for your car.

Your questions may be answered if you can find a factory electrical manual for your 1989 Caddy. You can try Ebay or Craig's list.


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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