Question about Cadillac DeVille

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Where is the antitheft security brain or computer on a 1991 deville my car is in shop right now askn me for a 600 dollar deposit to change this part and not guarenteing its gona start can i change it my self if i go to pick and pull and get one

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First of all never spend a dime with any shop that will not guaranty there work.If they are guessing with your money then they have issues.I believe the security system is built into the pcm,but I am a drivetrain guy.I think you need to find another shop so you dont flush 600 down the ****.Let me know where you are located and I will help you find someone honest and qualified through some of the trade groups I belong to.

Posted on Mar 26, 2011

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1999 Cadillac deville won't start


The security, antitheft or lock picture/icon is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

May 21, 2014 | 1999 Cadillac DeVille

1 Answer

Change computer in a 1997 deville now the theft system kicks in what should i do to reset it


The security, antitheft or lock picture/icon is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. This link explains it pretty well.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Dec 06, 2013 | 1999 Cadillac Eldorado

1 Answer

91 cadillac devile won't start. dash, radio & powers work


These early 90's vehicles had alot of problems with the antitheft systems. When they fail, they actually cut power to the starter or injectors. Look for a light on the dash that says SECURITY or ANTITHEFT. You see this light, go to this link for answers.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Mar 14, 2013 | 1991 Cadillac DeVille

1 Answer

Mycadillac wont crank


These cars are equipped with an antitheft system that disables the starter if not working correctly or attempted theft. Turn your key forward 2 clicks until right before it would normally start, if you see a light in the dash that says SECURITY or ANTITHEFT, go to this link for help.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Apr 17, 2012 | 1995 Cadillac DeVille

1 Answer

I have a 91 cadillac deville security light keeps coming on and wont turn over i gave a little and went back and tried again and keeps making the clicking sound..what could this be?


The security light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM. (Theft Deterrent Module) The TDM is what tells your computer that the correct key is being used and that it is "OK" to allow the vehicle to start and run. These 3 parts must be in CONSTANT communication. If the key is in the ignition, then these parts are sending important signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, (normally due to a failing/broken part) the car goes into antitheft mode. The car misinterperates this and thinks its being stolen or hotwired because it is NOT getting that signal from YOUR specific key. There is where the security light turns on and shuts down your vehicle. So basically, if that light is on, your system has some sort of failing part. This can start as an intermittent "no start", to your vehicle not running for days at a time, to the vehicle NEVER starting again. The problem is electrical and computer based, so don't count on an easy reset button, or the problem fixing itself. The hard part is isolating which part is the problem. You can spend a thousand dollars through a mechanic very easily. I have had great luck with bypassing the entire system. This way the problem will never return. It actually CAN'T ever return because it is eliminated. This can also be done yourself at a much cheaper cost. Read through this link very carefully. You'll find alot of information and pictures, along with ways to help you fix this.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Feb 18, 2012 | 1991 Cadillac DeVille

1 Answer

91 cadi deville were would i find the kill switch?My car wont start it makes a nocking noise.


There probably isnt a kill switch, but these cars did tend to have antitheft problems that would/will disable your starter. Here is a link on that

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Feb 14, 2012 | 1991 Cadillac DeVille

1 Answer

1988 Cadillac DeVille


The 88 Deville is one of many cars made by GM that is using the antitheft system called VATS PASSKEY. (its that little black chip in the key) When this system fails, the car can't get the signal from the chip, so it locks out the starter to prevent theft. The car thinks it's being hot wired, so it shuts down. Look for a light on the dash that says SECURITY or ANTITHEFT. This is proof of a security failure. This might be your problem. This link explains more.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Dec 31, 2011 | Cars & Trucks

1 Answer

Cadillac cevil 1991, security light is on, the car dont start it was working fine we just changed the exaus pipe and then the only thing thats happening when we turn the ignition key is the abs light that...


This is a very common problem on GM vehicles. Your car runs an antitheft system called VATS Passkey. It all starts from that little black chip in the key shaft. When this system starts to fail, the car goes into antitheft mode and shuts off the starter and/or injectors depending on the car and system. There are alot of parts involved in this system and can be tricky to diagnose the problem. (expensive too) Ive had great luck in just bypassing the whole system. Its a one time, permanent fix that will never break again. Go see this web page, it has alot of info and ways too fix this problem yourself..

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Sep 14, 2011 | 1991 Cadillac DeVille

4 Answers

I have a 91 Cadillac Deville that will not start. It does not crank or even try to start. A while ago, I ran the battery down, and then was able to jump it and it ran fine. Then, I left the lights on...


Try turning the key to the on position and wait for the security light to stop flashing (usually ten or fifteen minutes) then turn the key off and try to start it. On some you need to do that procedure three times without starting but most will re-start after doing it once. Usually this will work to re-set security on GM vehicles.

Sep 21, 2009 | 1991 Cadillac DeVille

1 Answer

WHY DOES SERVICE RIDE SELECT LIGHT ON IN MY 1994 CADILLAC DE VILLE


one of the stuts / shocks have gone bad and need to be replaced. I am getting this done as I type this.

Electronic stuts are 600-1500 dollars and passive stuts are 300-600 dollars. Also if using passive struts / shock you need a relay/connector to bypass the computer command ride control. The can be made for a few dollars or bought on the net for $85.

Sep 08, 2008 | 1994 Cadillac DeVille

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