Question about 1997 Cadillac DeVille

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97 Cadillac Deville, car will not start due to THEFT SYSTEM PROBLEM. Turn the ignition and it does nothing. how can I fix this

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If it is anything like the expedition I own there is a chip in the key that needs to match the ignition for the vehicle to start.

Posted on Sep 20, 2010

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Posted on Jan 02, 2017

seanpwright
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SOURCE: 97 cadillac deville

you either have a bad key...did you try more than one key?
Two other things can be wrong..
1) the igintion cylnder (where ya put the key in) has samll wires that sense the pellet in the keys for your car, and often they break, and the cylnder has to be replaced.
2) the passkey module has gone bad.
Either of these problems can be fixed by any compatent mechanic that has cadillac experience.

Posted on Aug 27, 2009

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Dec 29, 2015 | Cadillac Cars & Trucks

1 Answer

Im having a problem with my 97 cadillac deville..my dash reads theft system problem car may not start...my car starts fine evertime... but when I turn my car off and take out the key the dash still stays...


I suggest to check owners manual disarm theft procedure. If this isnt solve it, will need visit your dealer in order to diagnostic ignition key system, they have proper tool for this.

Mar 27, 2012 | 1997 Cadillac DeVille

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It will not start when I turn the ignition.


97 Cadillac Deville, Car will not start due to THEFT SYSTEM PROBLEMS

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2 Answers

97 cadillac deville


you either have a bad key...did you try more than one key?
Two other things can be wrong..
1) the igintion cylnder (where ya put the key in) has samll wires that sense the pellet in the keys for your car, and often they break, and the cylnder has to be replaced.
2) the passkey module has gone bad.
Either of these problems can be fixed by any compatent mechanic that has cadillac experience.

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97 cadillac deville starting disabled car will not restart.


Like they say, "Cadillacs are easy to break into, but hard to steal!"

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'97 Cadllac Deville Concours reading "Anti Theft System Problem"


I had the same problem. trying to save money i took it to several auto places who thought they could fix it..... after a lot of money and my 800.00 after market alarm was taken off i had it took to the dealer . They fix it in two hours they put in new switch and key haven't had any problems sence.

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Try cleaning the key "chip" resistor and if this doesn't work try the other key.

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I just had this same problem with a '96 . do you have a vats key in your '94? you need to bypass the VATS system. read some of the blogs on this site and it will tell you how to do it. I fixed mine with a $2 resistor from radio shack.

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