Question about 1998 Cadillac DeVille

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Auto theft system

I have 1998 cadillac seville sts. The service auto theft light came on. Now when car is on, electric windows, radio, gas gage and ac will not work.but will work when car is off (acc). Can someone help me. HOw to servie auto theft system or were to find it in my car

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Never seen a deville so cant help,but it sounds like a relay is not being controled by the ECU and to locate this fault need special software and again to reset vehicle .sorry i couldnt tell you more know the fault but without dealer software ??i could only rewire to make it work

Posted on Dec 16, 2008

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