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Theft light blinks - Cadillac Cars & Trucks

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  • Mista Witt
    Mista Witt Nov 18, 2013

    2004 cadillax srx...anti theft light blinks and truck won't start....

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  • Cadillac Master
  • 2,194 Answers

The theft 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/

Posted on Nov 22, 2013

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1 Answer

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If the theft light isn't blinking then it likely isn't the problem. Does it start and die or just crank and won't fire?

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