Question about 1997 Pontiac Grand Am
The antitheft 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.
Posted on Nov 22, 2013
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Posted on Jan 02, 2017
Turn key to on but with the engine off, push down on the break hold it there squeeze the button on the gear shift then try to turn the key at the same time keep squeezing the gearshift stepping on the brake and turning the key to the right until the car comes on
Posted on May 17, 2013
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