Question about Cars & Trucks
Car wont start security light staying on
The Security light is a visual indication that something in the car's antitheft system is failing. In most GM cars 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 misinterperates 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 may help you find ways to bypass this or fix it yourself.
Posted on Apr 26, 2013
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Posted on Jan 02, 2017
OK, i had this problem with my 99 maxima 6 month ago and i made new key at the dealer (150 $) , and the problem was gone for few months, but 2 months a go the same problem is back and i dont know what to do (the car stars after i try few times) and it drives with the security light on ????
Posted on Feb 05, 2010
SOURCE: my security light is on
leave the key in the ignition, turned to 'run' (just before the crank position) and leave it there for about 15 minutes-the security light will then stop flashing-do NOT turn it off, turn it to crank and start the car. You have a security module that is not seeing the same resistance in the ignition switch as it expects, meaning you will have to either replace the ignition switch (expensive) or bypass the module (easy and inexpensive)-I have done lots of these, requires about 15 cents worth of parts and can be done in 1/2 hour.
Posted on Jan 24, 2011
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