Disconnect the Anti Theft?

Asked by Sep 18, 2016 at 10:46 AM about the 2003 Chevrolet Malibu Base

Question type: Maintenance & Repair

I bought my 2003 Chevy Malibu in Oct. 2012 used. The anti-theft light was
on all the time and the dealer said to not worry about it.Then in June of
this year my car wouldn't start. I paid to have it towed, and the shop said
all they had to do was reset the Anti Theft and it started. They gave me the
instructions on how to reset the Anti Theft, which I'm thankful for, as since
June of this year I'v had to reset it 4 times which 3 of those times were this
month alone......would like help with this situation.

2 Answers

16,175

Lesson learned - NEVER trust what a used car dealer says. I couldn't tell you what the problem with your anti-theft is, may be a bad passlock sensor in the ignition, or a bad module, non-existent master key, etc., but you'll always have trouble with it with stop-gap bypassing measures. Unfortunately it can cost hundreds to properly fix the passlock system, whether that's worth it to you I can't say.

4,525

That light 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, or not seen at all. When the communication breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. (like it thinks it's being hot wired) The car shuts down because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. It will either turn off the starter, or the fuel injectors. The vehicle may run for 2-3 seconds before shutting down. This link explains it pretty well. http://www.diy-gm-security.com/ http://newrockies.com/

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