Theft system light comes on and the car wont start
The theft 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, 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 hot wired 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/
SOURCE: 2001 ford taurus wont start and anti-theft light is blinking
Either you may be using a key that you had copied from the original or your chip went bad in your original key. Most of cars now a days have the key censor in the key so if it is the incorrect key it will not start your car or if it does not read that chip it will not start
SOURCE: dont know how to reset or bypass gm theft system car is not starting .It tries and quits.
this is one way to reset it :
first make sure the battery is fully charged , then do the following:
key in the ignition but do not crank the motor, just leave it at the
ignition mode for ten minutes ,then turn it off POSITION for 5 seconds then REPEAT again 2 more times. at the 3 rd time youre gonna notice the ANTI THEFT light on dash to blink. when doing the last step , remove key , inserted again and turn on motor , good luck , AJ
SOURCE: buick does not start when theft system comes on
I had the same problem with ours...
It ia a faulty ign switch lock (the sensor) > Expensive part >
Temp fix;
remove the cover underneath the steering column and locate the thin white flat (3) wire (runs from the ignition key lock down to a connector.
After starting the the car , dis-connect the connector under the dash that the Ign lock goes to , after that the car should start everytime.
You will need to replace the lock assy. if you want to fix this correctly ; I have been using ours for (6) months > no problem except the "Theft System " light stays on -
SOURCE: 99 chevy cavalier theft system light on steady, car wont crank.
My 2000 cavalier has done this for 6 months. You take your key out then open your door, wait ten minutes and the system resets itself and the car will start-annoying you bet!!!
SOURCE: theft system light comes on
the ignition cylinders on these cars get worn out over the years and the antitheft module, which is designed to measure resistance values in the cylinder when the key is turned gets readings that are out of spec, resulting in a false resistance reading. There are two solutions: replace the ignition cylinder, which is somewhat expensive, or drop down the glovebox to access the theft module and put a 2000 ohm resistor in line with a wire that goes to the modules' input feed. The resistor costs 15 cents at Radio Shack and it is not that hard to do-it disables the factory alarm, but you will not have that issue again. I have done this fox on a number of late 90's-early 2000's cars, and it always works.
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