Question about 1998 Chevrolet Cavalier

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Antitheft light on will not start

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  • yadayada
    yadayada May 11, 2010

    Try this, it might work.



    PASS LOCK RESET GM CARS

    1) Put the key in the ignition and turn to the "ON" position. Leave it that way for 10 minutes. After 10 minutes turn the key and take it out. Repeat this process (2) more times (3 times, 30 minutes total) This should reset the passlock system to recognize your key

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In order for a theft deterrent vehicle to run, a password is communicated between the Instrument Panel Cluster (IPC) and the PCM. If a PCM is replaced, the new PCM needs to learn the correct password of the vehicle. When the new PCM is installed, the EEPROM calibration is flashed into the new PCM and the vehicle will learn the new password upon initial ignition ON. If the PC is replaced, the PCM needs to learn the new password from the IPC. The password learn procedure is as follows:

  1. Attempt to start vehicle, then leave the ignition ON. The THEFT SYSTEM telltale will flash for 10 minutes.
  2. When the THEFT SYSTEM telltale stops flashing, start the vehicle. Once the vehicle is running, the password is learned.

Posted on Jan 09, 2009

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Hummer H3 Antitheft. How do I reset it


This may be related to the antitheft system The system is known for turning off the starter and/or injectors when it fails. Is there a light on the dash that says SECURITY? This is a common problem worth looking into. http://www.diy-gm-security.com/

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The security, antitheft, or passlock 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 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.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Mar 01, 2013 | Cars & Trucks

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How to reset antitheft


The security, antitheft, or passlock 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 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.
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When replacing the steering, I bet you interrupted the antitheft system. I'm sure when you turn the key forward you'll see a light on the dash that says SECURITY or ANTITHEFT. If you see this light, this link will show you how to get around it.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

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2000 Chevy Impala just had a used engine installed. Battery is brand new, but the car will not even turn over when you try and start the car. THe radio lights and all the electrical components work fine....


These cars and many many many other gm cars and trucks are equipped which an antitheft feature. Many times on engines swaps and ignition changes, this system gets interrupted because the computer is not seeing the proper signal from the original equipment. Try to start the car, when it doesn't turn over, leave the key in the "on" position. Look for a light near your gauges that says "security" or "antitheft". If you see this indicator light, then the problem is definitely the antitheft system. Fixing it is rather expensive. Bypassing it is relatively cheap. This link explains everything you need to know.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

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1 Answer

My GMC sierra starts and dies in 1 second but after maybe 10 minutes it starts up fine in a few days or a week it will do this again


GM's are known for possessing faulty antitheft systems. When these systems being to fail, the antitheft misinterprets the failure as an attempt to steal the vehicle. The system then shuts off the injectors. The system resets after 10 minutes exactly. As the fault gets worse, this will happen more often. Next time this happens, note any lights that illuminate on the dash area. If you see one that says SECURITY or ANTITHEFT, this is most likely the problem. This link will help you.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Feb 16, 2012 | 1999 GMC Sierra

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My 2003 chevy cavaliel will start but the dies after a few secons what could cause this


I do know that when your antitheft system fails, you will get exactly what you have. Turn key, starts for 1-5 seconds, then stalls. This will be followed by a light illuminating on your dash that says SECURITY or ANTITHEFT. If you see this light, go to this link for help.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Feb 04, 2012 | Cars & Trucks

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I have 1993 grand prix 3.1 all lights are on i turn the key to start the car starter dont turn over but the lights dont go out


Possible antitheft problem. When the antitheft fails, you get a light on the dash that says SECURITY, and the starter gets turned off. This link explains.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Feb 01, 2012 | Cars & Trucks

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Why car will not start


This is due to the antitheft system kicking in. The security light indicates some sort of failure in antitheft system. The car is looking for a certain signal from your key, but it is not getting it. So when you try to start the car, it assumes it is being tampered with and shuts down. Go to this link, you will learn how the system works, and ways to save some money fixing this yourself.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Jan 28, 2012 | 2004 Oldsmobile Alero

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These cars had big problems with failing antitheft systems. Next time it doesnt start, leave the key forward and look for a light on the dash that says ANTITHEFT, SECURITY, or has a picture of a car with a padlock thru it. If you see any of these lights, go to this link to get some info on the problem

http://vatspasslockpasskeysecurityhelp.yolasite.com/

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