Question about 2002 Saturn L-Series

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How to reset security after changing battery

When I changed the battery on my 2002 Saturn L300, the car went into Security lock-down. How do I reset it?

Unfortunately I don't have the key fob.

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  • monet_415 Jul 06, 2010

    Thank you for responding!

    The engine turns over but won't start. The car cannot be taken out of Park. Lights are not blinking, horn is not honking. I'm not sure about the security light.

    AAA came and dragged the car out of the garage (couldn't get it out of park!) and took it to Saturn. They said my BCM (body control monitor) was bad. About $600 for parts and labor. I had it towed to another (trusted) mechanic for a second opinion. Waiting to hear.

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The security system shouldn't keep you from getting it out of park. Check to see if the security light is flashing. I can tell you how to reset the security system.

Posted on Jul 07, 2010

  • lmugirl195
    lmugirl195 Feb 04, 2014

    CAn u help me please???

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The security 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) The TDM is what tells your computer that the correct key is being used and that it is "OK" to allow the vehicle to start and run. These 3 parts must be in CONSTANT communication. If the key is in the ignition, then these parts are sending important signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, (normally due to a failing/broken part) the car goes into antitheft mode. The car misinterperates this and thinks its being stolen or hotwired because it is NOT getting that signal from YOUR specific key. There is where the security light turns on and shuts down your vehicle. So basically, if that light is on, your system has some sort of failing part. This can start as an intermittent "no start", to your vehicle not running for days at a time, to the vehicle NEVER starting again. The problem is electrical and computer based, so don't count on an easy reset button, or the problem fixing itself. The hard part is isolating which part is the problem. You can spend a thousand dollars through a mechanic very easily. I have had great luck with bypassing the entire system. This way the problem will never return. It actually CAN'T ever return because it is eliminated. This can also be done yourself at a much cheaper cost. Read through this link very carefully. You'll find alot of information and pictures, along with ways to help you fix this.



http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Jun 18, 2012

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MY SECURITY LIGHT FLASHES AND IT WILL NOT LET ME PUT THE CAR INTO GEAR BUT IT DO START ON A 2002 SATURN L100 ALSO MY KEYLESS REMOTE BROKE

Posted on Jun 20, 2011

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2002 Saturn ls300 security light flashes but will start. Did not get the original key and no control, I have an extra key that was made from a locksmith

Posted on Apr 26, 2013

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Posted on Jan 02, 2017

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1 Answer

Resetting security system on 2002 Saturn


Did you replace any parts?? Lock cylinder, ect? Try turning ignition on and let it on for 10 minutes and then turn off. Repeat this 3 times. If system just went crazy( wont let you start vehicle) there may be larts that need to be ficed/replaced.

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If this doesn't fix it, send another message, I have the Saturn technical service manual on this car.

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This is most likely the anti theft security system shutting you down. Do you see a light that says security on the dash? If so, click this link for info and options.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

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Might also be the security system shutting down the starter. Common on GM vehicles. Heres a link on that. http://vatspasslockpasskeysecurityhelp.yolasite.com/

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Alot of the time the anti theft security can actually disable your starter. Check to see if there is a light on the dash that says SECURITY or a little picture of a car with a lock thru it. This would be a dead give away of the security problem. Check out this link for info and DO IT YOURSELF solutions to this problem.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

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