Question about 1999 Chevrolet Monte Carlo

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Security light is on and will not go off - 1999 Chevrolet Monte Carlo

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  • SHARONHAN29 Aug 02, 2008

    I am also having the same problem mine goes on and off while I am driving. and sometimes it stays on. Today it came on. So I decided to park and turn off my car too see if it would go off, well when I tried to start my car it wouldn't start. After 5 min it started again and the pesky security light went off. And so far my car is starting ok. Does anyone know what might be causing this? Could it be the key, computer, or starter. Please Please let me know thanks

  • Anonymous Sep 02, 2008

    security light came after adjusting steering tilt and now won't go off

  • lovegm Oct 19, 2008

    We have a 1999 Tahoe. Security light goes on and off while driving. Sometimes Tahoe will not start until key in ignition for 10 minutes in 'on' position. Thought it may be the resistor, but our remote start bypass has had a few issues with starting now too, which bypasses the factory resistor. I can't see replacing the ignition switch going to make a difference since my remote start bypass does this already. GM tells me I can't turn the security off, even though it does not provide an anti-theft device, and serves no real purpose. Is it possible to reset the computer to eliminate the security? or at least reduce the wait time from 10 minutes to 1 minute?

  • technico Nov 26, 2008

    1999 Monte Carlo. Security light was visible for two trips, then car would not start - no power to solenoid despite good battery.
    Called AAA to tow it - and it started up after pushing the car about 20 feet.
    Mechanic says this is a known problem, only the dealerships can resolve.


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Your getting a bad connection . you need to replace your pos. battery cables as well as the connector in front of the fuse box . i have had this same problem before . but before that try this , there is a red wire that connects to the bottom of the pedastill in front of the fusebox its like a 8mm bolt . take that off and clean the connector with some sandpaper for a better connection .

Posted on Mar 06, 2009

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If the Security Light is on but is not flashing, the security system is fine. If the security light is flashing then turn the ignition key to the run position (do not start). Wait over ten minutes and then try to start the engine. After the ten minutes you should notice that the light stopped flashing. If the engine starts then you do have a problem with the Passlock Security System.

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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).
These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending
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When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode.
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Here is a link that will help with the SECURITY light.

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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. These 3 parts are in CONSTANT communication. If the key is in the ignition, 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 goes into antitheft mode. The car 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.
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Is the security light on when you try to start the car and leave the key in the run position? Does the security light flash when the key is left in the run position after you try to start the engine? If so, let the security light flash until it stops, turn off the key for 30 seconds, then try to restart the engine. If the engine starts and the security light stays off have someone get the codes out of the security system and have it fixed properly.

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Everything you need to know is on this link

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