Question about 1999 Chevrolet Monte Carlo

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Security Light On

Car would not start after driving it for weeks after security light came on.Replaced lock cylinder as recommended by mechanic,still won't start.Is it possible to reset ignition system myself...99 Monte Carlo 3.1

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The security system (VATS/PassKey) is having problems, it's typical on those cars. You can find a great write-up here: http://newrockies.ca , it was the only thing that saved my Park Avenue.

Posted on Sep 10, 2010

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Posted on Jan 02, 2017

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Security light and ABS light stays on


The security, antitheft or lock picture/icon 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 misinterprets 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 explains it pretty well.
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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.
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The theft deterrent module probably isn't energizing the theft deterrent relay . Most of the problems with this anti-theft system is that the contacts inside the ignition key lock cylinder wear out an can't read the resistor pellet on the key or the wires on the back of the key lock cylinder break . This all mean the key lock cylinder probably needs to be replaced .Or you can do a by pass !

GM VATS Key Resistor Key Security Bypass

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I have a 2001 chevy malibu. The security light was on constant, not blinking. I tried the relearn procedure 10 minutes on 5 seconds off. The security light stayed on. Replaced the ignition lock cylinder....


You are correct, the vehicle is not getting fuel. The security system shuts off the fuel injectors. Check out this link, there is good info there for ya. http://www.diy-gm-security.com/

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I drove the car to my mothers yesterday, went to my dads got there just finr. We went to leave and the car won't start turn over nothing. The security light is flashing. My dad could get it to start from...


you need to get a new ign. lock cylinder and chip key. Or you can get a lock cylinder and copy your old key with a regular key no chip. Take new cylinder, put old chip key in it. Plug into harness at the bottom of steering column just behind the dash, fine orange wire from existing one in the column. Hide lock cylinder under dash and start car with copy of old key.

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I had my ignition cylinder & housing replaced now my car won't start. How do I reset the passlock system so my car will start


Hello, Try this: Get in car, turn the key to start, when it don't start let key come back to run (do not turn off) The security light should be blinking, let car set for about ten minutes or until security light stays on steady at that time turn key off for 10 seconds then turn back on (do not go to start) security light will be blinking again wait 10 minutes and security light should go out. Turn key off, wait 10 seconds . Turn key on (do not go to start) security light will be blinking again, wait 10 minuets and security light will go out. AT THIS TIME TURN KEY OFF FOR 10 SECONDS THEN START THE CAR.

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usually if there is a security problem on the car , it has to do with the ignition cylinder being that is where the passlock is located . the module has to see a certain resistance when the key is turned to varify that the key is being used rather then someone breaking the cylinder apart when being stolen. Try when the security light is flashing , to leave the key in the on position for 10 minutes to see if the security light stops flashing ,make sure you battery is good , if this works , when the light stops flashing , the vehicle should start. if it does then replace the ignition cylinder and reprogram the module.

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I have the same car, I had my car fixed at the dealer. The problem is the ignition lock cylinder (where the key goes). It cost me about $340 (parts and labor). What has happened is that the cylinder is not sending the info to the starter to start the car. I guarantee you this is your problem too.

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With the new lock cylinder in it, turn the key on. The security light should blink. Leave the key on for 10 minutes, the security light will quit blinking and go out after 10 min. This will reprogram your security system and the car should start. Also leave a battery charger on it while the key is on, If the battery goes dead during the 10 minute reprogram sequence, you will have to start over again.

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