SOURCE: my security light in my
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The Passlock "system" causes the security light to blink intermentally. When this occurs, the PassLock security system shuts off the fuel to the car and the car will not start for about 10 minutes. After about 10 minutes, it starts fine. Leave the key to "ON" position for 10 minutes. You will hear clicking noises coming from within the dash after 10 mins. This means you can now start your engine. You might need to replace the passlock sensor to resolved the problem. You may try the alternative key in doing this.
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SOURCE: how to reset or override anti theft in 96 grand am
Unfortunately this has been a real problem on GM vehicles for a very long time. I copied this to help you understad how this works.
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.
http://vatspasslockpasskeysecurityhelp.yolasite.com/ This link should help you
Yes, unfortunately this is very common on GM vehicles. Go to this link for everything you need. Rule of thumb is this. If the light is flashing, the problem will be In the ignition or the smart transponder key. If the light is solid, the problem is in the TDM (theft deterrent module). This is the main computer for the theft system. There is a full bypass method on this link listed under PERMANENT FIX. This is what you will need. It will bypass every aspect of the system 100%.
http://vatspasslockpasskeysecurityhelp.yolasite.com/
SOURCE: theft system 99 sunfire
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/
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