1997 Sunfire won't start. Anti-theft light flashing

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How do I reset and anti theft sytem in 1997 Chevy Cavalier?

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Jul. 8, 2012 - 1-Turn ON the ignition, with the engine OFF. 2-Attempt to start the engine, then release the key to ON (vehicle will not start). 3-Observe the ...
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To reset the system, get in the car and shut the door. Turn the key on to the "Run" position without cranking the engine. Leave the key there for exactly 10 minutes. Turn the key to the off position without removing it and back to "Run" for 10 more minutes.May 1, 2021

How do you bypass the security on a 1997 Chevy Cavalier?

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Ford's PATS anti-theft system disables the starter from spinning the engine . Flashing real fast while trying to start the vehicle means the vehicle see's wrong key code ,think's the vehicle is being stolen . Code's stored in the computer , FORD dealer , nothing you can or should do .

Question edited for clarity and correct name of vehicle.

You can't bypass it Cherie, it involves transponder chips, receivers and the engine computer (ECM).. The anti-theft system is there to stop theft of the vehicle, basically what you are trying to do. You have to fix the system, not find a way around it. This is the reset. As long as you battery is good and fully charged, it should only need doing once.

Just leave the key in the run position and the "Theft System " light on the dash will be flashing. Leave the key on for about 10 minutes and the light will stop flashing and go on solid. Then the theft system is disable.

how to over-ride anti-theft so car will start? (Chevrolet Cavalier)

https://www.google.com/search?q=chevy+cavalier+theft+system+bypass

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The late-90's GM Passlock system (e.g. 1997 Malibu, Regal, Impala, etc.) has a part around the ignition tumbler that goes bad and no longer reliably detects the valid key. In that situation, the "Theft System" light will slowly flash and the carburetor is cut off so the engine won't start. The time-out on the system is 10 minutes - you don't have to do anything, you don't have to disconnect the battery, the key can be out of the ignition -- it's just a time delay. After 10 minutes, the light goes out and you can try again (but if the key is again not detected, the light will start flashing again and you have to wait another 10 minutes)
Someone else, who had this problem, told me to remove all other keys from my keyring. The weight of the other keys pulls on the ignition key causing the key to be unreadable. It has been 7 weeks since I have been doing this and have not had a problem

Try to start vehicle. Leave key in the on position until the theft light stops blinking (about 10 minutes). Turn the key off - leave off in ignition for about 10 minutes. Try to restart vehicle.

Pass Lock sensor is preventing the car from starting. You need to override it. I used a remote start module. Having this installed bypasses the pass lock sensor.

My 2000 cavalier has done this for 6 months. You take your key out then open your door, wait ten minutes and the system resets itself and the car will start-annoying you bet!!!

The problem is the new PCM you installed does not have the correct VIN number of your car.
You may be able to relearn the VIN using the preceedure below, however, there is no gaurentee it will work. You may have to have a dealer reset the VIN for you by way of a scan tool.

1) Instert key into ignition and rotate to run position (do not try to start engine)
2) Leave the key in the run position for 10 minutes until security light stops flashing.
3) Turn ignition key to off position for 10 seconds ( no more, no less)
4) Turn ignition to run position again for 10 minutes until security light stops flashing and repeat step 3 and 4 for (1) more cycle.

The process is a security verification step for the VTD system. ( Vehicle Theft Deterent)

Give it a try, let me know.
Regards,