Security system will not let the car start until it resets itself

Saturntech has given you the proper way to approach this problem but let me add this. The most common failure here is the Passlock sensor in the ignition switch. They fail quite often. You could change the whole lock or I can give you a way to permanently bypass that component. The rest of the system will have to be working correctly so if the problem is something else, this won't work.

PASSLOCK SENSOR BYPASS

If you find the black wire and the yellow wire from the passlock sensor in the column you can solder in a 2.2 K ohm resistor and then attempt to start the car. It will stall don't turn the ignition off. Let the ignition on for ten minutes or until the theft light goes out. Turn the key off for ten seconds then attempt to start the car. If it now runs you have been successful. If it doesn't you either made a mistake or there are other problems besides the ignition lock cylinder.

Hello,

This security reset issue is likely due to a faulty ignition switch. When the key gets turned the switch sends a signal to the pass lock and the car will start.
If the sensor goes bad in the switch it will not allow the car to start and the anti-theft light will be illuminated.

Here is a helpful video:

https://youtu.be/pM8-ugbMDTs

I have attached diagrams for the replacement procedure.

Please let me know of any questions.
Thank you.