greetings,

If you have another ignition key try it. If you have the key fob/remote you can next try to lock and unlock the vehicle and then start. This system cannot be disabled. The anti theft works with the PCM and if the right signal is not received it will not enable to start. It would be best to check for codes if a scanner is available. Most parts stores scan for free but they only use minimum function scanners. If the anti theft light is flashing there is a system fault, it should go on with the key on and then go off after a few seconds.

let me know what happens

If you have a key that failed or the PATS receiver has failed you will need to get it repaired at a shop than can program the key. In most cases the dealership will be the only one with access to the vehicles security system with a diagnostic tool. Key fobs can be programmed without the diagnostic tool but not ignition keys. If you use the key or key less entry it disables the perimeter system. There are really 2 systems on this vehicle.

yes. It can be several causes like I said, the cluster can even be at fault. First the tech would look for trouble codes, then communication between the modules. You can check fuses , always a good place to start.