Just to be clear, you put the key in the ignition and turn it to the on position and then put 12 volts to the starter and the engine starts and runs or does it only crank but not start?
If the vehicle will not turn over with the key in the ignition then I have to assume we have an ignition switch issue and not a security issue.
I attached the way your PATS system works for your review and as you can see the PCM is not commanded on unless it is told that there is a good key in the ignition. So if the vehicle starts by jumping power to the starter then the PCM has to be getting a good signal from the key.
If this is the case then we need to crank the engine with the key and check voltage at the starter.
Here is a guide that will help with that:
I attached the wiring diagram as well for your review. Let us know and we can go from there. Thanks
Images (Click to enlarge)
Thursday, January 7th, 2021 AT 4:46 PM