the fp resister (fp stuck on high) mod has nothing to do with the vats/passkey3 system

bad key chip, failed reader around the ign lock cyl, relearn or wiring problem.

connect charger,
try to start car, let die, leave key in run position for 10minutes and a few seconds, off for less than 30seconds, back on for10+, off, then back on for another 10+ then it should be learned and let it start and run
doors/windows/hvac should be oiff and not used while learning