Anti Theft problem

if were in my shop i would start at the fuse - relay box under the hood this is alot of different systems. look for corrosion, signs of heat or loose connections . also could be a common ground problem look under dash left kick panel

Is a sensor located in the steering wheel column .this sensor detects the transponder chip when this unit goes bad loss signal from the key. You can bypass it or replace it .good luck i hopes it helps.

How do u bypass

I'm having the exact same problem and I don't want to buy a bunch of different parts and not solve the problem, I was gonna buy a new key switch and keys but I see you tried that, I've seen and read this is a common problem with these cars, any suggestions for me to start with?