dealer brought out a new key for my 98 deville per vin and measured it @ 4.75 KOHM. I found a 4.7 kohm resistor and wired it in under the dash .Still get starter disabled due to anti theft . Former owner had tried shorting it straight across .. he said wiggling the key would sometimes work before and after he did shorted it, it worked for a while.car has now been sitting for some months with no battery. Is there something I need to reset or reprogram?
former owner built up the sides of the key insert with solder as they were worn down. no I can't measure it. Is this machine you mention a dealer only device?
I don't know if they make an aftermarket version, but every GM dealer should have one. You are looking for a VATS interrogator.