My car is actually a 1997 Skylark. Passlock problems.
I changed the key, ignition cylinder and passlock all in one, and done multiple 10 and 30 min relearns to no avail. The “theft system” light never stays on solid or blinks, more like a soft flitting. Even then the light is weak compared to the other dashboard lights. Battery is brand new and I also keep a well charged battery pack on it while I do this. I'm at the end of my rope.