Here's some info on VATS key system, easier to let you read it than re-type it all.
If you think the contacts are bad, you can pull the wires from them, and solder a resistor of the correct value in between them. That will satisfy the VATS system, but obviously you lose that passive theft deterrent.
http://www.thirdgen.org/vats_passkey_system
Not many people are looking to steal '95 Luminas anyway, I wouldn't sweat it, that's how I'll deal with it when mine pulls that stuff....