Chances are you have a key with a resistance pellet in it. Set your mulitmeter to ohms and put one lead on each side of the key. You need to find that resistance on the GM VATS code list (1-15 all different resistances). Then you need to go here
http://ecklerscamaro.com/ and buy the security system override, its like 30 bucks. Pull the hush panel off underneath your steering wheel and plug it in. Problem fixed. Go here to find your VATS code # by resistance.
http://www.likeabigdog.com/column/VATS.htm