Quote Originally Posted by SyntheticShield View Post
I remember seeing some information stating that if the bulb(s) went out in your third brake light that that would cause the cruise control to not work. Dont ask me how, I just remember seeing that so it might be worth checking.

i remember reading this somewhere, but dont recall if it was for these cars or another GM product.. either way, doesnt hurt to check.

... though it could be the switch itself, also...