there are three ways that the cruse control will disable itself under normal condisions(meaning no sneaky gremlins in the electrical system), the switch you are talking about, the brake switch, and the transmission range selector. a bad brake switch you could tell by just looking at the tail lights, and a bad range selector would cause driveably problems(trans wouldn't shift). assuming the switch is mounted on the turn signal arm, then on most cars the steering wheel needs to be removed from the shaft to remove the multi-function switch, including removing the air bag. if the switch is actuilly on the wheel next to the air bag, then i don't know. etherway, i do not recommend a DIYer to touch the air bag system - and for good reason. take it to the dealer.