Eeehhhh, I hope you get it to work. It sucks to have to take apart your car for a small problem like this. Try jumping your button while your at it too. If you get to the other side of it, touch a coin to the terminals and see what happens. You most likely have ground though. The entire chassis of the car is ground, therefore referred to as the "common ground" (cause every part of your car uses the same ground).