I was installing my cable for my zune (3.5mm to RCA) and when I finished, only my back speakers and my subs were working. So...i checked it again, and there's nothing that i can think of to do that will make the fronts work. I changed the fader on my deck, and when i put it to the front, it plays the rear speakers louder. Anyone got an idea?

 

This happened to me. make sure the wires weren't crimped when you re-installed the dash.