I have a 99 chevy venture van, and my stereo wont work unless the passenger door is open. This is an odd problem and i was wondering whats wrong! All four speakers dont work unless i open the passenger door, and when i do they fade in and work perfectly,but as soon as i close the door they all stop working. Sometimes they will keep working even after the door is closed, but when i hit a bump they stop again. Can anyone help? Thanks!!