We recently purchased a 2001 Expedition EB edition, it had a VHS system installed (don't ask me why it wasn't a dvd). The problem is I can't figure out how to turn the sound of the VHS on through the speaker system. There is wireless headphones the have dead batteries in them, but we would rather have it play through the rear speak system. Any help and/or suggestions would be greatly appreiciated. This may be a easy fix, but I can't figure it out.

Thanks,

Ryan