I have a 2001 ford windstar minivan and my car radio keeps jumping from radio to cd all the time when I turn both ways or when I am just driving everything lights up still works but there is no cd in the cd player so it automatically goes back to radio when it realizes there is no cd in there, but it goes back and forth all the time to where I have to put my hand on the fm button the whole time I am driving so I can switch it back. please help I have no idea??????