I'm actually a bit confused by this as well. I didn't get the back seat DVD player, but I thought I had the highest end MyGig available (nav, etc) and my dealer told me it would work with my ipod. However, no connection is present. If I plug the ipod into the USB port on the front of the stereo, I'm only given the option to download pictures/mp3s.
Does anyone know of an aftermarket solution?