i just replaced my old in dash dvd player for the new n3 navi. my old unit allowed anything on my head unit to show on my headrest monitors. it seems the n3 only allows dvd's to appear. is this true?? is there a way for the navigation screen to appear on my headrests? the rear screens are blue unless its a dvd. no cd text, no menu screens, no nothing.please someone help me out on how to get anything to my headrests

sorry, not sure why it turned out all stupid. i hop esomeone can read that. the first sentence was supposed to only say...i just replaced my old in dash dvd player for the new avic n3