Does anybody know how to unblock the navigation so it can play dvd's. I have a 2002 camry, originally it had the stock radio, then i purchase the navigation unit but i had to purchased a special plug to adapt it so that at least the radio could play. I like the unit but I want to be able to play dvd's, i can't put the navigation either because i need to purchase special hardness and is too expensive. you guys know if it can be done?? I would rather keep the stock navigation unit than getting an aftermarket dvd player....but am still undecided.