Do the rear seat dvd and screen have its own module that controls it or is the main controller for the dvd system in the dvd itself? I cant turn it on, so i got no power in the dvd, fuses are ok, no function in the screen.. And i really hate to have stuff in my cars that dont work so this is something that has to be fixed. Any idea on what this might be? Is the DVD system in the rear connected to the optics also when i have the Hifi Pro navi system? I got a most-ring error, and im thinking that if it is connected to the ring it might be that dvd system thats the problem.