Does anyone know if the back of the factory nav system has an rca type of input? I see that there is one on the back of the center console but that only works with the rear DVD right? I'm thinking of buying one but my mp3 player has rca output for video so I'd rather use that as opposed to the headphone cable. I have considered getting an aftermarket nav system but then it wouldn't talk to the HUD or the cargo area controls. Thanks for the help.