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Unfortunately if resetting the system didnt work you are going to need to get your hands on a decent scan tool that is factory specific to get the data needed to figure this out. I hate to send people to the dealer but on this particular issue they are probably the best equipped to handle this issue and will end up being your cheapest and most accurate approach at getting this fixed.
You would start by checking for codes in the navigation unit.
Just out of curiousity have you tried to activate the DVD player from the backseat console?
Using the scan tool.