Mercedes S500 Navigation

Ok guys I have a question, a customer of mine wants to know if there is anyway to hook up the indash navigation screen to an aftemarket DVD player in his S500. I haven't done nothing like that before so any ideas/suggestions/can/can't would be appreciated. Thanks in advance.

You can add video to some OEM nav screens through an aux video adapter, these units basically loop through the input into the screen and allow you to add the aftermarket DVD video input. However, I was doing reseach for an ML 55 AMG with in dash nav and on that particular mercedes, the video input from the factory was actually a component video input, and that there was no easy way to add video to that particular setup

Thank you for the reply. If anybody has any other takes on this one I will be thankfull.