Video Out On Dvd Nav. System

[Bobby M]

I have a 7 inch 12 volt video screen. I would like to use it as an add on to my navigation system in my 2007 GX470 to work like a rear seat entertainment system. I am trying to find out if there is a video output jack or video out wire on my DVD nav. system. I assume there must be a video out to work when the optional rear seat entertainment center is installed . This video output must work even when the car is moving. Does anyone have any information on this. I would like to know if this output exist and where to find it and color of wire. I don't have the optional rear seat entertainment system and I though this might be a cheap way to add it.