Thanks for ur help.I am in detroit. yes we can get the DVd from changer, but can not get that from RES like in factory installed. Also we are more interested in getting that nav to back screen as kids are more intersted in nav than DVD.
I was wondering that wire might be there (there might be a wiring harness which at one side is conneted to head unit of nav system and other side connected to RES). If that is the case, all we have to do is to connect them.......