I just had a Clarion Max675 installed in my 2008 Nissan Sentra.I also had a Clarion NAX970HD Navi unit put in as well.The problem I'm having is the navi unit is not recognizing what my location is.Could it be a speed sense cable needs to be connected?Also no video signals on dvd and ipod even with parking brake on.Could any one help?Thanks. mgun