I would guess he didnt install it right, judging from his previous post it looks like he just bought this, unless he found the terminals and gps antenna and installed it in record time I woudent doubt if he had problems getting all the buttons or features working. Maybe he just did a simple swap and expected it to work. I would assume the NAV portion woudent work at all without the VSS wire and gps antenna attached.jteolis said:WAIT, are you saying it was working and then stopped working, or that its hasn't worked properly since you made the switch.
I'd check all your wires and contacts, use dielectic grease in the plugs. Make sure it isn't the hook ups.