searched around but couldnt find exactly what im looking for. what do i need to install a avic D3 in a 04 escalade. has factory navi already in it, with bose and onstar. will that work with the bose speakers? crutchfield is no help because they no longer sell the avic d3 and i cant find out what harnesses i need ect. any information is greatly appreciated

It should be a Axxess / Metra GMOS - 04. I have a 2004 Z71 Tahoe and that is what I uses with Bose and OnStar. Now I did not have Navi built in from factory but it should be the same unit. To be honest though not sure I would trade your factory Navi for a D3, but either way good luck.