Hey I have just purchased a new D3 and am here to learn how to install it. I have a stock 2004 GMC Yukon with Bose and OnStar. So far all I have is the D3 unit with the bluetooth adapter, a pioneer ipod adapter, and the pac swi. I am still searching through the forums but if anyone has any pointers I would appreciate the help.

Well, first of all you'll want to get one of these. http://www.crutchfield.com/App/Product/ ... =120GMOS01

Then get one of these.

http://www.crutchfield.com/App/Product/ ... =003GMK422

Then you'll need the location of your VSS wire (vehicle speed sensor). Someone else will have to help you there, however this might help.

http://www.avic411.com/forum/viewtopic.php?t=3258

If you're going to connect a rear camera then you'll also need to find your reverse signal wire (back-up lights). This will give you a good place to start.

thanks for the info, that gives me a good start