I have this exact setup for the D3, so not sure about inputs, etc...and its in a Tahoe 03. I have the new adjustable mount from proclip USA with the passthrough jack. From there I have the Apple Composite + USB jack attached to the bottom of the proclip. The USP jack goes into a cigarette adaptor for charging and for the composite I got a 3 to 1 cable from Radio Shack that takes the composite to a midi jack. I have the midi plugged into the front of the N3. All cables are hidden behind the dash except where they plug into the cradle and N3.
I am able to watch videos, play music, phone