July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Section 3 (System Wiring Diagrams): Radio
WARNING: This page is about a different car, the 2003 Porsche Boxster. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Radio Circuit, W/ Bose
Fig 2: Radio Circuit, W/ Navigation, W/ Bose (1 of 2)
Fig 3: Radio Circuit, W/ Navigation, W/ Bose (2 of 2)