WARNING: This page is about a different car, the 2004 Porsche Boxster. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Radio Circuit, W/ Bose W/O Navigation
Fig 2: Radio Circuit, W/ Navigation, W/ Bose (1 of 2)
Fig 3: Radio Circuit, W/ Navigation, W/ Bose (2 of 2)