WARNING: This page is about a different car, the 2005 Mercury Mountaineer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Radio Circuit, W/ Audiophile System
Fig 2: Radio Circuit, W/O Audiophile System
Fig 3: Rear Seat Entertainment Circuit, W/ Audiophile System
Fig 4: Rear Seat Entertainment Circuit, W/O Audiophile System