WARNING: This page is about a different car, the 2003 Lincoln Aviator. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Base Radio Circuit
Fig 2: Premium Sound Radio Circuit, DM100
Fig 3: Premium Sound Radio Circuit, W/ Navigation (1 of 2)
Fig 4: Premium Sound Radio Circuit, W/ Navigation (2 of 2)