July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!
Navigation System Schematics
WARNING: This page is about a different car, the 2005 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Navigation Radio - U1A And UZ6 Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Navigation Radio and Remote CD Changer - U1A And UC6 Schematic