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 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Schematic - TV Antenna Module and Amplifiers, TV Rear Glass Antenna and Auxiliary RCA Video Jacks (Export w/U2Y/U2X)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Schematic - Traffic Information Receiver (Japan w/ U2X/U2Y)