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Radio/Navigation System Schematics

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2007 GMC Savana Special, 2007 GMC Savana Camper Special, 2007 GMC Savana, 2007 Chevrolet RV Cutaway, and 2007 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground, Serial Data, Antenna, and Front Speaker Outputs
GM1754545Courtesy of GENERAL MOTORS CORP.
Fig 2: Rear Speaker Outputs
GM1754552Courtesy of GENERAL MOTORS CORP.