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Data Communication Schematics

WARNING: This page is about a different car, the 2009 Chevrolet HHR. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: DLC Power, Ground & Low Speed GMLAN Circuit Schematic
GM2085365Courtesy of GENERAL MOTORS CORP.
Fig 2: High Speed GMLAN Circuit Schematic
GM2085367Courtesy of GENERAL MOTORS CORP.