WARNING: This page is about a different car, the 2010 GMC Terrain and 2010 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Low Speed GMLAN (1 of 2)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Low Speed GMLAN (2 of 2)
Courtesy of GENERAL MOTORS CORP.
Fig 3: High Speed GMLAN (1 of 2)
Courtesy of GENERAL MOTORS CORP.
Fig 4: High Speed GMLAN (2 of 2)
Courtesy of GENERAL MOTORS CORP.
Fig 5: Enable Serial Data
Courtesy of GENERAL MOTORS CORP.
Fig 6: BCM Local Interconnect Network (LIN) Bus 1, 2, 3, 4 and Memory Seat LIN Bus
Courtesy of GENERAL MOTORS CORP.
Fig 7: Radio/HVAC Local Interconnect Network (LIN) Bus and CAN Graphical Interface