WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Charging Schematic (HP2)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Power, Ground & Data Communication Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Battery Modules & Drive Motor Battery High Voltage Manual Disconnect Lever Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 4: Main Power Contactors Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 5: High Voltage Interlock Circuit (HVIC), Contactor Control Circuit Schematic