WARNING: This page is about a different car, the 2008 Isuzu Ascender, 2008 GMC Envoy, and 2008 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power Seat Controls Schematic w/o Memory
Courtesy of GENERAL MOTORS CORP.
Fig 2: Power Seat Controls w/Memory Schematic - Power, Ground, and Switch Controls
Courtesy of GENERAL MOTORS CORP.
Fig 3: Power Seat Controls w/Memory Schematic - Motors and Position Sensors