WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Door Lock Controls & Front Door Locks (AN3/DL3) Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Rear Door Locks (Crew Cab +AN3) Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Door Lock Controls (AU3 -AN3/DL3) Schematic