WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Driver Door Module Power and Ground Schematics
Courtesy of GENERAL MOTORS CORP.
Fig 2: Front Passenger Door Module Power and Ground Schematics
Courtesy of GENERAL MOTORS CORP.
Fig 3: Door Lock, Unlock Relays Schematics
Courtesy of GENERAL MOTORS CORP.
Fig 4: Rear Door Latch Assemblies Schematics
Courtesy of GENERAL MOTORS CORP.
Fig 5: Middle Door Latch Assemblies Schematics - V4U