WARNING: This page is about a different car, the 2004 Chevrolet Monte Carlo and 2004 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Ground, Power, and RAP Relay Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Data Link, Door Locks, and Door Lock Switches Schematic