WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Cruise Control Module And Switch Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: Cruise Control Module And Indicator Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 3: Cruise Control Servo And Stoplamp Switch Schematic