WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Cruise Control Schematics (Cruise Control Switch, Throttle Actuator Control Motor & Cruise Control Release Switch)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Cruise Control Schematics (Power, Ground & Stoplamp Switch)