WARNING: This page is about a different car, the 2003 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power Seat Systems Component View - Seat Belt Warning System
Courtesy of GENERAL MOTORS CORP.
Fig 2: Power Seat Systems Component View - Front Seat Belts
Courtesy of GENERAL MOTORS CORP.
Fig 3: Power Seat Systems Component View - Rear Seat Belts