WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power Seat Inoperative (With Memory) Diagnostic (Steps 1-3)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Power Seat Inoperative (With Memory) Diagnostic (Steps 4-11)