WARNING: This page is about a different car, the 2002 GMC Safari and 2002 Chevrolet Astro. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Wipers Inoperative - All Modes Diagnosis (Steps 1-4)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Wipers Inoperative - All Modes Diagnosis (Steps 5-15)