WARNING: This page is about a different car, the 2003 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Charging System Diagnostic Table (Steps 1 - 6)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Charging System Diagnostic Table (Steps 7 - 16)
Courtesy of GENERAL MOTORS CORP.
Fig 3: Charging System Diagnostic Table (Steps 17 - 19)