WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Body Control Module (BCM) Scan Tool Data
Courtesy of GENERAL MOTORS CORP.
Fig 2: Identifying Scan Tool Data List
Courtesy of GENERAL MOTORS CORP.
Fig 3: Identifying LG8 Powertrain Control Module (PCM) Scan Tool Data
Courtesy of GENERAL MOTORS CORP.
Fig 4: Identifying L36, L67 Powertrain Control Module (PCM) Scan Tool Data