WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Instrument Panel Cluster (IPC)
Courtesy of GENERAL MOTORS CORP.
Fig 2: Body Control Module (BCM)
Courtesy of GENERAL MOTORS CORP.
Fig 3: Powertrain Control Module (PCM) 2.2 L (L61)