WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying HVAC Control Panel Black 8-Pin Harness Connector C1 Terminals
Courtesy of GENERAL MOTORS CORP.
Fig 2: Identifying HVAC Control Panel Green 16-Pin Harness Connector C2 Terminals
Courtesy of GENERAL MOTORS CORP.
Fig 3: Identifying Blower Motor Resistor Harness Connector Terminals