WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Refer to illustrations to identify SIR connector terminals. See Fig 1 - Fig 4
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Fig 1: Identifying SDM Connector Terminals
Courtesy of GENERAL MOTORS CORP.
Fig 2: Identifying Front End Discriminating Sensor Connector Terminals
Courtesy of GENERAL MOTORS CORP.
Fig 3: Identifying Driver-side Air Bag Module Connector Terminals
Courtesy of GENERAL MOTORS CORP.
Fig 4: Identifying Passenger-side Air Bag Module Connector Terminals