Removal Procedure

Remove the front grille. Refer to GRILLE REPLACEMENT (GMC) or GRILLE REPLACEMENT (OLDSMOBILE) or GRILLE REPLACEMENT (CHEVROLET) in Exterior Trim.
Remove the sensor (1) from the panel assembly (2).

Fig 1: Removing Sensor From Panel Assembly
Courtesy of GENERAL MOTORS CORP.
Disconnect the electrical connector from the sensor (1).

Fig 2: Disconnecting Electrical Connector From Sensor
Courtesy of GENERAL MOTORS CORP.