Removal Procedure

WARNING: This page is about a different car, the 2002 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Pull back the instrument panel (IP) carrier far enough to gain access to the ambient light sensor (2). Refer to IP CARRIER REPLACEMENT in Instrument Panel, Gages, and Console.
Rotate the ambient light sensor a 1/4-turn to release the sensor from the defrost duct (1).
Disconnect the electrical connector (3) from the ambient light sensor (2).
Remove the ambient light sensor (2).

Fig 1: Removing Ambient Light Sensor
Courtesy of GENERAL MOTORS CORP.