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Headlamp Automatic Control Ambient Light Sensor Replacement

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Headlamp Automatic Control Ambient Light Sensor
GM2020211Courtesy of GENERAL MOTORS CORP.
Callout Component Name
1 Windshield Defroster Nozzle Grille Retainer (Qty: 8)
Procedure: 
Disconnect the electrical connections.
Tip:  Use a flat-bladed plastic trim tool to aid in the removal of the windshield defroster nozzle grille.
2 Headlamp Automatic Control Ambient Light Sensor