Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Ensure the headlamp switch is in the OFF position.
Remove the high mounted stop lamp screws.
Remove the high mounted stop lamp from the vehicle.
Disconnect the electrical connector.

Fig 1: Removing High Mounted Stop Lamp
Courtesy of GENERAL MOTORS CORP.