WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Install the bulb into the socket.
Index the socket tabs to the backup lamp housing slots.
Position the socket to the backup lamp housing.
Rotate the socket clockwise until the retaining tab (1) is fully seated.