2009 GMC Envoy Headlight Bulbs

You need to install the side marker bulb or turn signal/park bulb to the socket, wipe the bulb with a clean cloth to ensure the bulb is free of any dirt or oil, and install the bulb and socket to the headlamp by rotating the bulb and socket clockwise, locking the retaining tabs to the headlamp, install the headlamp, and close the hood.

Turn the fog lamp switch to the OFF position, rotate the bulb socket counterclockwise to release the socket from the fog lamp housing, remove the socket from the fog lamp housing, and remove the bulb from the socket.

You need to install the dome lamp bulb to the socket, install the reading lamp bulb to the socket, install the reflector to the dome lamp, position the lens to the headliner with the horizontal tab facing forward, position the horizontal tab above the headliner and push the lens forward to seat the tab, push upward on the rear portion of the lens, to seat the rear lens retaining tab, and pull down on the lens to ensure that the lens is secured to the headliner.