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You can't remove the lens cover. The tail lights are molded as one piece. If you want to change the bulbs, there should be an access panel inside the truck box right behind the tail lights that gives you access to the bulbs. There are also screws to remove the entire tail light assembly if it needs replacing.
Open the trunk, and pull back the carpet behind the tail light assembly-- you should see 3 different sets of wires going into the back of the tail light assembly. Pick the one you need to replace, and give it about a quarter turn counter-clockwise, and the bulb, harness, and wire can be pulled out of the tail light. Replace the burned out bulb in the socket, and reinstall the bulb just as you removed it. If you have difficulty getting to the wiring harnesses to dislodge them from the tail light assembly, you can remove the tail light entirely by unscrewing the black plastic wingnuts that hold the tail light assembly in place. It may take a little bit of effort to get them started, but will allow you to see what you are doing a bit better.
process for replacing tail light bulbs is the same in all models. If
you have a burnt-out tail light bulb, you may need to replace the
brake light, the reverse light or the turn signal. The procedure to
replace each of the bulbs is the same.
Open the Hummer's rear swing gate. This will expose the edge of the
vehicle's tail light assembly. You'll see two small Phillips head
screws that hold the tail light assembly in place. Put on your
Remove the two screws from the tail light assembly. Pull the tail
light out and inspect the back for two bulbs. The top bulb is the
brake light and turn signal. The bottom bulb is the reverse bulb.
Determine which bulb you need to replace.
the bulb's socket counterclockwise to disconnect it. Unplug the bulb
from its socket.
the replacement bulb into its socket firmly. Insert the socket back
into the tail light. Turn it clockwise to secure it in place.
the tail light into its cradle. Hold it with one hand and replace
the Phillips head screws with the other.
Open the trunk, from the inside remove the side trunk liner (by removing the plastic tabs the liner can be pulled back). Once the liner is pulled back you will need to remove two nuts which secure the tail light in place. Once the two nuts are removed you can start pulling the whole tail light assembly out. There are two other tabs that secure the tail light in place which may give you some resistance but the light should come out without too much force once the two nuts are removed. Once the tail light is out you can change whatever bulbs you need to.
Reach in and you'll feel a large finger-grip able nut, back it off (DON'T DROP IT) and place it somewhere retrievable. Take a small-flat-bladed screwdriver and wrap it in cloth so you don't scratch the paint. Poke said protected blade between the inside body joint and the tail light, gently pry tail light out. Remove offending bulb, replace with new. Installation is, as they say, the reverse of removal.
Sounds like one of two possibilites, the light itself may be a double filiament meaning there is one bulb which does both tail light and brake. One of the filiaments in the bulb could be burned out, try changing the bulb. If not that, then the realy might be damaged which gives power to the tail light. It's a bit of a bigger problem to diagnose.
Do you know if the brake light bulbs are working? (are the bulbs good?). (the bulbs have two parts, one for brake lights the other for running lights) If the third brake light bulb is working the brake lights should be with good light bulbs.