Hummer 2003 H2 Owner's Manual page 373

Center Roof Marker Lamps
1. Push in on the notch with a flat tool and pull the
lamp out.
2. Turn the bulb socket counterclockwise and remove it
from the lamp housing.
3. Remove the bulb from the bulb socket.
4. Put the new bulb into the bulb socket.
5. Place the hook end of the lamp in place on one side
and push the other end of the lamp down until it
locks in place.
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