GMC SIERRA DENALI 2002 Manual page 315

Headlamps
1. Remove the two pins on the top of the headlamp
assembly. To remove the pins, turn the outer pin
outward and pull it straight up. To remove the inner
pin, turn it inward and pull it straight up.
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A. Low Beam Headlamp
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B. High Beam Headlamp
2. Pull the headlamp assembly out.
3. Unplug the electrical connector.
4. Turn the old bulb counterclockwise and remove it
from the headlamp lens assembly.
5. Put the new bulb into the lens assembly and turn it
clockwise until it is tight. Use care not to touch the
bulb with your fingers or hands.
6. Plug in the electrical connector.
7. Put the headlamp assembly back into the vehicle.
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Re install and tighten the two pins.