GMC 2003 Sonoma Owner's Manual page 319

Two-Piece Composite Headlamp
System
5. Turn the bulb assembly counterclockwise to remove
6. Put the new bulb into the bulb assembly and
it from the headlamp assembly.
reinstall it in the headlamp assembly by turning
it clockwise until it is tight.
7. Plug in the electrical connector.
8. Put the headlamp assembly back into the vehicle.
9. Install the two retaining clips.
IO. Close the hood.
1. Open the hood.
2. Remove the black retainer clips by lifting up.
3. Unplug the electrical connector.
4. Pull the headlamp lens assembly out.
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