GMC Sonoma 2001 Owner's Manual page 306

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Two Piece Composite Headlamp System
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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5. Turn the bulb assembly counterclockwise to remove
it from the headlamp assembly.
6. Put the new bulb into the bulb assembly and reinstall
it in the headlamp assembly by turning it clockwise
until it is tight.
7. Plug in the electrical connector.
8. Put the headlamp lens assembly back into the
vehicle. Install the two retaining clips.