1999 GMC Sonoma Owner's Manual - Page 274

yellowblue Headlamps One-Piece Composite Headlamp System 1. Open the hood. 5. Turn the bulb assembly counterclockwise to remove it. 6. Put the new bulb assembly into the headlamp assembly and turn it clockwise until it is tight. 2. Remove the black retainer clips by lifting up. 3. Pull the headlamp assembly out. 4. Unplug the electrical connector. 7. Plug in the electrical connector. 8. Put the headlamp assembly back into the vehicle. Install the two retaining clips. 6-36