2003 GMC Yukon Owner's Manual - Page 413

5. Remove the old bulb from the bulb socket. 6. Put the new bulb into the bulb socket. Use care not to touch the bulb with your fingers or hands. 7. Put the bulb socket into the turn signal housing and turn it clockwise until it locks. 8. Put the turn signal housing back onto the vehicle placing the hook and posts on the inner side into the alignment holes first and then the outer side into the retainer bracket. Push until you hear a click. 9. Put the headlamp assembly back into the vehicle. 4. Unplug the lamp assembly harness from the housing. 5. Unplug the lamp. 6. Put in a new lamp and snap it into the housing. 7. Reinstall the lamp housing. Roof Marker Lamps 1. Remove the two screws and lift off the lens. Side Identification Marker Lamps 1. To expose the service slot, locate the lamp gasket near the rear wheel, and pull back the edge. 2. Using a flat tool, push into the slot to release the lamp housing. 3. Pull the housing out to expose the wiring harness and connector. 5-55