2004 GMC Sierra 1500 Pickup Owner's Manual - Page 466

Front Turn Signal, Sidemarker and Daytime Running Lamps 1. Remove the headlamp assembly as mentioned previously. 2. Press the retainer clip, located behind the turn signal housing, towards the outside of the vehicle. 3. Pull the turn signal housing out from the vehicle. 4. Press the locking release lever, turn the bulb socket counterclockwise and remove the socket from the turn signal housing. 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. A. B. C. D. Sidemarker Lamp Retainer Clip Front Turn Signal Lamp Daytime Running Lamp 8. Reinstall the turn signal housing onto the vehicle, placing the hook and posts on the inner side into the alignment holes, and the outer side into the retainer bracket. Push until you hear a click. 9. Reinstall the headlamp assembly. 5-66