2003 GMC Sierra 1500 Pickup Owner's Manual - Page 438

Front Turn Signal, Sidemarker and Daytime Running Lamps 3. Pull the turn signal housing out from the vehicle. 4. Press the locking release lever, turn the bulb socket counterclockwise and remove it 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. 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. A. Sidemarker Lamp B. Retainer Clip C. Front Turn Signal Lamp D. DaytimeRunningLamp 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. 9. Put the headlamp assembly back into the vehicle. 5-63