2003 GMC Sonoma Owner's Manual - Page 323

Taillamps 1. Open the tailgate. 2. Remove the screws from the lamp assembly near the tailgate latch. Replacement Bulbs Exterior Lamp Halogen Headlamps Composite Low-Beam Composite High-Beam Bulb Number 9006 HB4 or 9006 LL 9005 HB3 3057 Tail and Stoplamps 194 Rear Sidemarker LamDs 194NA Front Sidemarker Lamps Front Turn Signal Lamps 3457A 211-2 Center High-Mounted Stoplamp *For replacement bulbs not listed here, please consult your dealer. 3. Pull the assembly away from the pickup side panel. 4. Turn the socket counterclockwise to remove it. Push the tab in while you turn the socket. 5. Pull the bulb out. 6. Push the new bulb into the socket. 7. Put the socket into the assembly and turn the socket clockwise until it locks in place. 8. Reinstall the assembly. Install and tighten the screws. 9. Close the tailgate. 5-60