How do you replace the rear turn signal bulb in a 2003 GMC Sonoma?

To replace the rear turn signal bulb in a 2003 GMC Sonoma, first, open the rear tailgate and locate the access panel on the back of the taillight assembly. Remove the screws or clips securing the panel, then gently pull it away to access the bulb socket. Twist the bulb socket counterclockwise to remove it, replace the old bulb with a new one, and reassemble the socket and access panel. Finally, test the turn signal to ensure it’s working properly.