How do you change turn signal bulb in 2010 Buick lacrosse side mirrors?

To change the turn signal bulb in the side mirrors of a 2010 Buick Lacrosse, first, ensure the vehicle is turned off and the key is removed. Carefully remove the mirror cover by gently prying it off using a plastic trim tool to avoid damage. Once the cover is off, locate the bulb socket, twist it counterclockwise to remove it, and replace the old bulb with a new one. Finally, reassemble the mirror cover by snapping it back into place.