2010 GMC Sierra 1500 Crew Cab Owner's Manual - Page 200

Outside Power Foldaway Mirrors Vehicles with outside power foldaway mirrors have controls located on the driver door. Resetting the Power Foldaway Mirrors Reset the power foldaway mirrors if: . The mirrors are accidentally obstructed while folding. They are accidentally manually folded/unfolded. The mirrors will not stay in the unfolded position. The mirrors vibrate at normal driving speeds. ... Fold and unfold the mirrors one time using the mirror controls to reset them to their normal position. A popping noise may be heard during the resetting of the power foldaway mirrors. This sound is normal after a manual folding operation. Mirror Adjustment 1. Press (C) to fold the mirrors out to the driving position. 2. Press (D) to fold the mirrors in to the folded position. Automatic Dimming The driver outside mirror adjusts for the glare of the headlamps behind you. See Automatic Dimming Rearview Mirror on page 3‑60 for more information. Turn Signal Indicator The vehicle may also have a turn signal indicator on the mirror. An arrow on the mirror flashes in the direction of the turn or lane change. 3-62