2003 GMC Yukon Owner's Manual - Page 140

Outside Camper-Type Mirrors Outside Power Mirrors If your vehicle is equipped with power outside mirrors, the controls are located on the driver's door armrest. If your vehicle is equipped with camper-type mirrors, they can be adjusted so you can have a clear view of the objects behind you. Pull out the mirror head to extend it for better visibility when towing a trailer. Move the selector switch located above the control pad to the left or right to choose the mirror you want to adjust, then press the dots located on the four-way control pad to adjust the mirror. The mirrors also include a memory function which works in conjunction with the memory seats. See "Memory Seats" in the Index for more information. 2-46