2003 GMC Sierra 1500 Pickup Owner's Manual - Page 145

Outside West Coast-Type Mirrors If your vehicle is equipped with the west coast-type mirrors, they can be adjusted so you can have a clear view of objects behind you. A. Outer Mirror Frame B. Mirror Head C. Nut Outside Power Mirrors If your vehicle is equipped with power outside mirrors, the controls are located on the driver's door armrest. 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 can be adjusted by turning the mirror head (B) and moving the outer mirror frame (A) backward or forward. You can also loosen the nut (C) on the top and bottom of the outer mirror frame to tilt the mirror head. The mirrors also include a memory function which works in conjunction with the memory seats. See "Memory Seats" in the Index for more information. 2-58