2001 GMC Yukon Owner's Manual - Page 130

Outside Manual Adjust Mirrors Adjust your outside mirrors so you can just see the side of your vehicle and have a clear view of objects behind you. The mirrors can be folded in to enter narrow areas. The use of hood-mounted air deflectors and add-on convex mirror attachments may adversely affect mirror performance. Electric Outside Rearview Mirrors (If Equipped) The controls are located on the driver's door armrest. Camper-Type Outside Mirrors (If Equipped) Move the upper control to the left or right to choose the mirror you want to adjust. Then press the arrows on the lower control pad to adjust the mirror in the direction you want them to go. Heated Outside Rearview Mirrors (If Equipped) If your vehicle is equipped with camper-type mirrors, they can be adjusted so you can have a clear view of objects behind you. Pull out the mirror head to extend it for better visibility when towing a trailer. The outside rearview mirrors with this option feature a defrost mode. To turn on the defrost feature, press the rear window defogger button. See "Rear Window Defogger" in the Index for further information. 2-52