GMC 2002 Yukon XL Owner's Manual page 141

Camper-Type Outside Mirrors
(If Equipped)
If your vehicle is equipped with camper
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.
Electric Outside Rearview Mirrors
(If Equipped)
Move the selector switch located above the control pad
-
type mirrors,
to the left or right to choose the mirror you want to
adjust, then press the arrows located on the control pad
to move the mirror in the direction you want it to go.
The controls are located on
the driver's door armrest.
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