GMC 2002 Envoy - Manual (Page 125)

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Outside Mirrors
Adjust your outside mirrors so you can see a little of the
side of your vehicle.
Fold the mirrors in before before entering a car wash. To
do this, pull the mirrors in toward the vehicle. Push the
mirrors back out when finished.
Power Remote Control Mirrors
The control is located on the driver’s door.
Turn the control to the left or right to choose the mirror;
then press the control to move the mirror in the direction
that you want the mirror to go. To secure the mirror
settings turn the knob back to the center position.