GMC 2003 C4C042 Owner's Manual page 137

Power Outside Rearview Mirrors (If Equipped)
If you have power outside rearview mirrors, they can be
adjusted from inside the vehicle.
Select the mirror you want to move by turning the
switch clockwise to adjust the passenger's side mirror,
or counterclockwise to adjust the driver's side mirror.
The center position is neutral.
Then, adjust the mirror by pressing the outer arrows on
the switch until the mirror is in the desired position.
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The control for this
feature is located on
the driver's door.
Heated Outside Rearview Mirrors (If Equipped)
If your vehicle has this feature, your outside rearview
mirrors can be defrosted.
Press the bottom of the switch to turn the heated outside
rearview mirrors on. The switch indicator light will be
come on and stay on whenever the heated outside
rearview mirrors are activated.
Your rear window defogger will also come on each
time this feature is activated. If your vehicle has a rear
window defogger, See "Rear Window Defogger" in
the index.
The switch is for this
feature is located in the
instrument panel
switchbank.