Outside Convex Mirrors; Outside Heated Mirrors - GMC 2003 GMT560 T-Series Owner's Manual

Outside Convex Mirrors

Your vehicle has convex mirrors on the lower quarter of
both the driver's and passenger's side rearview
mirrors. A convex mirror's surface is curved so you can
see more from the driver's seat.
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CAUTION:
A convex mirror can make things (like other
vehicles) look farther away than they really are.
If you cut too sharply into the right or left lane,
you could hit a vehicle. Check your regular
outside mirrors (or your inside mirror, if you
have one) before changing lanes.
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Outside Heated Mirrors

If your vehicle has this feature, your outside rearview
mirrors can be defrosted.
Push the bottom of the switch to turn the outside heated
rearview mirrors on. The switch indicator light will
come on and stay on whenever the outside heated
rearview mirrors are activated.
Your rear window defogger will also come on each time
this feature is activated.
The switch for this feature
is located in the instrument
panel switchbank.