2009 Chevrolet Silverado 2500 HD Extended Cab Owner's Manual - Page 161

Outside Convex Mirror Outside Heated Mirrors For vehicles with heated mirrors: { 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 lane, you could hit a vehicle on the right. Check the inside mirror or glance over your shoulder before changing lanes. The passenger side mirror is convex shaped. A convex mirror's surface is curved so more can be seen from the driver seat. < (Rear Window Defogger): Press to heat the mirrors. Only the upper glass of the mirror is heated. The lower convex part of the mirror is not heated. Depending on the vehicle's features, see "Rear Window Defogger" under, Climate Control System (With Air Conditioning) on page 3-24 or Climate Control System (With Heater Only) on page 3-26 or Dual Automatic Climate Control System on page 3-28 for more information. 2-61