2008 GMC Sierra 1500 Pickup Owner's Manual - Page 116

Manual Folding The mirrors can be manually folded inward to prevent damage when going through an automatic car wash. To fold, push the mirror toward the vehicle. To return the mirror to its original position, push outward. Be sure to return both mirrors to their original unfolded position before driving. Convex Mirror The passenger's side mirror may have convex glass. A convex mirror's surface is curved so more can be seen from the driver's seat. {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 your right. Check your inside mirror or glance over your shoulder before changing lanes. Heated Mirrors The button to turn the heated mirrors on or off is located on the climate control panel. Press this button to warm the driver's and passenger's outside rearview mirrors to help clear them of ice, snow, and condensation. See "Rear Window Defogger" under Dual Automatic Climate Control System on page 3-26 for more information. 2-40