2007 Chevrolet Tahoe Owner's Manual - Page 169

Outside Trailer-Tow Mirrors These mirrors can be manually folded forward or rearward. The lower portion of the mirror is convex. A convex mirror's surface is curved so you can see more from the driver's seat. The convex mirror can be adjusted manually to the driver's preferred position for better vision. Your vehicle may have outside heated mirrors which help clear them of condensation, snow, and ice. When the rear window defogger button is pressed, the heated mirrors are also turned on. Only the upper glass of the mirror is heated. The lower convex part of the mirror is not heated. If your vehicle has trailer towing type mirrors, they can be adjusted so you can have a clear view of the objects behind you. Manually pull out the mirror head to extend it for better visibility when towing a trailer. Your mirror may also have a turn signal arrow that will flash in the direction of the turn or lane change. 169