2010 GMC Savana 2500 Cargo Owner's Manual - Page 145

Outside Power Mirrors Vehicles with outside power mirrors have controls located on the driver side door. Outside Convex Mirror { WARNING: 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. Select each mirror by turning the knob clockwise for the passenger side mirror or counterclockwise for the driver side mirror. The center position is neutral. Then, adjust the mirror angle by moving the knob in the desired direction. The auxiliary convex mirrors can only be adjusted manually. The passenger side mirror is convex shaped. A convex mirror's surface is curved so more can be seen from the driver seat. 3-41