1998 Toyota 4Runner Owners Manual - Page 102

4RUNNER (1998) -Power Rear view mirror control Adjust the mirror so you can see the side of your vehicle in the mirror. Be careful when judging the size or distance of any object seen in the outside rear view mirror on the passenger's side. It is a convex mirror with a curved surface. Any object seen in a convex mirror will look smaller and farther away than when seen in a flat mirror. CAUTION Do not adjust the mirror while the vehicle is moving. It may cause the driver to mishandle the vehicle and an accident may occur resulting in personal injuries.