2008 Toyota Tundra Owners Manual - Page 442

07 11.20 XS10006 XS10007a The compass sensor is in the inside rear view mirror. CALIBRATING THE COMPASS (deviation calibration) The direction display on the compass deviates from the true direction determined by the earth's magnetic field. The angle of deviation varies according to the geographic position of the vehicle. To adjust this deviation, stop the vehicle, then push and hold the " " switch until the zone number appears on the display. Then push the " " switch, referring to NOTICE Do not put magnets or a metal object on or near the inside rear view mirror of the vehicle. Doing this may cause malfunction of the compass sensor. the following map to select the number of the zone where the vehicle is. 412 2008 TUNDRA from Apr. '08 Prod. (OM34477U)