2009 Toyota Tundra Owners Manual - Page 456

3-7. Other interior features n When - -° C or - -° F is displayed The system may be malfunctioning. Take your vehicle to your Toyota dealer. n The outside air temperature is displayed when The engine switch is in the ON position. n When disconnecting and reconnecting battery terminals The display will automatically be set to the initial mode. n Display In the following situations, the correct outside temperature may not be displayed, or the display may take longer than normal to change. l When stopped, or driving at low speeds (less than 12 mph [20 km/h]) l When the outside temperature has changed suddenly (at the entrance/ exit of a garage, tunnel, etc.) 428