Without HomeLink® Universal Transceiver
WARNING: This page is about a different car, the 2007 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
Push the mode switch when the ignition switch is in the ON position. The outside temperature will be displayed in "°F". To change the indication from "°F" to "°C", push and hold the mode switch for about 5 seconds until the display begins to flash. Press the mode switch again to toggle between "°F" and "°C".