Outside Temperature
Since the ambient temperature sensor is in close proximity to the radiator, it can pick up engine heat giving a false "high" outside air temperature reading - known as "Heat Soak". In order to display a more correct outside temperature, the overhead console will not increase the displayed temperature until it detects movement in the compass over a two-minute period, to insure that there is adequate airflow over the sensor. "Movement over a two minute period" is best understood as once in the first minute, then some more detected movement in the second minute.
If the display shows an open circuit OC or -49°F (-45°C) then there is an OPEN CIRCUIT or a missing sensor and the condition must be corrected. Keep in mind that after a repair is made, the vehicle may need to be driven to update the temperature for the reasons described above. Even if the engine is cool, it will not increase from -49°F without detecting movement.