Outside Air Temperature Indicator Calibration: Procedure
How to use this service information .
NOTICE:
When working with a vehicle equipped with the electronic air suspension, be sure to set it to the leveling off mode to prevent unexpected operation. Refer to the Electronic Air Suspension System Service Precautions - Refer to: Electronic Air Suspension System Connector Fitting Precautions or Electronic Air Suspension System Service Precautions for the procedure.
- Outside Air Temperature Indicator - CalibrateNOTE:
To test the outside air temperature sensor, refer to the outside air temperature sensor test procedure .
Description
The outside air temperature sensor is located behind the right corner of the front upper beam. The gauge control module uses measurements from this sensor to display the outside air temperature.
Because of the location of the sensor, it may be affected by heat reflection from the road, engine and radiator heat, or hot exhaust from the surrounding traffic.
These conditions can heat soak the outside air temperature sensor and cause inaccurate readings. Logic has been written into the gauge control module to help prevent abnormal or fluctuating outside air temperature indicator readings.
Outside Air Temperature Indicator Logic
Engine coolant temperature 140 deg.F (60 deg.C) or higher: If the engine coolant temperature is 140 deg.F (60 deg.C) or higher when the vehicle is turned ON mode, the outside air temperature shown the last time the key was turned off is displayed regardless of the current temperature measured by the outside air temperature sensor.
Engine coolant temperature less than 140 deg.F (60 deg.C): If the engine coolant temperature is less than 140 deg.F (60 deg.C) or lower when the vehicle is turned ON mode, the current temperature measured by the outside air temperature sensor is indicated.
Information Update to the Outside Air Temperature Indicator While Driving
Engine coolant temperature 140 deg.F (60 deg.C) or higher: If the temperature measured by the outside air temperature sensor is greater than the temperature on the outside air temperature indicator, the outside temperature indicator will increase by 1 deg.F (1 deg.C) per minute after the vehicle speed is greater than 30 km/h (19 mph) for more than 1 minute and 30 seconds. It continues to increase until the current outside air temperature is indicated. So, the first change to the outside air temperature indicator is 1 minute and 30 seconds after the vehicle speed exceeds 19 mph (30 km/h). If the vehicle speed drops below 19 mph (30 km/h), the indicator does not update again until the vehicle speed has increased to 19 mph (30 km/h) or more for more than 1 minute and 30 seconds again.
Engine coolant temperature less than 140 deg.F (60 deg.C): If the outside air temperature is less than the indicated temperature, the temperature decreases by 1 deg.F (1 deg.C) every 2 seconds until the current outside air temperature is indicated regardless of vehicle speed.
Troubleshooting
If the indicator displays - - - deg.F (- - - deg.C) for more than 2 seconds after selecting the outside air temperature display mode, the gauge is not receiving the outside temperature data from the climate control unit over the B-CAN. Check the climate control system or multiplex integrated control system for DTCs. (Figure 1 and 2)
Fahrenheit: (Figure 1)
Celsius: (Figure 2)
Calibration
NOTE:- The outside air temperature indicator's displayed temperature can be recalibrated +/-3 deg.C (+/-5 deg.F) to meet the client's expectations.
- The outside air temperature can be calibrated by using the center display unit.
1. Turn the vehicle to the ON mode.
2. Select the HOME button.
3. Select the following icons in sequence.
- Settings
- Vehicle
- Meter Setup
- Adjust Outside Temp Display
4. When the desired correction value appears on the display, release the button, and the recalibrated outside air temperature will be displayed.
NOTE: The recalibration temperature is not the value the sensor sees. Therefore the temperature can only be adjusted +/-5 deg.F (+/-3 deg.C).Example:
Incorrect value
=
68 deg.F (20 deg.C)
Desired correction value
=
+2 deg.F (+1 deg.C)
Correct value
=
70 deg.F (21 deg.C)
Desired correction value
=
-2 deg.F (-1 deg.C)
Correct value
=
66 deg.F (19 deg.C)
NOTE:To recalibrate the display to the true temperature, remove the sensor (A), but leave it connected. Submerge the sensor and a thermometer (B) in a container of ice water (C). Select the calibration mode as described above, then recalibrate the display to the true temperature. (Figure 3)
Figure 3
5. The snow mark is displayed when the temperature is 37 deg.F (3 deg.C) or less the first time you press the engine start/stop button to select the ON mode. (Figure 4)
Figure 4