Humidity Control

WARNING: This page is about a different car, the 2021 Jaguar I-Pace, 2020 Jaguar I-Pace, and 2019 Jaguar I-Pace. However, it is still accessible from the selected car via links, so may be relevant.

The HVAC control module uses the signals from the humidity sensor to control the humidity in the passenger compartment. The HVAC used the humidity sensor data to do the following:

Adjusts the humidity of the air in the vehicle as necessary, to provide the optimum comfort level for occupants.
Calculates the dew point temperature of the air at the inside of the windshield.

Humidity within the vehicle is controlled by raising or lowering the temperature of the Air Conditioning (A/C) evaporator. An increase in A/C evaporator temperature increases the moisture content of the air at the windshield. Lowering the A/C evaporator temperature reduces the moisture content of the air in the passenger compartment.

If the dew point of the air within the passenger compartment rises to be close to that of the windshield, temperature misting is likely to occur.

To prevent this, the HVAC does the following:

Increase the blower speed.
Reduce the A/C evaporator operating temperature to its lowest safe running temperature.
Increase the temperature of the air leaving the climate control assembly.
Adjust the position of the demist distribution motor to direct more air to the windshield.
Adjust the position of the recirculation motor to admit more fresh air.
Send a message to the Body Control Module/Gateway Module (BCM/GWM) through the High Speed (HS)
Controller Area Network (CAN) Human Machine Interface (HMI) systems bus, to energize the heated windshield (if equipped).
- For additional information, Refer to: GLASS, FRAMES AND MECHANISMS .