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Cabin temperature sensor

Cabin temperature sensor



The cabin temperature sensor is mounted in the dashboard below the ACC control module. It has an integral suction fan which sucks the cabin air past an NTC resistor.

Cabin temperature is the ACC control module's most important parameter. It is compared with the selected cabin temperature to determine whether the temperature of the blended air should be raised or lowered.

Cabin temperature is corrected so that it corresponds to the physical perception of the selected temperature, regardless of the outside temperature. When the difference between selected temperature and corrected cabin temperature increases, the speed of the ventilation fan will also increase.

When the ignition is switched off the suction fan will continue to run for about four minutes. This reduces the risk of incorrect temperature settings if the car is restarted within a fairly short time.

Important

The cabin temperature sensor will give an incorrect reading if the cigarette lighter or cover is not in place. This is because heated air will then be sucked through the hole for the cigarette lighter from the rear of the dashboard and into the cabin temperature sensor. The cabin temperature sensor must not be placed anywhere else in the dashboard.


If no cabin temperature reading can be obtained, a default value will be calculated on the basis of outside temperature, blended-air temperature, fan current and sunlight intensity.