Cabin Temperature Sensor / Switch: Description and Operation

In-Car Temperature Sensor

The two in-car temperature sensors with aspirator blower serve for measuring the temperature in the vehicle passenger compartment.

The interior temperature is calculated by two in-car air temperature sensors in the AAC pushbutton control module:
- Temperature sensor in the AAC pushbutton control module
- Temperature sensor in the roof control unit (the measured value is conveyed to the AAC pushbutton control module via the CAN BUS)

The two in-car air temperature sensors are equipped with an aspirator blower which draws in air from the vehicle interior for the temperature measurement.
With the aspirator blower a continuous circulation of interior air at the in-car air temperature sensors is achieved, therefore guaranteeing a high control accuracy.

Sensor logic
For control of the AAC at outside temperatures < 10 °C the value of the in-car air temperature sensor (N70b1) is read into the AAC pushbutton control module (N22) and converted accordingly. At outside temperatures > 10 °C both in-car air temperature sensors (N70b1 and N22b1) are read in with the mean value of both sensors processed in the AAC pushbutton control module (N22).