In-Vehicle Temperature Sensor
WARNING: This page is about a different car, the 2018 Land Rover Discovery and 2017 Land Rover Discovery. However, it is still accessible from the selected car via links, so may be relevant.
The in-vehicle temperature sensor is a Negative Temperature Coefficient (NTC) thermistor. The sensor is installed behind a grill in the instrument panel, on the inboard side of the steering column. A motor driven fan in the sensor draws air through the grill and over the thermistor.
The Automatic Temperature Control Module (ATCM) supplies the in-vehicle temperature sensor with a 5V reference voltage and translates the return signal voltage into a temperature. If the in-vehicle temperature sensor develops a fault, the ATCM adopts a default temperature of 20 °C (68 °F).
The ATCM uses the signal from the in-vehicle temperature sensor for control of the climate control assembly output temperatures, blower speed and air distribution.
NOTE:
This component is not fitted to the 2 Zone manual system.