DTC B1412/12: Ambient Temperature Sensor Circuit [10/2014 - ]: Description

The thermistor assembly is installed in front of the cooler condenser assembly to detect the ambient temperature. Its signal is used for air conditioning control in AUTO mode. This sensor is connected to the air conditioning amplifier assembly and detects fluctuations in the ambient temperature. This data is used for controlling the cabin temperature. The sensor sends a signal to the air conditioning amplifier assembly. The resistance of the thermistor assembly changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier assembly applies voltage (3.3 V) to the thermistor assembly and reads voltage changes due to changes in the resistance of the thermistor assembly.