DTC B1419/19: Rear Room Temperature Sensor Circuit: Description

The rear room temperature sensor is installed in the rear panel to detect the rear room temperature and control the heater and air conditioning AUTO mode. The resistance of the rear room temperature sensor changes in accordance with the rear room temperature. As the temperature decreases, the resistance increases. As the temperature increases, the resistance decreases.

The air conditioning amplifier applies a voltage (5 V) to the rear room temperature sensor and reads voltage changes as changes in the resistance of the rear room temperature sensor.