Ambient Temperature Display System [08/2020 - ]: Description

WARNING: This page is about a different variant/trim than selected.

The thermistor assembly (ambient temperature sensor) is installed in front of the cooler condenser assembly to detect the ambient temperature, which is used to control the air conditioning system 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 (ambient temperature sensor) changes in accordance with the ambient temperature. As the temperature decreases, the resistance increases. Conversely, as the temperature increases, the resistance decreases.

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

NOTE:

The thermistor assembly (ambient temperature sensor) is installed on the front of the cooler condenser assembly in the engine room and detects the ambient temperature around the installation area (the ambient temperature detected is the temperature detected around the thermistor assembly (ambient temperature sensor) and not the ambient temperature of the air surrounding the vehicle). Therefore, the ambient temperature around the thermistor assembly (ambient temperature sensor) changes depending on the radiated heat from the engine room and the ambient temperature display value is affected by vehicle speed. In the following cases, the ambient temperature of the air surrounding the vehicle and the displayed value are different and the speed at which the displayed value updates is delayed. However, this is not a malfunction.

When the vehicle is stopped or being driven at a low speed, the value is not updated to a higher temperature in order to minimize the effects of the radiated heat from the engine on the heater and air conditioning "AUTO" control. Since the same adjustment also occurs while the vehicle is being driven at medium to high speeds, updating to a higher temperature is delayed. However, the value is updated to a lower temperature regardless of the vehicle speed.
The ambient temperature around the thermistor assembly (ambient temperature sensor) installation area drastically changes due to a cause other than the radiated heat from the engine (vehicle garage, entering or exiting a tunnel, etc.).