Kia Rio: Ambient Temperature Sensor / Auto Defogging Sensor (FATC only)

Kia Rio 2017-2022 YB Service Manual / Heating,Ventilation, Air Conditioning / Ambient Temperature Sensor / Auto Defogging Sensor (FATC only)

Description and operation

The Auto Defogging Sensor is installed on front windshild glass. The Auto Defogging Sensor senses moisture on the windshild. The air conditioner control module receives the signal from the sensor and eliminate the fog by controlling the intake actuator, A/C, auto defogging actuator, blower motor rpm, and mode actuator.

Repair procedures

Press the MODE switch more then 4 times within 2 seconds while pressing the OFF switch.

Fail description
Auto defogging sensor communication and sensor input fault

* For diagnostic procedure, refer to DTC guide.


Remove the auto defogging sensor cover (A).


Disconnect the connector (B) and then remove the auto defogging sensor (C).


Installation is the reverse order of removal.

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