Hyundai Ioniq: Windshield Defrosting and Defogging / Auto Defogging System

Hyundai Ioniq (AE) 2017-2021 Owner's Manual / Convenient features of your vehicle / Windshield Defrosting and Defogging / Auto Defogging System

Hyundai Ioniq. Auto Defogging System

Auto defogging system reduces the possibility of fogging up the inside of the windshield by automatically sensing the moisture on inside the windshield.

The auto defogging system operates when the heater or air conditioning is on.

Hyundai Ioniq. Auto Defogging System

When the Auto Defogging System operates, the indicator will illuminate.

If high levels of moisture are sensed in the vehicle, the Auto Defogging System will operate in the following order:

Step 1 : Outside air position
Step 2 : Operating the air conditioning
Step 3 : Blowing air toward the windshield
Step 4 : Increasing air flow toward the windshield

If the air conditioning is off or recirculated air position is manually selected while Auto Defogging System is ON, the Auto Defogging System Indicator will blink 3 times to signal that the manual operation has been canceled.

To cancel or reset the Auto Defogging System

Press the front windshield defroster button for 3 seconds when the Engine Start/Stop button is in the ON position. When the Auto Defogging System is canceled, the ADS OFF symbol will blink 3 times and ADS OFF will be displayed on the climate control information screen.

When the Auto Defogging System is reset, the ADS OFF symbol will blink 6 times without a signal.


  • When the air conditioning is turned on by Auto defogging system, if you try to turn off the air conditioning, the indicator will blink 3 times and the air conditioning will not be turned off.
  • For efficiency, do not select recirculated air position while the Auto defogging system is operating.
  • When Auto defogging mode is selected, fan speed, temperature and intake mode which is adjusted manually are canceled for better defogging result.


Do not remove the sensor cover located on the upper end of the windshield glass.

Damage to system parts could occur and may not be covered by your vehicle warranty.

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