Hyundai Tucson: Heater / Auto Defoging Actuator

- Description The auto defogging sensor is installed on the front window glass. The sensor judges and sends signal if moisture occurs to blow out wind for defogging. The air conditioner control module receives a signal from the sensor and restrains moisture and eliminates defog by the intake actuator, A/C, auto defogging actuator, blower motor rpm and mode actuator. - Components Location

1. Auto defogging actuator

1.Turn the ignition switch OFF.

2.Disconnect the auto defogging connector.

3.Verify that the auto defogging actuator operates to the open position when connecting 12V to terminal 3 and grounding terminal 6. Verify that the auto defogging actuator operates to the close position when connected in reverse.

1. -
2. -
3. DEF (Close)
4. DEF (Open)
5. Sensor (+ 5V)
6. Feedback signal
7. Sensoer ground

4.Connect the auto defogging actuator connector.

5.Turn the ignition switch ON.

6.Check the voltage between terminals 5 and 4.

7.If the measured voltage is not within specification, check the operation by replacing the existing auto defogging actuator with a new genuine part. After that, determine whether replacement of the auto defogging actuator is required or not.

8.Replace the auto defogging actuator if it is proved that there is a problem with it.

1.Disconnect the negative (-) battery terminal.

2.Remove the main crash pad assembly.(Refer to Body (Interior and Exterior) - "Main Crash Pad Assembly")

3.Disconenct the connector (A) and loosen the mounting screws and remove the auto defogging actuator (B).

4.Install in the reverse order of removal.