Kia Optima: Heater / Auto Defoging Actuator

Kia Optima DL3 2019-2021 Service and Repair Manual / Heating, Ventilation and Air Conditioning / Heater / Auto Defoging Actuator

Components and components location
Components Location

1. Auto logging actuator


Description and operation
Description

The auto defogging sensor is installed on 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.

Repair procedures
Inspection
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 7.

Verify that the auto defogging actuator operates to the close position when connected in reverse.

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

4.

Connect the auto defogging actuator connector.

5.

Turn the ignition switch ON.

6.

Check the voltage between terminals 4 and 5.

  

It will feedback the current position of the actuator to controls.

Specification

Door position
Voltage (V)
Error detecting
Defog ON (Open)
0.5 ± 0.15V
Low voltage : 0.7V or less
Defog OFF (Close)
4.5 ± 0.15V
High voltage : 4.9V or less

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.

Replacement
1.

Disconnect the negative (-) battery terminal.

2.

Remove the main crash pad assembly.

(Refer to Body - "Main Crash Pad Assembly")

3.

Separate the connector (A), loosen the mounting screws and remove the auto defogging actuator (B).

4.

To install, reverse the removal procedure.

Mode Control Actuator
Components and components location Components Location 1. Mode control actuator Description and operation Description The mode control actuato ...

Blower
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