Kia Niro: Heater / Auto Defogging Actuator Repair procedures

Inspection
1.

Switch "OFF" the ignition.

2.

Disconnect the auto defogging sensor connector.

3.

Connect the power (+) terminal to mode actuator connector terminal 3, and ground the negative (-) terminal to terminal 7. Then, inspect that the motor is operated in defrost mode. Reverse the connections to see that it operates in reverse.

1. -
2. -
3. DEF (Open)
4. Sensor Ref (+5V)
5. Actuator Feed back
6. Sensor Ground
7. DEF (Close)

4.

Connect the auto defogging actuator sensor connector.

5.

Switch "ON" the ignition.

6.

Check the voltage between terminals 4 and 5.

1. -
2. -
3. OPEN (CW)
4. SENSOR REF (+5V)
5. Actuator Feed back
6. Sensor Ground
7. Close (CCW)

Specification

Door position
Voltage (V)
Error detect
DEF (ON)
1.7 ± 0.15V
Low voltage : 0.6V or less
DEF (OFF)
4.7 ± 0.15V
High voltage : 4.7V or more

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

7.

If the measured voltage does not satisfy the specifications, replace with a genuine auto defogging actuator.

8.

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

Replacement
1.

Disconnect the negative (-) battery terminal.

2.

Remove the glove box housing.

(Refer to Body - "Glove Box Housing".)

3.

Loosen the mounting screw and remove the passenger seat shower duct (A).

4.

Disconnect the connector and then remove the auto defogging actuator (A) after loosening the screws.

5.

Install in the reverse order of removal.

Auto Defogging Actuator Description and operation
Description Installed on the windshield glass, the auto defogging sensor detects humidity to blow out wind for defogging to improve visibility and driver comfort. The air conditioner ...

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