Kia Forte BD Quiz
Heating, Ventilation, and Air Conditioning

Defog Door Actuator

In this manual: Heating, Ventilation, and Air Conditioning
General Information — 8Maintenance — 32Engine Mechanical System — 47Engine Electrical System — 17Emission Control System — 10Engine Control System/Fuel System — 32Clutch System — 11Manual Transmission — 11DCT (Dual Clutch Transmission) System — 16Drive Shaft and Axle — 8Suspension System — 26Steering — 9Restraints — 11Brake System — 27Body (Interior and Exterior) — 119Body Electrical System — 98Heating, Ventilation, and Air Conditioning — 27
11steps
~66min
3/5difficulty
Done 0 of 11

Description and Operation

Description

The automatic defog sensor is installed on the windshield. The sensor detects and sends a signal when moisture appears, so that air is blown to prevent fogging. The air conditioning control module receives the signal from the sensor and controls moisture removal and defog protection through the intake actuator, air conditioning, automatic defog actuator, blower motor speed, and mode actuator.

Specifications

Specifications

Door Position Voltage (V) Fault Detection
Max. Cool 0,3 ± 0,15 Low voltage: 0.1 V or less
Max. Heat 4,7 ± 0,15 High voltage: 4.9 V or more

Repair Procedures

Inspection

  1. Turn the ignition off.

  2. Disconnect the auto defog actuator connector.

  3. Check that the automatic defog actuator operates in the open position when 12 V is applied to terminal 3 and terminal 4 is grounded.

    Check that the automatic defog actuator operates in the closed position when the connections are reversed.

    Pin No. Function
    1 -
    2 -
    3 Open
    4 Sensor (+5V)
    5 Feedback Signal
    6 Sensor Ground
    7 Off

  4. Connect the defogger actuator connector.

  5. Turn the ignition on.

  6. Check the voltage between terminals 6 and 5.

  7. If the measured voltage does not meet the specification, check operation by replacing the existing automatic defog actuator with a new genuine part. Then determine whether the automatic defog actuator needs to be replaced.

Replacement

  1. Disconnect the negative (-) battery terminal.

  2. Remove the intake actuator.

    (Refer to Heater - "Intake Actuator")

  3. Disconnect the connector (B), then remove the automatic anti-fog actuator (A) after loosening the mounting screws.

  4. To install, reverse the removal procedure.

Test yourself

A quick Kia Forte BD quiz: every answer comes with an explanation and a link to the manual page.