Kia Optima DL3 Quiz
Heating, Ventilation, and Air Conditioning

Defog Door Actuator

In this manual: Heating, Ventilation, and Air Conditioning
General Information — 8Advanced Driver Assistance System (ADAS) — 21Maintenance — 27Engine Mechanical System — 45Engine Electrical System — 11Emission Control System — 11Engine Control System/Fuel System — 25Automatic Transmission — 20Drive Shaft and Axle — 7Suspension System — 22Steering — 7Restraints — 11Brake System — 22Body (Interior and Exterior) — 116Body Electrical System — 90Heating, Ventilation, and Air Conditioning — 32
11steps
~66min
3/5difficulty
Done 0 of 11

Components and Component Location

Component Location

1. Auto Defog Actuator

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.

Repair Procedures

Inspection

  1. Turn the ignition off.

  2. Disconnect the auto defog actuator connector.

  3. Check that the automatic anti-fog actuator operates in the open position when 12 V is applied to terminal 3 and ground is applied to terminal 7.

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

    1. -
    2. -
    3. DEF (Open)
    4. Sensor (+5V)    		 5. Feedback Signal
    6. Sensor Ground
    7. DEF (Close)

  4. Connect the defogger actuator connector.

  5. Turn the ignition on.

  6. Check the voltage between terminals 4 and 5.

    Specification

    Door Position Voltage (V) Fault Detection
    Anti-Fog ON (Open) 0.5 ± 0.15 V Low voltage: 0.7 V or less
    Anti-Fog OFF (Close) 4.5 ± 0.15 V High voltage: 4.9 V or less

  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 driver airbag module assembly.

    (See Body — "Main Airbag Assembly")

  3. Disconnect the connector (A), loosen the mounting screws, and remove the automatic anti-fog actuator (B).

  4. To install, reverse the removal procedure.

Test yourself

A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.