Kia Optima: Heater / Mode Control Actuator

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

Components and components location
Components Location

1. Mode control actuator

Description and operation
Description

The mode control actuator is located at the heater unit.

It adjusts the position of the mode door by operating the mode control actuator based on the signal of the A/C control unit. Pressing the mode select switch makes the mode control actuator shift in order of Vent → Bi-Level → Floor → Mix.

Repair procedures
Inspection
1.

Turn the ignition switch OFF.

2.

Disconnect the mode control actuator connector.

3.

Verify that the mode control actuator operates to the defrost mode when connecting 12V to terminal 3 and grounding terminal 7.

Verify that the mode control actuator operates to the vent mode when connected in reverse.

1. -
2. -
3. Defrost mode
4. Sensor ground
5. Feedback signal
6. Sensor power (+ 5V)
7. Vent mode

4.

Connect the mode control actuator connector.

5.

Turn the ignition switch ON.

6.

Check the voltage between terminal 6 and 5.

  

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

Specification

Door position
Voltage (V)
Error detecting
Vent
0.5 ± 0.15V
Low voltage : 0.1V or less
Defrost
4.5 ± 0.15V
High voltage : 4.9V or more

7.

If the measured voltage is not within specification, check the operation by replacing the existing mode control actuator with a new genuine part. After that, determine whether replacement of the mode control 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 mode control actuator (B).

4.

To install, reverse the removal procedure.

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