Kia Rio: Heater / Mode Control Actuator

Kia Rio 2017-2023 YB Service Manual / Heating,Ventilation, Air Conditioning / Heater / Mode Control Actuator

Description and operation

Description

The mode control actuator is located at the heater unit.

It adjusts position of mode door by operating mode control actuator based on signal of A/C control unit. Pressing 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.

Verify that the mode control actuator operates to the defog mode when connecting 12V to the terminal 4 and grounding terminal 3.

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

1. -
2. -
3. Defog mode
4. Vent mode

5. Sensor ground
6. Actuator feedback signal
7. Sensor (+ 5V)

4.	Connect the mode control actuator connector.

5.	Turn the ignition switch ON.

Check the voltage between terminal 6 and 7.

Specification

With auto defogging activated

Door position	Voltage (V)	Error detecting
Vent	0.9 ± 0.3	Low voltage: 0.1V or less
Bi-Level	0.9 ± 0.3
Floor	4.1 ± 0.3
Mix	4.1 ± 0.3
Defog	4.1 ± 0.3	High voltage: 4.9V or more

With auto defogging deactivated

Door position	Voltage (V)	Error detecting
Vent	2.5 ± 0.3	Low voltage: 0.1V or less
Bi-Level	2.5 ± 0.3
Floor	4.1 ± 0.3
Mix	4.1 ± 0.3
Defog	4.1 ± 0.3	High voltage: 4.9V or more

It will feedback current position of actuator to controls.

7.	If the measured voltage is not specification, substitute with a known-good mode control actuator and check for proper operation.

8.	If the problem is corrected, replace the mode control actuator.

Replacement

1.	Disconnect the negative (-) battery terminal.

2.	Remove the BCM unit. (Refer to Body Electrical System - "Body Control Module (BCM)")

3.	Disconnect the connector (A) and then remove the mode control actuator (B) after loosening the mounting screws.

4.	Installation is the reverse order of removal.

❮Temperature Control Actuator

Description and operation Description The heater unit includes mode control actuator and temperature control actuator. The temperature control actuator is located at the heater unit.

PTC Heater❯

Description and operation Description The PTC (Positive Temperature Coefficient) heater is installed at the exit or the backside of heater core.

Other information:

Kia Rio 2017-2023 YB Service Manual: Ambient Temperature Sensor

Description and operation Description The ambient temperature sensor is located at the front of the condenser and detects ambient air temperature. It is a negative type thermistor; resistance will increase with lower temperature, and decrease with higher temperature.

Kia Rio 2017-2023 YB Service Manual: Intake Actuator