Hyundai Palisade (LX2): Heater / Auto Defogging Actuator

Hyundai Palisade (LX2) 2020-2026 Service Manual / Heating,Ventilation And Air Conditioning / Heater / Auto Defogging Actuator

Description and operation

Description

The auto defogging sensor is installed on the front window glass. The sensor judges and sends signal if moisture occurs to blow out wind for defogging. The air conditioner control module receives a signal from the sensor and restrains moisture and eliminates defog by the intake actuator, A/C, auto defogging actuator, blower motor rpm and mode actuator.

Components and components location

Components Location

Hyundai Palisade. Components and components location

1. Auto defogging actuator

Repair procedures

Inspection

1.	Turn the ignition switch OFF.

2.	Disconnect the auto defogging connector.

Verify that the auto defogging actuator operates to the open position when connecting 12V to terminal 3 and grounding terminal 6.

Verify that the auto defogging actuator operates to the close position when connected in reverse.

Hyundai Palisade. Repair procedures

1. -
2. -
3. DEF (Close)
4. DEF (Open)

5. Sensor power (+5V)
6. Feedback signal
7. Sensor ground

4.	Connect the auto defogging actuator connector.

5.	Turn the ignition switch ON.

Check the voltage between terminals 5 and 4.

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

Specification

Door position	Voltage (V)	Error detecting
Defog ON (Open)	0.5 ± 0.15	Low voltage : 0.7V or less
Defog OFF (Close)	4.7 ± 0.15	High voltage : 4.9V or less

7.	If the measured voltage is not within specification, check the operation by replacing the existing auto defogging actuator with a new genuine part. After that, determine whether replacement of the auto defogging 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.	Press the lock pin and separate the connector (A) and loosen the mounting screws and remove the auto defogging actuator (B).

4.	Install in the reverse order of removal.

❮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.

Blower❯

Other information:

Hyundai Palisade (LX2) 2020-2026 Service Manual: A/C Pressure Transducer

Description and operation Description The A/C Pressure Transducer (APT) converts the pressure value of high pressure line into voltage value after measuring it. By converted voltage value, engine ECU controls the cooling fan by operating it high speed or low speed.

Hyundai Palisade (LX2) 2020-2026 Service Manual: Cluster Ionizer

Description and operation Description The cluster ionizer makes disinfection and decomposition of bad smell from the air-conditioner or inflow air. And it cleans the inside air of a vehicle. When the ignition switch is ON, the ionizer runs "CLEAN" mode and then "ION" mode, switching between both modes.