Hyundai Palisade (LX2): Heater / Auto Defogging Actuator

Hyundai Palisade (LX2) 2020-2025 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) 2020-2025 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.

Hyundai Palisade (LX2) 2020-2025 Service Manual: Troubleshooting

Diagnosis with Diagnostic tool 1. In the body electrical system, failure can be quickly diagnosed by using the vehicle diagnostic system (Diagnostic tool). The diagnostic system (Diagnostic tool) provides the following information.