Hyundai Elantra: Heater / Auto Defoging Actuator

Hyundai Elantra (CN7) 2021-2025 Service Manual / Heating, Ventilation and Air Conditioning / Heater / Auto Defoging Actuator

Description and operation

Description

The auto defogging sensor is installed on 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

1. Auto defoging actuator

Specifications

Door position	Voltage (V)	Error detecting
Max. cooling	0.3 ± 0.15	Low voltage : 0.1V or less
Max. heating	4.7 ± 0.15	High voltage : 4.9V or more

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 7.

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

Pin No	Function
1	-
2	-
3	Open
4	Sensor (+5V)
5	Feedback signal
6	Sensor ground
7	Off

4.	Connect the auto defogging actuator connector.

5.	Turn the ignition switch ON.

6.	Check the voltage between terminals 6 and 5.

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 (Interior and Exterior) - "Main Crash Pad Assembly")

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

4.	To install, reverse the removal procedure.

Mode Control Actuator

Description and operation DescriptionThe 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:

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Function malfunction and limitations

Function malfunction

When High Beam Assist is not working properly, the ‘Check High Beam Assist (HBA) system’ or ‘Check HBA (High Beam Assist) system’ warning message will appear and warning light will illuminate on the cluster. Take your vehicle to an authorized HYUNDAI dealer and have the function checked.