Repair Procedures: Inspection

WARNING: This page is about a different car, the 2016 Hyundai Elantra GT and 2015 Hyundai Elantra GT. However, it is still accessible from the selected car via links, so may be relevant.

Turn the ignition switch OFF.
Disconnect the mode control actuator connector.
Verify that the mode control actuator operates to the defog mode when connecting 12V to terminal 3 and grounding terminal 4.
Verify that the mode control actuator operates to the vent mode when connected in reverse.

Fig 1: Identifying Mode Control Actuator Connector
Courtesy of HYUNDAI MOTOR AMERICA
Connect the mode control actuator connector.
Turn the ignition switch ON.

Check the voltage between terminal 4 and 5.

Specification

VOLTAGE SPECIFICATION

Door Position	Voltage (V)	Error Detecting
Vent	0.3	Low voltage: 0.1V or less
Bi-Level	1.77
Floor	3.23
Mix	3.97
Defog	4.7	High voltage: 4.9V or more

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

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