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Repair Procedures: Inspection

Ignition "OFF"
Disconnect the connector of mode control actuator.
Verify that the mode control actuator operates to the defrost mode when connecting 12V to the terminal 3 and grounding terminal 7.
Verify that the mode control actuator operates to the vent mode when connecting in the reverse.

Fig 1: Checking Mode Control Actuator Operates To Defrost And Vent Mode
Courtesy of HYUNDAI MOTOR AMERICA

Check the voltage between terminals 4 and 5.

VOLTAGE SPECIFICATION

Door position	Voltage (4-5)	Error detecting
Max. cooling	0.3 ± 0.15V	Low voltage: 0.1V or less
Max. heating	4.7 ± 0.15V	High voltage: 4.9V or more

It will feedback current position of actuator to controls.

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