Hyundai Sonata: Heater / Mode Control Actuator Repair procedures

Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the mode control actuator connector.
3.
Verify that the mode control actuator operates to the defrost 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.

1. -
2. -
3. Defrost mode
4. sensor ground
5. Feedback signal
6. Sensor (+ 5V)
7. Vent mode

4.
Connect the mode control actuator connector.
5.
Turn the ignition switch ON.
6.
Check the voltage between terminal 6 and 5.
Specification
Door position
Voltage (V)
Error detecting
Vent
1
Low voltage : 0.1V or less
Defrost
4.4
High voltage : 4.9V or more

It will feedback the current position of the actuator to controls.
7.
If the measured voltage is not within specification, substitute with a known-good mode control actuator and check for proper operation.
8.
Replace the mode control actuator if it is proved that there is a problem with it.
Diagnosis With GDS
1.
The heating, ventilation and air conditioning can be quickly diagnosed failed parts with vehicle diagnostic system (GDS).
? The diagnostic system (GDS) provides the following information.
(1) Self diagnosis: Checking the failure code (DTC) and display.
(2) Current data: Checking the system input/output data state.
(3) Actuation test: Checking the system operation condition.
(4) Additional function: Other controlling such as he system option and zero point adjustment.
2.
Select the 'Car model' and the system to be checked in order to check the vehicle with the tester.
3.
Select the 'Current data' menu to search the current state of the input/output data.
The input/output data for the sensors corresponding to the Mode Control Actuator can be checked.

4.
To perform compulsory operation on Mode Control Actuator input factors, select "ACTUATION TEST".

Replacement
1.
Disconnect the negative (-) battery terminal.
2.
Remove the crash pad lower panel.
(Refer to Body - "Crash Pad Lower Panel")
3.
Down the steering column after loosening the mounting bolts.
(Refer to Steering System - "Steering Column and Shaft")
4.
Remove the driver's side shower duct (A) after loosening the screw.

5.
Disconnect the connector (A) and then remove the mode control actuator (B) after loosening the mounting screws.

6.
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. ...

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