Component Inspection

■ Check Auto Defog Actuator 

1. Ignition "OFF"
2. Disconnect Auto Defog actuator and connect A/C control unit main harness connector.
3. Connect (+) terminal of battery to OPEN (+) of Auto Defog actuator and (-) terminal to CLOSE (-) (Component Side).
4. Verify that the Auto Defog actuator operates to the OPEN position.
5. Verify that the Auto Defog actuator operates to the CLOSE position with reverse connecting (CLOSE (+) and OPEN (-)) (Component Side).

   Specification  : (Refer the Specifications in Fig.1)

   Fig 1: Verifying Auto Defog Actuator Operation To Open Position

   Courtesy of HYUNDAI MOTOR AMERICA

   Actuator Harness	OPEN (+)	CLOSE (-)	Door Position
   Battery Terminal	12 V	ground	OPEN
   	ground	12 V	CLOSE

   (Fig.1) * Function of the actuator motor according to terminal connection type (Observe Safety Regulations).

6. Is "Door Position" display near the specified value?

   YES 

   • Go to "CHECK POTENTIOMETER " procedure.

   NO 

   • Substitute with a known-good Auto Defog actuator and check for proper operation. If the problem is corrected, replace Auto Defog actuator and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

■ Check Potentiometer 

1. Ignition "OFF"
2. Connect Auto Defog actuator and A/C control unit main harness connector.
3. Ignition "ON"
4. Measure voltage between Signal (F/B) terminal of Auto Defog actuator harness connector and Sensor ground (-) terminal of A/C-ECU harness connector (Component Side).

   Specification  : (Refer the Specifications in Fig.2)

   Fig 2: Measuring Voltage Between Auto Defog Actuator Harness Connector And A/CECU Harness Connector

   Courtesy of HYUNDAI MOTOR AMERICA

   Door Position	Voltage
   CLOSE (VENT, B/L)	About 3.76V
   FLOOR	About 3.1V
   MIX	About 2.23V
   OPEN (DEF) About	0.64V

   (Fig.2) * Voltage value of Auto Defog actuator as a function of position of mode switch.

5. Is "Voltage" display near the specified value?

   YES 

   • Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.

   NO 

   • Substitute with a known-good Auto Defog actuator and check for proper operation. If the problem is corrected, replace Auto Defog actuator and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.