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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 120 (Air Conditioning System Diagnosis (HEV)) >> DTC B1249: Direction Potentiometer Open (Low) Driver >> Component Inspection >> Component Inspection

Component Inspection

WARNING: This page is about a different variant/trim than selected.

■ Check Driver Direction Actuator 

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

    Specification  : (Refer the Specifications in Fig.1)

    Fig 1: Driver Direction Actuator Operation To DEF Position
    G10591112Courtesy of HYUNDAI MOTOR AMERICA
    Actuator Harness DEF (+) VENT (-) Door Position
    Battery Terminal 12 V ground DEF. Mode
    ground 12 V VENT. Mode

    (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 

    NO 

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

■ Check Potentiometer 

  1. Ignition "OFF"
  2. Connect Driver Direction actuator and A/C Control Unit main harness connector.
  3. Ignition "ON"
  4. Measure voltage between Signal (F/B) terminal of Driver Direction 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 Driver Direction Actuator Harness Connector And A/C-ECU Harness Connector
    G10591113Courtesy of HYUNDAI MOTOR AMERICA
    Mode Door Position Voltage
    VENT 0.3 ± 0.15V
    BI-LEVEL 1.4 ± 0.4V
    FLOOR 2.5 ± 0.4V
    MIX 3.6 ± 0.4V
    DEF 4.7 ± 0.15V

    (Fig.2) * Voltage value of Direction potentiometer 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 Driver Direction actuator and check for proper operation. If the problem is corrected, replace Driver Direction actuator and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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