AIR CONDITIONING SYSTEM, Diagnostic DTC:B1443/43

DTC Code DTC Name
B1443/43 Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The mode damper servo (for driver side FACE) sends pulse signals to inform the air conditioning amplifier of the damper position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the mode damper servo (for driver side FACE) to any position, which controls the air outlet changes.

Tech Tips

Confirm that no mechanical problem is present because this diagnostic code can be output when either a damper link or damper is mechanically locked.

DTC Code DTC Detection Condition Trouble Area
B1443/43 Air outlet damper position sensor value does not change even if air conditioning amplifier operates air outlet servo motor

  • Air outlet servo motor (for driver side FACE)

  • Air conditioning harness

  • Air conditioning amplifier

WIRING DIAGRAM

A000VTJE93

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1443/43 is not output A
      DTC B1443/43 is output B
      DTC B1443/43 and B1497/97 are output C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO DTC B1497/97 Click here

    B

  2. READ VALUE USING INTELLIGENT TESTER (AIR OUTLET SERVO MOTOR TARGET PULSE (for Driver Side FACE))


    1. Use the Data List to check if the servo motor is functioning properly.

      Air conditioner
      Tester Display Measurement Item / Range Normal Condition Diagnostic Note
      A/O Damper FACE Pos(D)

      Driver side FACE air outlet servo motor target pulse /

      for LHD Min.: 7, Max.: 126

      for RHD Min.: 32, Max.: 151

      for LHD:


      • Shut: 7 (pulse)

      • Open: 126 (pulse)

      for RHD:


      • Shut: 151 (pulse)

      • Open: 32 (pulse)

      		 -
      OK
      The display is as specified in the normal condition.

    2. Visually inspect the air outlet servo motor (for driver side FACE).


      1. Visually inspect whether the air outlet servo motor (for driver side FACE) operates.

        OK
        The air outlet servo motor (for driver side FACE) operates.
        Result
        Result Proceed to
        The Data List value changes and the air outlet servo motor (for driver side FACE) operates (When troubleshooting according to the DTC output) A
        The Data List value changes and the air outlet servo motor (for driver side FACE) operates (When troubleshooting according to Problem Symptoms Table) B
        The Data List value does not change and the air outlet servo motor (for driver side FACE) does not operate C
        The Data List value changes, but the air outlet servo motor (for driver side FACE) does not operate D

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    D

    CHECK AIR OUTLET SERVO MOTOR (for Driver Side FACE) Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1443/43 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

  4. CHECK AIR OUTLET SERVO MOTOR (for Driver Side FACE)


    1. Replace the air outlet servo motor Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1443/43 is not output.

    OK

    END (AIR OUTLET SERVO MOTOR (for Driver Side FACE) IS FAULTY)

    NG

  5. CHECK AIR CONDITIONING HARNESS


    1. Replace the air conditioning harness Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1443/43 is not output.

    OK

    END (AIR CONDITIONING HARNESS IS FAULTY)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here