AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1443/43

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

DESCRIPTION

The air outlet damper servo sub-assembly sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal or reverse) based on the signals to move the air outlet damper to any position, which controls the air outlet changes.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area
B1443/43 The air outlet damper position does not change even if the air conditioning amplifier assembly operates the air outlet damper servo motor.

  • Air outlet damper servo sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A0052FHE07

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 DAMPER SERVO)


    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
      Air Outlet Servo Pulse (D)

      Air outlet damper servo /

      5: Min., 47: Max.

      47 (pulse): FACE

      37 (pulse): B/L

      18 (pulse): FOOT (M)

      18 (pulse): FOOT (A)

      9 (pulse): F/D

      5 (pulse): DEF

      		 -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      OK (When troubleshooting according to the DTC) A
      OK (When troubleshooting according to Problem Symptoms Table) B
      NG C

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  3. CHECK AIR OUTLET DAMPER SERVO SUB-ASSEMBLY


    1. Replace the air outlet damper servo sub-assembly Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or normally functioning one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1443/43 is not output A
      DTC B1443/43 is output B

    A

    END (AIR OUTLET DAMPER SERVO SUB-ASSEMBLY IS DEFECTIVE)

    B

  4. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly Click here.

      Tech Tips

      Since the air conditioning harness assembly cannot be inspected while it is removed from the vehicle, replace the air conditioning harness assembly with a new or normally functioning one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1443/43 is not output A
      DTC B1443/43 is output B

    A

    END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here