AIR CONDITIONING SYSTEM (for Manual Air Conditioning System), Diagnostic DTC:B1443

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

DESCRIPTION

The damper servo sub-assembly (mode damper servo) 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 may be stored when either a damper link or damper is mechanically locked.

DTC Code DTC Detection Condition Trouble Area
B1443 The air outlet damper position does not change when the air conditioning amplifier assembly operates the damper servo sub-assembly (mode damper servo).

  • Damper servo sub-assembly (mode damper servo)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01DR90E52

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

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

    B

    READ VALUE USING INTELLIGENT TESTER (MODE DAMPER SERVO) Click here

    C

    GO TO B1497 Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  2. READ VALUE USING INTELLIGENT TESTER (MODE DAMPER SERVO)


    1. Use the Data List to check if the damper servo sub-assembly (mode damper servo) is functioning properly Click here.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Outlet Servo Pulse (D) Damper servo sub-assembly (mode damper servo) actual pulse / Min.: 0, Max.: 255

      15 (pulse): FACE

      41 (pulse): B/L

      65 or 73 (pulse): FOOT

      83 or 95 (pulse): F/D

      113 (pulse): DEF

      		 -
      Air Outlet Servo Actu Pulse (D) Damper servo sub-assembly (mode damper servo) actual pulse / Min.: 0, Max.: 255

      15 (pulse): FACE

      41 (pulse): B/L

      65 or 73 (pulse): FOOT

      83 or 95 (pulse): F/D

      113 (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
      Both target pulse and actual pulse do not display C
      Target pulse displays normally, but actual pulse does not display D

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    D

    CHECK DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO) Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1443 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. CHECK DAMPER SERVO SUB-ASSEMBLY (MODE DAMPER SERVO)


    1. Replace the damper servo sub-assembly (mode damper servo) Click here.

      Tech Tips

      Since the damper servo sub-assembly (mode damper servo) cannot be inspected while it is removed from the vehicle, replace the damper servo sub-assembly (mode damper servo) with a new or normally functioning one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1443 is not output.

    NG

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    OK

    END (DAMPER SERVO SUB-ASSEMBLY [MODE DAMPER SERVO] IS FAULTY)

  5. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Temporarily replace the air conditioning harness assembly with a new or normally functioning one Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1443 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)