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 control servo motor 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 air outlet damper to any position, which controls the air outlet switching.

Tech Tips

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

DTC No. 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 control servo motor

  • Air conditioning harness

  • Air conditioning amplifier

WIRING DIAGRAM

A011AKVE39

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (AIR OUTLET SERVO PULSE (D))


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Air Conditioner / Data List.

    5. According to the display on the intelligent tester, read the Data List.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Outlet Servo Pulse (D)

      Air outlet servo motor target pulse /

      Min.: 0

      Max.: 255

      FACE: 114 (pulse)

      B/L: 89 (pulse)

      FOOT: 66 (pulse)

      FOOT/DEF: 43 (pulse)

      DEF: 18 (pulse)

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

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    A

  2. REPLACE AIR OUTLET CONTROL SERVO MOTOR


    1. Temporarily replace the air outlet control servo motor with a new one 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 one and check that the condition returns to normal.


    NEXT

  3. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Check for DTC Click here.

      OK
      DTC is not output.

    NG

    REPAIR OR REPLACE AIR CONDITIONING HARNESS Click here

    OK

    END (AIR OUTLET CONTROL SERVO MOTOR IS FAULTY)

  4. REPAIR OR REPLACE AIR CONDITIONING HARNESS


    1. Repair or replace the air conditioning harness Click here.


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Check for DTC again Click here.

      OK
      DTC is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    OK

    END