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 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.

Tip:

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 control servo motor.

  • Air outlet control servo motor

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

E354481E03

PROCEDURE

  1. CHECK FOR DTC

    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      Table 1. 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

    USE SIMULATION METHOD TO CHECK

    (Click here)

    GO TO DTC B1497/97

    (Click here)

  2. READ VALUE USING INTELLIGENT TESTER

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

      Table 2. Air Conditioner

      Tester Display

      Measurement Item/Range

      Normal Condition

      Diagnostic Note

      Air Outlet Servo Pulse (D)

      Air outlet control servo motor target pulse / Min.: 0, Max.: 255

      47 (pulse): FACE

      37 (pulse): B/L

      18 (pulse): FOOT

      9 (pulse): F/D

      5 (pulse): DEF

      -

      Air Outlet Servo Actu Pulse (D)

      Air outlet control servo motor actual pulse / Min.: 0, Max.: 255

      47 (pulse): FACE

      37 (pulse): B/L

      18 (pulse): FOOT

      9 (pulse): F/D

      5 (pulse): DEF

      -

      OK

      The display is as specified in the normal condition column.

      Table 3. 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

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    (Click here)

    CHECK AIR OUTLET CONTROL SERVO MOTORClick here

  3. CHECK FOR DTC

    1. Clear the DTCs (Click here).

    2. Check for DTCs (Click here).

      OK

      DTC B1443 is not output.

    USE SIMULATION METHOD TO CHECK

    (Click here)

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    (Click here)

  4. CHECK AIR OUTLET CONTROL SERVO MOTOR

    1. Replace the air outlet control servo motor (Click here).

      Tip:

      Since the air outlet control servo motor cannot be inspected while it is removed from the vehicle, replace the air outlet control servo motor 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.

    END (AIR OUTLET CONTROL SERVO MOTOR 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.

    END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    (Click here)