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 indicate the damper position to the A/C amplifier. The A/C amplifier activates the motor (normal or reverse) based on these signals to move the mode damper to any position, which controls the air outlet switching.

The A/C amplifier communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness.

DTC No. DTC Detection Condition Trouble Area
B1443/43 Air outlet damper position sensor value does not change even if A/C amplifier operates air outlet control servo motor

  • Air outlet control servo motor

  • Air conditioning harness

  • A/C amplifier

WIRING DIAGRAM

A01EJNDE07

INSPECTION PROCEDURE

Tech Tips

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

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Operate the MODE switch.

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

    6. Check the value(s) by referring to the table below.

      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

      FACE: 8 (pulse)

      B/L: 30 to 38 (pulse)

      FOOT: 50 to 74 (pulse)

      FOOT/DEF: 80 (pulse)

      DEF: 97 (pulse)

      		 -
      Air Outlet Servo Actu Pulse (D) Air outlet control servo motor actual pulse / Min.: 0, Max.: 255

      FACE: 8 (pulse)

      B/L: 30 to 38 (pulse)

      FOOT: 50 to 74 (pulse)

      FOOT/DEF: 80 (pulse)

      DEF: 97 (pulse)

      		 -
      OK
      When the MODE switch is operated, the actual pulse changes following the target pulse.
      Result
      Result Proceed to
      Target pulse changes but actual pulse dose not change A
      Target pulse and actual pulse do not change B
      Actual pulse changes following the target pulse (When troubleshooting according to the DTC) C
      Actual pulse changes following the target pulse (When troubleshooting according to the DTC) D

    B

    REPLACE AIR OUTLET CONTROL SERVO MOTOR Click here

    C

    RECHECK FOR DTCs Click here

    D

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

    A

    REPLACE A/C AMPLIFIER Click here

  2. REPLACE AIR OUTLET CONTROL SERVO MOTOR


    1. Replace the air outlet control 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 new or known good one and check that the condition returns to normal.

    2. Check for DTCs.

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

    B

    END (AIR OUTLET CONTROL SERVO MOTOR WAS DEFECTIVE)

    A

  3. REPLACE AIR CONDITIONING HARNESS


    1. Replace the air conditioning harness Click here.

      Tech Tips

      Since the air conditioning harness cannot be inspected while it is removed from the vehicle, replace the air conditioning harness with a new or known good one and check that the condition returns to normal.

    2. Check for DTCs.

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

    B

    END (AIR CONDITIONING HARNESS WAS DEFECTIVE)

    A

    REPLACE A/C AMPLIFIER Click here

  4. RECHECK FOR DTCs


    1. Clear the DTCs.

    2. Check for DTCs.

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

    B

    USE SIMULATION METHOD TO CHECK Click here

    A

    REPLACE A/C AMPLIFIER Click here