AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1457/57

DTC Code DTC Name
B1457/57 Driver Side Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The front air mix damper servo motor (for driver side rear air flow) 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 front air mix damper (for driver side rear air flow) to any position. As a result, the amount of air that has passed through the evaporator and is passing through the heater core is adjusted, and the temperature of the air blowing toward the rear driver side is controlled.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area
B1457/57 The air mix damper position does not change even if the air conditioning amplifier assembly operates the front air mix damper servo motor.

  • Front air mix damper servo motor (for driver side rear air flow)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01X3RBE14
A01X3RBE15

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (FRONT AIR MIX DAMPER SERVO MOTOR)


    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 Mix Servo Targ Pls(F&R D)

      Front air mix damper servo motor (for driver side rear air flow) target pulse /

      Min.: 13, Max.: 41 (for LHD)

      Min.: 5, Max.: 33 (for RHD)

      for LHD


      • MAX COOL: 13 (pulse)

      • MAX HOT: 41 (pulse)

      for RHD


      • MAX COOL: 33 (pulse)

      • MAX HOT: 5 (pulse)

      		 -
      OK
      The display is as specified in the normal condition.
      Result
      Result Proceed to
      OK (Checking from the DTC) A
      OK (Checking from the PROBLEM SYMPTOMS TABLE) B
      NG C

    B

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

    C

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

  2. CHECK FRONT AIR MIX DAMPER SERVO MOTOR


    1. Replace the front air mix damper servo motor (for driver side rear air flow).


      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1457/57 is not output A
      DTC B1457/57 is output B

    A

    END (FRONT AIR MIX DAMPER SERVO MOTOR IS DEFECTIVE)

    B

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly.


    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1457/57 is not output A
      DTC B1457/57 is output B

    A

    END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)

    B

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here