AIR CONDITIONING SYSTEM, Diagnostic DTC:B1459/59

DTC Code DTC Name
B1459/59 Max Hot Bypass Damper HOT Control Circuit

DESCRIPTION

The max hot bypass damper servo motor (for HOT) 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 max hot bypass damper servo motor (for HOT) to any position. As a result, when the air conditioner is operating, the temperature of the air blowing toward the driver's head area is controlled.

Tech Tips

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

DTC No. DTC Detection Condition Trouble Area
B1459/59 Max hot bypass damper servo motor (for HOT) position sensor value does not change even if air conditioning amplifier operates max hot bypass damper servo motor

  • Max hot bypass damper servo motor (for HOT)

  • Air conditioning harness

  • Air conditioning amplifier

WIRING DIAGRAM

A0019KWE23

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1459/59 is not output A
      DTC B1459/59 is output B
      DTC B1459/59 and B1497/97 are output C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO DTC B1497/97 Click here

    B

  2. READ VALUE USING INTELLIGENT TESTER (MAX HOT BYPASS DAMPER SERVO MOTOR TARGET PULSE (for HOT))


    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
      M/H Bypass HOT Targ Pls

      Max hot bypass servo motor HOT target pulse /

      Min.: 0, Max.: 255

      		 Customized value will be displayed -
      OK
      The display is as specified in the normal condition.

    2. Visually inspect the max hot bypass damper servo motor (for HOT).


      1. Visually inspect whether the max hot bypass damper servo motor (for HOT) operates.

        OK
        The max hot bypass damper servo motor (for HOT) operates.
        Result
        Result Proceed to
        The Data List value changes and the max hot bypass damper servo motor (for HOT) operates (When troubleshooting according to the DTC output) A
        The Data List value changes and the max hot bypass damper servo motor (for HOT) operates (When troubleshooting according to Problem Symptoms Table) B
        The Data List value does not change and the max hot bypass damper servo motor (for HOT) does not operate C
        The Data List value changes, but the max hot bypass damper servo motor (for HOT) does not operate D

    B

    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    D

    CHECK MAX HOT BYPASS SERVO MOTOR (for HOT) Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1459/59 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

  4. CHECK MAX HOT BYPASS SERVO MOTOR (for HOT)


    1. Replace the max hot bypass 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 normal one and check that the condition returns to normal.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1459/59 is not output.

    OK

    END (MAX HOT BYPASS SERVO MOTOR [for HOT] IS FAULTY)

    NG

  5. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1459/59 is not output.

    OK

    END (AIR CONDITIONING HARNESS IS FAULTY)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here