AIR CONDITIONING SYSTEM, Diagnostic DTC:B1454/54

DTC Code DTC Name
B1454/54 Passenger Side Air Outlet Damper COOL Control Servo Motor Circuit

DESCRIPTION

The air mix damper servo (for passenger side COOL) 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 mix damper (for passenger side COOL) 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 passenger side 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 Code DTC Detection Condition Trouble Area
B1454/54 Air mix damper position sensor value does not change even if air conditioning amplifier operates air mix servo motor

  • Air mix servo motor (for passenger side COOL)

  • Air conditioning harness

  • Air conditioning amplifier

WIRING DIAGRAM

A000VTJE99

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1454/54 is not output A
      DTC B1454/54 is output B
      DTC B1454/54 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 (AIR MIX SERVO MOTOR TARGET PULSE (for Passenger Side COOL))


    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
      COOL A/M Servo Targ Pls(P)

      Passenger side COOL air mix servo motor target pulse /

      Min.: 90, Max.: 194

      MAX COOL: 194 (pulse)

      MIN COOL: 90 (pulse)

      		 -
      OK
      The display is as specified in the normal condition.

    2. Visually inspect the air mix servo motor (for passenger side HOT).


      1. Visually inspect whether the air mix servo motor (for passenger side HOT) operates.

        OK
        The air mix servo motor (for passenger side HOT) operates.
        Result
        Result Proceed to
        The Data List value changes and the air mix servo motor (for passenger side HOT) operates (When troubleshooting according to the DTC output) A
        The Data List value changes and the air mix servo motor (for passenger side HOT) operates (When troubleshooting according to Problem Symptoms Table) B
        The Data List value does not change and the air mix servo motor (for passenger side HOT) does not operate C
        The Data List value changes, but the air mix servo motor (for passenger side 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 AIR MIX SERVO MOTOR (for Passenger Side COOL) Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1454/54 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here

  4. CHECK AIR MIX SERVO MOTOR (for Passenger Side COOL)


    1. Replace the air mix 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.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1454/54 is not output.

    OK

    END (AIR MIX SERVO MOTOR (for Passenger Side COOL) IS FAULTY)

    NG

  5. CHECK AIR CONDITIONING HARNESS


    1. Replace the air conditioning harness Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1454/54 is not output.

    OK

    END (AIR CONDITIONING HARNESS IS FAULTY)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER Click here