AIR CONDITIONING SYSTEM (for Manual Air Conditioning System), Diagnostic DTC:B1441

DTC Code DTC Name
B1441 Air Mix Damper Control Servo Motor Circuit (Passenger Side)

DESCRIPTION

The damper servo sub-assembly (air mix damper servo) 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 mix damper to any position. As a result, the air mix damper varies the mixture of hot air from the heater core and cold air from the evaporator so that the temperature of the air is as requested.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area
B1441 The air mix damper position does not change when the air conditioning amplifier assembly operates the damper servo sub-assembly (air mix damper servo).

  • Damper servo sub-assembly (air mix damper servo)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01DR90E54

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1441 is not output A
      DTC B1441 is output B
      DTC B1441 and B1497 are output C

    B

    READ VALUE USING INTELLIGENT TESTER (AIR MIX DAMPER SERVO) Click here

    C

    GO TO B1497 Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  2. READ VALUE USING INTELLIGENT TESTER (AIR MIX DAMPER SERVO)


    1. Use the Data List to check if the damper servo sub-assembly (air mix damper servo) is functioning properly Click here.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Mix Servo Targ Pulse (D) Damper servo sub-assembly (air mix damper servo) target pulse / Min.: 0, Max.: 255

      112 or 127 (pulse): MAX COOL

      21 or 31 (pulse): MAX HOT

      		 -
      Air Mix Servo Actual Pulse (D) Damper servo sub-assembly (air mix damper servo) actual pulse / Min.: 0, Max.: 255

      112 or 127 (pulse): MAX COOL

      21 or 31 (pulse): MAX HOT

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

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    D

    CHECK DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO) Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1441 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  4. CHECK DAMPER SERVO SUB-ASSEMBLY (AIR MIX DAMPER SERVO)


    1. Replace the damper servo sub-assembly (air mix damper servo) Click here.

      Tech Tips

      Since the damper servo sub-assembly (air mix damper servo) cannot be inspected while it is removed from the vehicle, replace the damper servo sub-assembly (air mix damper servo) with a new or normally functioning one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1441 is not output.

    NG

    CHECK AIR CONDITIONING HARNESS ASSEMBLY Click here

    OK

    END (DAMPER SERVO SUB-ASSEMBLY [AIR MIX DAMPER SERVO] 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 B1441 is not output.

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

    END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)