AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B1442

DTC Code DTC Name
B1442 Air Inlet Damper Control Servo Motor Circuit

DESCRIPTION

The recirculation damper servo sub-assembly 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 inlet damper to any position, which controls the intake air settings (fresh, fresh/recirculation and recirculation).

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
B1442 The air inlet damper position does not change when the air conditioning amplifier assembly operates the recirculation damper servo sub-assembly.

  • Recirculation damper servo sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

B001DE8E98

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1442 is not output A
      DTC B1442 is output B
      DTC B1442 and B1497 are output C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO B1497 Click here

    B

  2. READ VALUE USING INTELLIGENT TESTER (RECIRCULATION DAMPER SERVO)


    1. Use the Data List to check if the recirculation damper servo sub-assembly is functioning properly Click here.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Inlet Damper Targ Pulse Recirculation damper servo sub-assembly target pulse / Min.: 0, Max.: 255

      7 (pulse): Recirculation

      26 (pulse): Fresh

      		 -
      Air Inlet Damper Actual Pulse Recirculation damper servo sub-assembly actual pulse / Min.: 0, Max.: 255

      7 (pulse): Recirculation

      26 (pulse): Fresh

      		 -
      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 RECIRCULATION DAMPER SERVO SUB-ASSEMBLY Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1442 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  4. CHECK RECIRCULATION DAMPER SERVO SUB-ASSEMBLY


    1. Replace the recirculation damper servo sub-assembly Click here.

      Tech Tips

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

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1442 is not output.

    OK

    END (RECIRCULATION DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

    NG

  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 B1442 is not output.

    OK

    END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here