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 No. 1 blower 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 for 30 seconds or more when the air conditioning amplifier assembly operates the No. 1 blower damper servo sub-assembly.

  • No. 1 blower damper servo sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01X3FVE01

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (AIR INLET DAMPER TARG PULSE)


    1. Use the Data List to check if the No. 1 blower 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 No. 1 blower damper servo sub-assembly target pulse / Min.: 0, Max.: 255

        for LHD

      • Recirculation: 37 (pulse)

      • Fresh: 9 (pulse)


        for RHD

      • Recirculation: 9 (pulse)

      • Fresh: 37 (pulse)

      		 -
      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
      NG C

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY


    1. Temporarily replace the No. 1 blower damper servo sub-assembly Click here.

      Tech Tips

      Since the No. 1 blower damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the No. 1 blower damper servo sub-assembly with a new or normally functioning one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1442 is not output A
      DTC B1442 is output B

    A

    END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

    B

  3. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Temporarily replace the air conditioning harness assembly with a new or normally functioning one.


    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1442 is not output A
      DTC B1442 is output B

    A

    END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here