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AIR CONDITIONING SYSTEM (for Manual Air Conditioning System), Diagnostic DTC:B1443/43

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DTC Code DTC Name
B1443/43 Air Outlet Damper Control Servo Motor Circuit
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DESCRIPTION

The damper servo sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the mode damper to the appropriate position, which controls the air outlet modes.

Tip:

Confirm that there are no mechanical problems because this DTC can be set if either a damper link or damper is mechanically locked.

DTC No. DTC Detection Condition Trouble Area
B1443/43 Air outlet damper position does not change even if air conditioning amplifier operates air outlet damper control servo motor

  • Air outlet control servo motor

  • Air conditioning harness

  • Air conditioning amplifier
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (AIR OUT PULSE)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG) and turn the intelligent tester main switch on.

    3. Select the item below in the Data List, and read the value displayed on the intelligent tester.

      Table 1. Data List / Air Conditioner:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Out Pulse

      Air outlet servo motor target pulse /

      Min.: 0, Max.: 255

      FACE: 8 (pulse)

      B/L: 30 (pulse)

      FOOT: 67 (pulse)

      FOOT/DEF: 80 (pulse)

      DEF: 97 (pulse)

      		 -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      NG A
      OK (Checking from PROBLEM SYMPTOMS TABLE) B
      OK (Checking from DTC) C

  2. Click here

    REPLACE AIR OUTLET CONTROL SERVO MOTOR


    1. Replace air outlet control servo motor (Click here).


  3. Click here

    CHECK DTC OUTPUT


    1. Check for DTC.

      OK
      DTC B1443/43 is not output.

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    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  5. Click here

    REPAIR OR REPLACE AIR CONDITIONING HARNESS

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    REPLACE AIR CONDITIONING AMPLIFIERClick here

  7. Click here

    END