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AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1446/46

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DTC Code DTC Name
B1446/46 Air Mix Damper Control Servo Motor Circuit (Driver Side)
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DESCRIPTION

The front air mix damper servo motor (for driver side) 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 (for driver side) 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 driver side is controlled.

Tip:

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

DTC Code DTC Detection Condition Trouble Area
B1446/46 The air mix damper position does not change even if the air conditioning amplifier assembly operates the air mix damper servo motor.

  • Air mix damper servo motor (for driver side)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly
A015B4NE10
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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 MIX DAMPER SERVO MOTOR)


    1. Use the Data List to check if the servo motor is functioning properly.

      Table 1. Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Mix Servo Targ Pulse(D)

      Air mix damper servo motor (for driver side) target pulse /

      Min.: 8, Max.: 90 (for LHD)

      Min.: 8, Max.: 90 (for RHD)

      for LHD


      • MAX COOL: 90 (pulse)

      • MAX HOT: 8 (pulse)

      for RHD


      • MAX COOL: 8 (pulse)

      • MAX HOT: 90 (pulse)

      		 -
      OK
      The display is as specified in the normal condition.
      Table 2. Result
      Result Proceed to
      OK (Checking from the DTC) A
      OK (Checking from the PROBLEM SYMPTOMS TABLE) B
      NG C

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    CHECK AIR MIX DAMPER SERVO MOTOR (FOR DRIVER SIDE)


    1. Replace the air mix damper servo motor (for driver side).


      Tip:

      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).

      Table 3. Result
      Result Proceed to
      DTC B1446/46 is not output A
      DTC B1446/46 is output B

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    CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly.


    2. Clear the DTCs (Click here).

    3. Check for DTCs (Click here).

      Table 4. Result
      Result Proceed to
      DTC B1446/46 is not output A
      DTC B1446/46 is output B

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    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  5. Click here

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

  6. Click here

    END (AIR MIX DAMPER SERVO MOTOR [FOR DRIVER SIDE] IS DEFECTIVE)

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    END (AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)