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AIR CONDITIONING SYSTEM, Diagnostic DTC:B1441/41

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DTC Code DTC Name
B1441/41 Air Mix Damper Control Servo Motor Circuit (Passenger Side)
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DESCRIPTION

The air mix control servo motor sends pulse signals to indicate the damper position to the A/C amplifier. The A/C amplifier activates the motor (normal or reverse) based on these signals to move the air mix damper (front passenger side) to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted, and the temperature of the air blowing toward the passenger side is controlled.

The A/C amplifier communicates with the servo through a communication/driver IC and wiring assembly called the air conditioning harness.

Tip:

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

DTC No. DTC Detection Condition Trouble Area
B1441/41 Air mix damper position sensor value does not change even if A/C amplifier operates air mix control servo motor

  • Air mix control servo motor

  • Air conditioning harness

  • A/C amplifier
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


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    READ VALUE USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Operate the front passenger side temperature adjustment switch.

    5. Enter the following menus: Body / Air Conditioner / Data List.

    6. Check the value(s) by referring to the table below.

      Table 1. Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Mix Servo Targ Pulse (P) Passenger side air mix servo motor target pulse / Min.: 0, Max.: 255

      for RHD:

      MAX. COLD: 12 (pulse)

      MAX. HOT: 115 (pulse)

      for LHD:

      MAX. COLD: 117 (pulse)

      MAX. HOT: 19 (pulse)

      		 -
      OK
      The display is as specified in the Normal Condition column.
      Result
      Result Proceed to
      NG A
      OK (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

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    PERFORM ACTIVE TEST USING INTELLIGENT TESTER


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Air Conditioner / Active Test.

    5. Check the operation by referring to the table below.

      Table 2. Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Air Mix Servo Targ Pulse (P) Air mix servo motor pulse (P side) Min.: 0, Max.: 255 -
      OK
      Air temperature changes in accordance with each control range.

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    INSPECT AIR MIX CONTROL SERVO MOTOR


    1. Replace the air mix control servo motor (Click here).

      Tip:

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a new or a known good one and check that the condition returns to normal.

    2. Check for the DTC.

      Result
      Result Proceed to
      DTC B1441/41 is output A
      DTC B1441/41 is not output B

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    REPLACE AIR CONDITIONING HARNESSClick here

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    INSPECT AIR CONDITIONING HARNESS


    1. Replace the air conditioning harness (Click here).

      Tip:

      Since the air conditioning harness cannot be inspected while it is removed from the vehicle, replace the air conditioning harness with a new or a known good one and check that the condition returns to normal.

    2. Check for the DTC.

      Result
      Result Proceed to
      DTC B1441/41 is output A
      DTC B1441/41 is not output B

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    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  7. Click here

    REPLACE A/C AMPLIFIERClick here

  8. Click here

    REPLACE AIR MIX CONTROL SERVO MOTORClick here