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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 No. 1 air conditioning radiator damper servo sub-assembly (air outlet) sends pulse signals to inform the air conditioning amplifier assembly of the damper position. The air conditioning amplifier assembly activates the motor (normal, reverse) based on the signals to move the No. 1 air conditioning radiator damper servo sub-assembly (air outlet) to any position, which controls the air outlet switching.

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

Tip:

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

DTC No. DTC Detection Condition Trouble Area
B1443/43 Air outlet damper position sensor value does not change even though air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly (air outlet)
  • No. 1 air conditioning radiator damper servo sub-assembly (air outlet)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

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WIRING DIAGRAM

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PROCEDURE


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    READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Operate the MODE switch.

    5. Enter the following menus: Body Electrical / 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 Outlet Servo Actual Pulse (D)

      No. 1 air conditioning radiator damper servo sub-assembly (air outlet) actual pulse /

      Min.: 0, Max.: 255

      FACE: 8 (pulse)

      B/L: 30 (pulse)

      FOOT (manual mode) : 67 (pulse)

      FOOT (automatic mode) : 60, 67 or 74 (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 (When troubleshooting according to Problem Symptoms Table) B
      OK (When troubleshooting according to the DTC) C

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    PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / 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 Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (air outlet) pulse Min.: 0, Max.: 255 Operates between 8 and 97 pulses
      OK
      Air flow position changes in accordance with each control range.

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    REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (AIR OUTLET)


    1. Replace the No. 1 air conditioning radiator damper servo sub-assembly (air outlet) (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 known good one and check that the condition returns to normal.

    2. Check for DTCs.

      Result
      Result Proceed to
      DTC B1443/43 is output A
      DTC B1443/43 is not output B

    • AClick here
    • B

      END (NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

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    REPLACE AIR CONDITIONING HARNESS ASSEMBLY


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

      Tip:

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

    2. Check for DTCs.

      Result
      Result Proceed to
      DTC B1443/43 is output A
      DTC B1443/43 is not output B

    • A

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

    • B

      END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)