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AIR CONDITIONING SYSTEM, Diagnostic DTC:B1442/42

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DTC Code DTC Name
B1442/42 Air Inlet Damper Control Servo Motor Circuit
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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 these signals to move the air inlet mode selection No. 1 blower damper servo sub-assembly to the appropriate position, which controls the air inlet mode (fresh, recirculation/fresh, and recirculation).

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

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1442/42 Air Inlet Damper Control Servo Motor Circuit Air inlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 blower damper servo sub-assembly

  • No. 1 blower damper servo sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

Memorized

(30 sec. or more)*

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Tip:

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

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PROCEDURE


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    READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Operate the recirculation/fresh switch.

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

    6. Read the Data List according to the display on the GTS.


      1. Body Electrical > Air Conditioner > Data List
        Tester Display Measurement Item Range Normal Condition Diagnostic Note
        Air Inlet Damper Targ Pulse No. 1 blower damper servo sub-assembly target pulse

        Min.: 128

        Max.: 383
        • for LHD:

        • Recirculation: 238 (pulse)

        • Fresh: 206 (pulse)


        • for RHD:

        • Recirculation: 274 (pulse)

        • Fresh: 306 (pulse)

        		 -
        Air Inlet Damper Actual Pulse No. 1 blower damper servo sub-assembly actual pulse

        Min.: 128

        Max.: 383
        • for LHD:

        • Recirculation: 238 (pulse)

        • Fresh: 206 (pulse)


        • for RHD:

        • Recirculation: 274 (pulse)

        • Fresh: 306 (pulse)

        		 -




      1. Body Electrical > Air Conditioner > Data List
        Tester Display
        Air Inlet Damper Targ Pulse
        Air Inlet Damper Actual Pulse





      OK
      When the recirculation/fresh switch is operated, the actual pulse changes following the target pulse.
      Result
      Result Proceed to
      Target pulse changes but actual pulse does not change A
      Target pulse and actual pulse do not change B
      Actual pulse changes following the target pulse (When troubleshooting according to the DTC) C
      Actual pulse changes following the target pulse (When troubleshooting according to Problem Symptoms Table) D

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    REPLACE NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 blower damper servo sub-assembly.

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      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.

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      1. Body Electrical > Air Conditioner > Trouble Codes


      Result
      Result Proceed to
      DTC B1442/42 is output A
      DTC B1442/42 is not output B

    • AClick here
    • B

      END (NO. 1 BLOWER DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

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    REPLACE AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly.

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      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.

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      1. Body Electrical > Air Conditioner > Trouble Codes


      Result
      Result Proceed to
      DTC B1442/42 is output A
      DTC B1442/42 is not output B

    • A

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

    • B

      END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)

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    RECONFIRM DTC OUTPUT


    1. Check for DTCs.

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      1. Body Electrical > Air Conditioner > Trouble Codes


      Result
      Result Proceed to
      DTC B1442/42 is output A
      DTC B1442/42 is not output B