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AIR CONDITIONING SYSTEM, Diagnostic DTC:B1455/55

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DTC Code DTC Name
B1455/55 Driver Side Air Outlet Damper FOOT/DEF Control Servo Motor Circuit
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DESCRIPTION

The No. 1 air conditioning radiator 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 No. 1 air conditioning radiator damper servo sub-assembly to the appropriate 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.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1455/55 Driver Side Air Outlet Damper FOOT/DEF Control Servo Motor Circuit Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 1 air conditioning radiator damper servo sub-assembly

  • No. 1 air conditioning radiator 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 mode 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
        A/O Damper DEF Pos(D Side) No. 1 air conditioning radiator damper servo sub-assembly target pulse

        Min.: 128

        Max.: 383

        • FACE1: 164 (pulse)

        • FACE2: 164 (pulse)

        • FACE: 164 (pulse)

        • B/L (manual mode): 164 (pulse)

        • B/L (automatic mode): 164 to 180 (pulse)

        • B/L2: 164 (pulse)

        • FOOT-D: 230 (pulse)

        • FOOT-R: 176 (pulse)

        • FOOT (manual mode): 176 (pulse)

        • FOOT (automatic mode): 176 to 186 (pulse)

        • FOOT/DEF: 270 (pulse)

        • DEF: 270 (pulse)

        		 -
        A/O Damper DEF Actual Pos(D) No. 1 air conditioning radiator damper servo sub-assembly actual pulse

        Min.: 128

        Max.: 383

        • FACE1: 164 (pulse)

        • FACE2: 164 (pulse)

        • FACE: 164 (pulse)

        • B/L (manual mode): 164 (pulse)

        • B/L (automatic mode): 164 to 180 (pulse)

        • B/L2: 164 (pulse)

        • FOOT-D: 230 (pulse)

        • FOOT-R: 176 (pulse)

        • FOOT (manual mode): 176 (pulse)

        • FOOT (automatic mode): 176 to 186 (pulse)

        • FOOT/DEF: 270 (pulse)

        • DEF: 270 (pulse)

        		 -




      1. Body Electrical > Air Conditioner > Data List
        Tester Display
        A/O Damper DEF Pos(D Side)
        A/O Damper DEF Actual Pos(D)





      OK
      When the mode 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 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Replace the No. 1 air conditioning radiator 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 B1455/55 is output A
      DTC B1455/55 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.

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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 B1455/55 is output A
      DTC B1455/55 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 B1455/55 is output A
      DTC B1455/55 is not output B