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AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B1449/49

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DTC Code DTC Name
B1449/49 Rear Air Outlet Damper Control Servo Motor Circuit
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DESCRIPTION

The rear outlet control servo motor sends pulse signals to indicate the damper position to the air conditioning amplifier. The air conditioning amplifier activates the motor (normal or reverse) based on these signals to move the rear outlet damper to the appropriate position, which controls the air outlet modes.

Tip:

Confirm that there are no mechanical problems because this DTC can be set if either a damper link or damper is mechanically locked.

DTC No. DTC Detection Condition Trouble Area
B1449/49 Rear air outlet damper position does not change even if air conditioning amplifier operates rear air outlet damper control servo motor

  • Rear air outlet control servo motor

  • Rear air conditioning harness

  • Wire harness between rear air conditioning harness and air conditioning amplifier

  • Air conditioning amplifier
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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 OUT PULSE-R)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch on (IG) and turn the intelligent tester main switch on.

    3. Select the item below in the Data List, and read the value displayed on the intelligent tester.

      Table 1. Data List / Air Conditioner:
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Out Pulse-R

      Rear air outlet control servo motor target pulse /

      Min.: 0, Max.: 255

      Rr FACE: 83 (pulse)

      Rr B/L: 38 (pulse)

      Rr FOOT: 7 (pulse)

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

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    CHECK HARNESS AND CONNECTOR (REAR AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)


    1. A017B7BE08

      Disconnect the N11 rear air conditioning harness connector.

    2. Disconnect the D34 amplifier connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance
      Tester Connection Condition Specified Condition
      N11-2 (RBUG) - D34-1 (RBUG) Always Below 1 Ω
      N11-3 (RBUS) - D34-23 (RBUS) Always Below 1 Ω
      N11-4 (RBBU) - D34-21 (RBBU) Always Below 1 Ω
      D34-1 (RBUG) - Body ground Always 10 kΩ or higher
      D34-23 (RBUS) - Body ground Always 10 kΩ or higher
      D34-21 (RBBU) - Body ground Always 10 kΩ or higher

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    REPLACE REAR AIR OUTLET CONTROL SERVO MOTOR


    1. Replace the rear air outlet control servo motor.


  4. Click here

    END (REAR AIR OUTLET CONTROL SERVO MOTOR IS DEFECTIVE)

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    PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLEClick here

  6. Click here

    REPLACE AIR CONDITIONING AMPLIFIERClick here

  7. Click here

    REPAIR OR REPLACE REAR AIR CONDITIONING HARNESS

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    CHECK DTC OUTPUT


    1. Clear the DTC (Click here).

    2. Check for DTC (Click here).

      OK
      DTC B1449/49 is not output.