AIR CONDITIONING SYSTEM, Diagnostic DTC:B1447/47

DTC Code DTC Name
B1447/47 Rear Air Mix Damper Control Servo Motor Circuit on Driver Side

DESCRIPTION

The rear air mix damper servo motor (for driver side) sends pulse signals to indicate the damper position to the air conditioning amplifier assembly. The air conditioning amplifier assembly activates the motor (normal or reverse) based on these signals to move the rear air mix damper to the appropriate position. This adjusts the amount of air passing through the heater core after passing the evaporator and controls the temperature of the blown air.

Tech Tips

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

DTC Code DTC Detection Condition Trouble Area
B1447/47 The rear air mix damper position does not change even if the air conditioning amplifier assembly operates the rear air mix damper servo motor.

  • Rear air mix damper servo motor

  • No. 2 air conditioning harness assembly

  • Harness or connector between No. 2 air conditioning harness assembly and air conditioning amplifier assembly

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01EQTVE12

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (REAR AIR MIX DAMPER SERVO MOTOR)


    1. Use the Data List to check if the servo motor is functioning properly.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/M Servo Targ Pulse (Rear D)

      Rear air mix damper servo motor target pulse /

      Min.: 9, Max.: 54 (for LHD)

      Min.: 8, Max.: 53 (for RHD)

      for LHD


      • MAX COOL: 9 (pulse)

      • MAX HOT: 54 (pulse)

      for RHD


      • MAX COOL: 53 (pulse)

      • MAX HOT: 8 (pulse)

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

    B

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK HARNESS AND CONNECTOR (NO. 2 AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)

    A01EOI2E01

    1. Disconnect the K19 No. 2 air conditioning harness assembly connector.

    2. Disconnect the E36 amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K19-2 (RBUG) - E36-12 (RBUG) Always Below 1 Ω
      K19-3 (RBUS) - E36-13 (RBUS)
      K19-4 (RBBU) - E36-14 (RBBU)
      E36-12 (RBUG) - Body ground Always 10 kΩ or higher
      E36-13 (RBUS) - Body ground
      E36-14 (RBBU) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK REAR AIR MIX DAMPER SERVO MOTOR


    1. Replace the rear air mix damper servo motor Click here.

      Tech Tips

      Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo motor with a normal one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1447/47 is not output A
      DTC B1447/47 is output B

    B

    CHECK NO. 2 AIR CONDITIONING HARNESS ASSEMBLY Click here

    A

    END (REAR AIR MIX DAMPER SERVO MOTOR IS DEFECTIVE)

  4. CHECK NO. 2 AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the No. 2 air conditioning harness assembly Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1447/47 is not output A
      DTC B1447/47 is output B

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

    END (NO. 2 AIR CONDITIONING HARNESS ASSEMBLY IS DEFECTIVE)