AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B1447

DTC Code DTC Name
B1447 Air Mix Damper Control Servo Motor Circuit (Rear)

DESCRIPTION

The rear air mix damper servo sub-assembly 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 air mix damper to any position. As a result, the amount of air passing through the heater core after passing through the evaporator is adjusted and the temperature of the air blowing toward the rear is controlled.

The air conditioning amplifier communicates with the servo through the No. 2 air conditioning harness assembly.

Tech Tips

Confirm that there are no mechanical problems because this DTC may be stored when either a damper link or damper is mechanically locked.

DTC Code DTC Detection Condition Trouble Area
B1447 Rear air mix damper position does not change when the air conditioning amplifier operates the rear air mix damper servo sub-assembly.

  • Rear air mix damper servo sub-assembly

  • No. 2 air conditioning harness assembly

  • Harness or connector

  • Air conditioning amplifier

WIRING DIAGRAM

B001DSAE06
*a Rear Air Mix Damper Servo Sub-assembly
*b Air Conditioning Amplifier Assembly
*c No. 2 Air Conditioning Harness Assembly

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1447 is not output A
      DTC B1447 is output B
      DTC B1447 and B1497 are output C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    GO TO B1497 Click here

    B

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


    1. Use the Data List to check if the rear air mix damper servo sub-assembly is functioning properly Click here.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Air Mix Servo Targ Pulse (R) Rear air mix damper servo sub-assembly target pulse / Min.: 0, Max.: 255

      9 (pulse): MAX COOL

      54 (pulse): MAX HOT

      		 -
      Air Mix Servo Actual Pulse (R) Rear air mix damper servo sub-assembly actual pulse / Min.: 0, Max.: 255

      9 (pulse): MAX COOL

      54 (pulse): MAX HOT

      		 -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      OK (When troubleshooting according to the DTC) A
      OK (When troubleshooting according to Problem Symptoms Table) B
      Both target pulse and actual pulse do not display C
      Target pulse displays normally, but actual pulse does not display D

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    D

    CHECK REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY Click here

    A

  3. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B1447 is not output.

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  4. CHECK REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY


    1. Replace the rear air mix damper servo sub-assembly Click here.

      Tech Tips

      Since the rear air mix damper servo sub-assembly cannot be inspected while it is removed from the vehicle, replace the rear air mix damper servo sub-assembly with a new or normally functioning one.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1447 is not output.

    OK

    END (REAR AIR MIX DAMPER SERVO SUB-ASSEMBLY IS FAULTY)

    NG

  5. CHECK AIR CONDITIONING HARNESS ASSEMBLY


    1. Temporarily replace the air conditioning harness assembly with a new or normally functioning one Click here.

    2. Clear the DTCs Click here.

    3. Check for DTCs Click here.

      OK
      DTC B1447 is not output.

    OK

    END (AIR CONDITIONING HARNESS ASSEMBLY IS FAULTY)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here