AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1443/43

DTC Code DTC Name
B1443/43 Air Outlet Damper Control Servo Motor Circuit

DESCRIPTION

The mode 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, reverse) based on the signals to move the mode damper servo sub-assembly to any 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
B1443/43 Air Outlet Damper Control Servo Motor Circuit Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates mode damper servo sub-assembly

  • Mode damper servo sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

Memorized

(30 sec. or more)*1

WIRING DIAGRAM

B0044WIE07

CAUTION / NOTICE / HINT

Tech Tips

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

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Operate the MODE switch.

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

    6. Check the value(s) by referring to the table below.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Air Outlet Servo Pulse (D) Mode damper servo sub-assembly target pulse

      Min.: 0

      Max.: 255

      FACE: 47 (pulse)

      B/L: 37 (pulse)

      FOOT: 18 (pulse)

      FOOT/DEF: 9 (pulse)

      DEF: 5 (pulse)

      		 -

      Body Electrical > Air Conditioner > Data List
      Tester Display
      Air Outlet Servo Pulse (D)
      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
      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. REPLACE MODE DAMPER SERVO SUB-ASSEMBLY


    1. Replace the mode damper servo sub-assembly.

      Click here

      Tech Tips

      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 the DTC.


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1443/43 is output A
      DTC B1443/43 is not output B

    B

    END (MODE DAMPER SERVO SUB-ASSEMBLY WAS DEFECTIVE)

    A

  3. REPLACE AIR CONDITIONING HARNESS ASSEMBLY


    1. Replace the air conditioning harness assembly.

      Click here

      Tech Tips

      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 the DTC.


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1443/43 is output A
      DTC B1443/43 is not output B

    A

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    B

    END (AIR CONDITIONING HARNESS ASSEMBLY WAS DEFECTIVE)