AIR CONDITIONING SYSTEM(for Manual Air Conditioning System), Diagnostic DTC:B1449

DTC Code DTC Name
B1449 Air Outlet Damper Control Servo Motor Circuit (Rear)

DESCRIPTION

The No. 2 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 air outlet damper to the appropriate position, which controls the rear 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
B1449 Air Outlet Damper Control Servo Motor Circuit (Rear) Air outlet damper position sensor value does not change even if air conditioning amplifier assembly operates No. 2 air conditioning radiator damper servo sub-assembly

  • No. 2 air conditioning radiator damper servo sub-assembly

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

  • Air conditioning radiator assembly

Memorized

(30 sec. or more)*

DTC Detection Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition No. 2 air conditioning radiator damper servo sub-assembly operating ○ ○
Malfunction Air outlet damper servo operation request signals are output but the rear passenger side air outlet damper position sensor value does not change ○ -
Air outlet damper servo operation request signals are output but the rear passenger side air outlet damper position sensor value is abnormal - ○
Detection Time Continuously for 30 seconds or more Continuously for 30 seconds or more
Trip Count 1 trip 1 trip

Tech Tips

If the conditions of either of these patterns are detected, a DTC will be stored.

WIRING DIAGRAM

B006Z4NE02
*1 No. 2 Air Conditioning Radiator Damper Servo Sub-assembly
*2 Air Conditioning Amplifier Assembly
*3 Air Conditioning Harness Assembly
*4 LIN Communication Line

CAUTION / NOTICE / HINT

Tech Tips


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

  • When installing a damper servo motor, make sure to install it correctly.

    Click here

  • After replacing a damper servo motor, make sure to perform Servo Motor Initialization.

    Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      B1497 is not output A
      B1497 is output B

    B

    GO TO DTC B1497 Click here

    A

  2. INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (INSTALLATION CONDITION)


    1. Check that the No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.

      Click here

      OK
      The No. 2 air conditioning radiator damper servo sub-assembly is installed correctly.
      Result
      Proceed to
      OK
      NG

    NG

    INSTALL NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY CORRECTLY Click here

    OK

  3. INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (MOTOR, LINK, DAMPER)


    1. Check for a wire harness caught between the links of the motors and dampers.

      OK
      No wire harnesses are caught between the links of the motors and dampers.
      Result
      Proceed to
      OK
      NG

    NG

    REMOVE PINCHED WIRE HARNESS

    OK

  4. INSPECT NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY (DAMPER)


    1. Remove the No. 2 air conditioning radiator damper servo sub-assembly.

      Click here

    2. Operate the dampers by hand.

      OK
      The dampers are easily operated by hand.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING RADIATOR ASSEMBLY Click here

    OK

  5. PERFORM ACTIVE TEST USING GTS


    1. Remove the No. 1 air conditioning radiator damper servo sub-assembly.

      Click here

    2. Connect the No. 1 air conditioning radiator damper servo sub-assembly connector to the No. 2 air conditioning radiator damper servo sub-assembly.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

    6. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    7. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Air Outlet Servo Pulse (D) No. 1 air conditioning radiator damper servo sub-assembly (mode) pulse*

      Min.: 128

      Max.: 383

      		 Operates between 241 to 348 pulses

      • *: Though this Active Test is for the No. 1 air conditioning radiator damper servo sub-assembly, in this case it is used to check the operation of the No. 2 air conditioning radiator damper servo sub-assembly.


      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Air Outlet Servo Pulse (D)
      OK
      The No. 2 air conditioning radiator damper servo sub-assembly operates.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    NG

    REPLACE NO. 2 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here