AIR CONDITIONING SYSTEM, Diagnostic DTC:B1456

DTC Code DTC Name
B1456 Air Outlet Damper FOOT/DEF Control Servo Motor Circuit(Passenger Side)

DESCRIPTION


The No. 6 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*1 or No. 2 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*2 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 No. 6 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*1 or No. 2 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*2 to the appropriate 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
B1455 Air Outlet Damper FOOT/DEF Control Servo Motor Circuit (Passenger Side)

  • Diagnosis condition: During No. 6 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*1 or No. 2 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*2 operation

  • Malfunction status: The damper servo operation request signal is output but the position information of the servo does not change or servo is malfunctioning

  • Detection time: Continuously for 30 seconds or more

  • No. 6 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*1

  • No. 2 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*2

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

 Memorized
DTC Diagnosis Condition Combination Table
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition During No. 6 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*1 or No. 2 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT)*2 operation ○ ○
Malfunction Status The damper servo operation request signal is output but the position information of the servo does not change ○ -
The damper servo operation request signal is output but the position information of the servo is malfunctioning - ○
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 match either of these patterns, a DTC will be output.

WIRING DIAGRAM

Figure 1. for LHD:

B004UMQE53

Figure 2. for RHD:

B004UMQE68

CAUTION / NOTICE / HINT

Note


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

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

  • When the servo motor is replaced, be sure to perform servo motor initialization.

    Click here

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. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B1456 is output A
      DTC B1456 and B1497 are output. B

    B

    GO TO DTC B1497 Click here

    A

  2. CHECK AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Check for No. 6 air conditioning radiator damper servo sub-assembly*1 or No. 2 air conditioning radiator damper servo sub-assembly*2 is installed correctly.

      OK
      No. 6 air conditioning radiator damper servo sub-assembly*1 or No. 2 air conditioning radiator damper servo sub-assembly*2 is installed correctly.

      • *1: for LHD

      • *2: for RHD

      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REINSTALL NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    C

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

    A

  3. CHECK 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. CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)


    1. Remove the No. 6 air conditioning radiator damper servo sub-assembly*1 or No. 2 air conditioning radiator damper servo sub-assembly*2.

      Click here


      • *1: for LHD

      • *2: for RHD

    2. Operate the dampers by hand.

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

    NG

    REPAIR OR REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

    OK

  5. PERFORM ACTIVE TEST USING GTS (FACE A/O SERVO PULSE(D))


    • *1: for LHD

    • *2: for RHD

    • *3: Actually operates the No. 6 air conditioning radiator damper servo sub-assembly*1 or No. 2 air conditioning radiator damper servo sub-assembly*2 (front passenger side MODE FOOT).


    1. Remove the No. 6 air conditioning radiator damper servo sub-assembly*1 or No. 2 air conditioning radiator damper servo sub-assembly*2.

      Click here

    2. Connect the No. 6 air conditioning radiator damper servo sub-assembly*1 or No. 2 air conditioning radiator damper servo sub-assembly*2 (front passenger side MODE FACE) connector to No. 6 air conditioning radiator damper servo sub-assembly*1 or No. 2 air conditioning radiator damper servo sub-assembly*2 (front passenger side MODE FOOT).

    3. Connect the GTS to the DLC3.

    4. Turn the power switch on (IG).

    5. Turn the GTS on.

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

    7. Check the operation by referring to the table below.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Restrict Condition
      Face A/O Servo Pulse(P)

        for LHD:

      • No. 6 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT) operation*3


        for RHD:

      • No. 2 air conditioning radiator damper servo sub-assembly (front passenger side MODE FOOT) operation

      Min.: 128

      Max.: 383

        for LHD:

      • Operates between 147 and 254 pulses


        for RHD:

      • Operates between 258 and 365 pulses

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Face A/O Servo Pulse(P)
      OK
      No. 6 air conditioning radiator damper servo sub-assembly*1 or No. 2 air conditioning radiator damper servo sub-assembly*2 (front passenger side MODE FOOT) is operated.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY Click here

    NG

  6. CHECK AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


    1. Interchange the MODE FOOT servo motor with MODE FACE servo motor and connect the connectors to them.

      Click here

    2. Clear the DTCs.

      Click here

    3. Check for DTCs.

      Click here

      Result
      Result Proceed to
      DTC B1448 is output (for LHD) A
      DTC B1448 is output (for RHD) B
      DTC B1456 is output C
      DTCs are not output D

      Tech Tips

      Codes other than DTC B1448 and B1456 may be output at this time, but they are not related to this check.


    A

    REPLACE NO. 6 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY Click here

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    D

    USE SIMULATION METHOD TO CHECK Click here