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AIR CONDITIONING SYSTEM, Diagnostic DTC:B1455

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DTC Code DTC Name
B1455 Air Outlet Damper FOOT/DEF Control Servo Motor Circuit (Passenger Side)
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DESCRIPTION

The No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT) 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. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT) 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. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT) 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. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT)

  • Air conditioning harness assembly

  • Air conditioning amplifier assembly

 Memorized
Table 1. DTC Diagnosis Condition Combination Table
  Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition During No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT) 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
Tip:

If the conditions match either of these patterns, a DTC will be output.

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WIRING DIAGRAM

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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.

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Tip:

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

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PROCEDURE


  1. Click here

    CHECK FOR DTC


    1. Check for DTCs.

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      1. Body Electrical > Air Conditioner > Trouble Codes


      Result
      Result Proceed to
      DTC B1455 is output A
      DTC B1455 and B1497 are output. B

  2. Click here

    CHECK NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLY


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

      OK
      No. 1 air conditioning radiator damper servo sub-assembly is installed correctly.
      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK NO. 1 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

  4. Click here

    CHECK AIR CONDITIONING RADIATOR ASSEMBLY (DAMPER)


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

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    2. Operate the dampers by hand.

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

    • OKClick here
    • NG

      REPAIR OR REPLACE AIR CONDITIONING RADIATOR ASSEMBLY

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


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

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    2. Connect the No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE) connector to No. 1 air conditioning radiator damper servo sub-assembly (driver 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.


      1. Body Electrical > Air Conditioner > Active Test
        Tester Display Measurement Item Control Range Restrict Condition
        Face A/O Servo Pulse(D) No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FACE) operation

        Min.: 128

        Max.: 383
        • for LHD:

        • Operates between 258 and 365 pulses


        • for RHD:

        • Operates between 147 to 254 pulses



      • *: Actually operates the No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT).


      1. Body Electrical > Air Conditioner > Active Test
        Tester Display
        Face A/O Servo Pulse(D)




      OK
      No. 1 air conditioning radiator damper servo sub-assembly (driver side MODE FOOT) is operated.
      Result
      Proceed to
      OK
      NG

  6. Click here

    CHECK NO. 1 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.

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    2. Clear the DTCs.

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    3. Check for DTCs.

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      Result
      Result Proceed to
      DTC B1443 is output A
      DTC B1455 is output B
      DTCs are not output C
      Tip:

      Codes other than DTC B1443 and B1455 may be output at this time, but they are not related to this check.


    • A

      REPLACE NO. 1 AIR CONDITIONING RADIATOR DAMPER SERVO SUB-ASSEMBLYClick here

    • B

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

    • C

      USE SIMULATION METHOD TO CHECKClick here