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LIGHTING SYSTEM(w/ Automatic Headlight Beam Level Control System), Diagnostic DTC:B2456

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DTC Code DTC Name
B2456 Left Headlight ECU Variation Error
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DESCRIPTION

This DTC is stored if the headlight ECU sub-assembly LH for another destination is installed.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B2456 Left Headlight ECU Variation Error
  • Detection condition:

  • The ignition switch is ON.


  • Malfunction status:

  • Vehicle specification information received via CAN communication is continuously mismatched


  • Malfunction duration:

  • -

  • ECM

  • Main body ECU (multiplex network body ECU)

  • Headlight ECU sub-assembly LH

 Headlight ECU sub-assembly LH
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CAUTION / NOTICE / HINT

Note:

  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

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  • The vehicle battery supplies power to the main body ECU (multiplex network body ECU) via the door control battery. Therefore, before performing this troubleshooting procedure, make sure to perform an on-vehicle inspection to confirm that the main body ECU (multiplex network body ECU) power source circuit is normal.*1

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  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.*2

  • Before replacing the ECM, refer to Service Bulletin.*2


    • *1: w/ Door Control Battery

    • *2: w/ Smart Entry and Start System

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PROCEDURE


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    CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.

    5. Clear the DTCs.


      1. Body Electrical > HL AutoLeveling > Clear DTCs


      Result
      Proceed to
      NEXT

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    CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.

    5. Check for DTCs.


      1. Body Electrical > HL AutoLeveling > Trouble Codes


      OK
      DTC B2456 is not output.
      Result
      Proceed to
      OK
      NG

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    CHECK ECM


    1. Check if the part number of the ECM installed to the vehicle is correct.

      OK
      Part number is correct.
      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Check if the part number of the main body ECU (multiplex network body ECU) installed to the vehicle is correct.

      OK
      Part number is correct.
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE HEADLIGHT ECU SUB-ASSEMBLY LHClick here

    • NG

      REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)Click here