LIGHTING SYSTEM, Diagnostic DTC:B2456

DTC Code DTC Name
B2456 Left Headlight ECU Variation Error

DESCRIPTION

This DTC is output when a headlight ECU sub-assembly LH that is incompatible with the vehicle is installed.

The headlight ECU sub-assembly LH outputs DTC B2456.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2456 Left Headlight ECU Variation Error Headlight ECU sub-assembly LH variation mismatch

  • Headlight ECU sub-assembly LH

  • ECM

  • Main body ECU (multiplex network body ECU)

 -

CAUTION / NOTICE / HINT

Note


  • After the headlight ECU sub-assembly LH is replaced, vehicle information registration and initialization are necessary.

    Click here

  • Before replacing the ECM or main body ECU (multiplex network body ECU), refer to Service Bulletin.*1


    • *1: w/ Entry and Start System

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Turn the ignition switch to ON.

    2. Turn on the headlights using the light control switch.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      Result
      Result Proceed to
      DTC B2456 output does not occur A
      DTC B2456 output occurs B

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

  3. CHECK ECM


    1. Check that the ECM part number matches the vehicle.

      Result
      Result Proceed to
      ECM part number matches vehicle A
      ECM part number does not match (for 3ZR-FAE) B
      ECM part number does not match (for 8NR-FTS) C

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    A

  4. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. Check that the main body ECU (multiplex network body ECU) part number matches the vehicle.

      Result
      Result Proceed to
      Main body ECU (multiplex network body ECU) part number matches vehicle A
      Main body ECU (multiplex network body ECU) part number does not match (for LHD) B
      Main body ECU (multiplex network body ECU) part number does not match (for RHD) C

    A

    REPLACE HEADLIGHT LIGHT CONTROL ECU SUB-ASSEMBLY LH Click here

    B

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

    C

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