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
B2456 Left Headlight ECU Variation Error Headlight ECU sub-assembly LH variation mismatch

  • Headlight ECU sub-assembly LH

  • ECM

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here

      for Single Beam Headlight:


      Body Electrical > HL AutoLeveling > Clear DTCs

      for Triple Beam Headlight:


      Body Electrical > AFS > Clear DTCs

    2. Turn the engine switch on (IG).

    3. Check for DTCs.

      Click here

      for Single Beam Headlight:


      Body Electrical > HL AutoLeveling > Trouble Codes

      for Triple Beam Headlight:


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2456 output does not occur.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  2. 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 B

    A

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    B

    REPLACE ECM for 3ZR-FAE: REPLACE ECM Click here
    REPLACE ECM for 8AR-FTS: REPLACE ECM Click here