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Home >> Lexus >> 2019 >> ES 300h Base >> Repair and Diagnosis >> Accessories & Equipment >> Headlights >> Lighting System (Ext) (Hybrid) - Diagnostic Codes (2 Of 2) & Symptom Tests (1 Of 2) >> LIGHTING SYSTEM (for HV Model) >> DTC B2451: Variation Code not Written [06/2018 - ] >> Procedure

DTC B2451: Variation Code not Written [06/2018 - ]: Procedure

  1. SYNCHRONIZE VEHICLE INFORMATION 
    1. Synchronize the vehicle information.

      Refer to INITIALIZATION [06/2018 - 08/2020] , or refer to INITIALIZATION [08/2020 - 08/2021] , or refer to INITIALIZATION [08/2021 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      For LED Type Turn Signal Light A
      For Bulb Type Turn Signal Light B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  3

  3. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS / Trouble Codes.
    5. Clear the DTCs.

      Body Electrical > AFS > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. CHECK FOR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / AFS / Trouble Codes.
    5. Check for DTCs.

      Body Electrical > AFS > Trouble Codes 

      OK

      DTC B2451 is not output.

      HINT: 

      If the headlight ECU sub-assembly LH stores DTC B2451 even though the vehicle information has been synchronized, the headlight ECU sub-assembly LH may be malfunctioning.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (VEHICLE SPECIFICATIONS WERE NOT STORED) 

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [06/2018 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

  5. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
    5. Clear the DTCs.

      Body Electrical > HL AutoLeveling > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. CHECK FOR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / HL AutoLeveling / Trouble Codes.
    5. Check for DTCs.

      Body Electrical > HL AutoLeveling > Trouble Codes 

      OK

      DTC B2451 is not output.

      HINT: 

      If the headlight ECU sub-assembly LH stores DTC B2451 even though the vehicle information has been synchronized, the headlight ECU sub-assembly LH may be malfunctioning.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (VEHICLE SPECIFICATIONS WERE NOT STORED) 

    Result: 

    NG 

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [06/2018 - 09/2022]  , or refer to  REMOVAL [09/2022 - ] 

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