LIGHTING SYSTEM, Diagnostic DTC:B2439, B243A

DTC Code DTC Name
B2439 Headlamp LH Circuit
B243A Headlamp RH Circuit

DESCRIPTION

This DTC is output when the headlight ECU sub-assembly receives an abnormal signal from the headlight unit.

The headlight ECU sub-assembly LH outputs DTC B2439 and B243A

DTC No. Detection Item DTC Detection Condition Trouble Area
B2439 Headlamp LH Circuit Headlight ECU sub-assembly LH light source malfunction

  • Headlight ECU sub-assembly LH

  • Headlight unit LH

  • Headlight unit assembly LH
B243A Headlamp RH Circuit Headlight ECU sub-assembly RH light source malfunction

  • Headlight ECU sub-assembly RH

  • Headlight unit RH

  • Headlight unit assembly RH

WIRING DIAGRAM


  1. for Triple Beam Headlight:

    B002JC0E02

  2. for Single Beam Headlight:

    B002JGBE03

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. 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 B2439 or B243A output does not occur.
      Result
      Result Proceed to
      OK A
      NG (DTC B2439 is output) B
      NG (DTC B243A is output) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  2. CHECK HEADLIGHT UNIT ASSEMBLY LH


    1. Interchange the headlight unit assembly LH with RH and connect the connectors to them.

      for Single Beam Headlight:

      Click here

      for Triple Beam Headlight:

      Click here

    2. Clear the DTCs.

      Click here

      for Single Beam Headlight:


      Body Electrical > HL AutoLeveling > Clear DTCs

      for Triple Beam Headlight:


      Body Electrical > AFS > Clear DTCs

    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
      Result
      Result Proceed to
      DTC B2439 is output A
      DTC B243A is output B

    A

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    B

  3. INSPECT HEADLIGHT UNIT ASSEMBLY LH


    1. for Triple Beam Headlight:


      1. B002IH6C02
        *a

        Component without harness connected

        (Headlight ECU Sub-assembly LH)
        *b

        Component without harness connected

        (Headlight Unit LH)

        Remove the headlight unit LH.

        Click here

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-3 - D-1 Always Below 1 Ω
        B-2 - D-2 Always Below 1 Ω

    2. for Single Beam Headlight:


      1. B002IFCC02
        *a

        Component without harness connected

        (Headlight ECU Sub-assembly LH)
        *b

        Component without harness connected

        (Headlight Unit LH)

        Remove the headlight unit LH.

        Click here

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-4 - C-5 Always Below 1 Ω
        B-5 - C-6 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT UNIT LH for Triple Beam Headlight: REPLACE HEADLIGHT UNIT LH Click here
    REPLACE HEADLIGHT UNIT LH for Single Beam Headlight: REPLACE HEADLIGHT UNIT LH Click here

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH for Triple Beam Headlight: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here
    REPLACE HEADLIGHT UNIT ASSEMBLY LH for Single Beam Headlight: REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

  4. CHECK HEADLIGHT UNIT ASSEMBLY RH


    1. Interchange the headlight unit assembly RH with LH and connect the connectors to them.

      for Single Beam Headlight:

      Click here

      for Triple Beam Headlight:

      Click here

    2. Clear the DTCs.

      Click here

      for Single Beam Headlight:


      Body Electrical > HL AutoLeveling > Clear DTCs

      for Triple Beam Headlight:


      Body Electrical > AFS > Clear DTCs

    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
      Result
      Result Proceed to
      DTC B243A is output A
      DTC B2439 is output B

    A

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    B

  5. INSPECT HEADLIGHT UNIT ASSEMBLY RH


    1. for Triple Beam Headlight:


      1. B002IH6C02
        *a

        Component without harness connected

        (Headlight ECU Sub-assembly RH)
        *b

        Component without harness connected

        (Headlight Unit RH)

        Remove the headlight unit RH.

        Click here

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-3 - D-1 Always Below 1 Ω
        B-2 - D-2 Always Below 1 Ω

    2. for Single Beam Headlight:


      1. B002IFCC02
        *a

        Component without harness connected

        (Headlight ECU Sub-assembly RH)
        *b

        Component without harness connected

        (Headlight Unit RH)

        Remove the headlight unit RH.

        Click here

      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-4 - C-5 Always Below 1 Ω
        B-5 - C-6 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT UNIT RH for Triple Beam Headlight: REPLACE HEADLIGHT UNIT RH Click here
    REPLACE HEADLIGHT UNIT RH for Single Beam Headlight: REPLACE HEADLIGHT UNIT RH Click here

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH for Triple Beam Headlight: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here
    REPLACE HEADLIGHT UNIT ASSEMBLY RH for Single Beam Headlight: REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here