LIGHTING SYSTEM, Diagnostic DTC:B243D, B243E

DTC Code DTC Name
B243D Left Low Beam Fan Malfunction
B243E Right Low Beam Fan Malfunction

DESCRIPTION

This DTC is output when the low beam fan is malfunctioning and the low beam illumination is dark.

The headlight ECU sub-assembly LH outputs DTC B243D and B243E

DTC No. Detection Item DTC Detection Condition Trouble Area
B243D Left Low Beam Fan Malfunction The headlight assembly LH low beam fan is malfunctioning and the low beam illumination is dark.

  • Headlight unit LH (headlight fan LH)

  • Headlight unit assembly LH

  • Headlight ECU sub-assembly LH
B243E Right Low Beam Fan Malfunction The headlight assembly RH low beam fan is malfunctioning and the low beam illumination is dark.

  • Headlight unit RH (headlight fan RH)

  • Headlight unit assembly RH

  • Headlight ECU sub-assembly RH

WIRING DIAGRAM


  1. for Triple Beam Headlight:

    B0058UPE03

  2. for Single Beam Headlight:

    B0058UPE04

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 B243D or B243E output does not occur.
      Result
      Result Proceed to
      OK A
      NG (DTC B243D is output) B
      NG (DTC B243E is output) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    INSPECT HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  2. INSPECT HEADLIGHT UNIT ASSEMBLY LH


    1. for Triple Beam Headlight:


      1. B0058DGC02
        *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 - D-3 Always Below 1 Ω
        B-14 - D-4 Always Below 1 Ω
        B-15 - D-11 Always Below 1 Ω

    2. for Single Beam Headlight:


      1. B005A8PC02
        *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-6 - C-12 Always Below 1 Ω
        B-14 - C-4 Always Below 1 Ω
        B-15 - C-11 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    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

    OK

  3. INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH


    1. for Triple Beam Headlight:


      1. B0057L9C02
        *a

        Component without harness connected

        (Headlight Unit LH)

        Remove the headlight unit LH.

        Click here

      2. Connect the No. 1 headlight ECU sub-assembly LH connectors.

      3. Measure the voltage according to the value (s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        D-3 - D-4 Low beam headlights illuminated 4.5 to 5.5 V
        D-5 - D-4

    2. for Single Beam Headlight:


      1. B005AVXC01
        *a

        Component without harness connected

        (Headlight Unit LH)

        Remove the headlight unit LH.

        Click here

      2. Connect the No. 1 headlight ECU sub-assembly LH connectors.

      3. Measure the voltage according to the value (s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        C-12 - C-4 Low beam headlights illuminated 4.5 to 5.5 V
        C-11 -C-4
      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 ECU SUB-ASSEMBLY LH Click here

  4. INSPECT HEADLIGHT UNIT ASSEMBLY RH


    1. for Triple Beam Headlight:


      1. B0058DGC02
        *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 - D-3 Always Below 1 Ω
        B-14 - D-4 Always Below 1 Ω
        B-15 - D-11 Always Below 1 Ω

    2. for Single Beam Headlight:


      1. B005A8PC02
        *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-6 - C-12 Always Below 1 Ω
        B-14 - C-4 Always Below 1 Ω
        B-15 - C-11 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    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

    OK

  5. INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH


    1. for Triple Beam Headlight:


      1. B0057L9C02
        *a

        Component without harness connected

        (Headlight Unit RH)

        Remove the headlight unit RH.

        Click here

      2. Connect the No. 1 headlight ECU sub-assembly RH connectors.

      3. Measure the voltage according to the value (s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        D-3 - D-4 Low beam headlights illuminated 4.5 to 5.5 V
        D-5 - D-4

    2. for Single Beam Headlight:


      1. B005AVXC01
        *a

        Component without harness connected

        (Headlight Unit RH)

        Remove the headlight unit RH.

        Click here

      2. Connect the No. 1 headlight ECU sub-assembly RH connectors.

      3. Measure the voltage according to the value (s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        C-12 - C-4 Low beam headlights illuminated 4.5 to 5.5 V
        C-11 -C-4
      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 ECU SUB-ASSEMBLY RH Click here