LIGHTING SYSTEM, Diagnostic DTC:B243D, B243E

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

DESCRIPTION

A DTC is stored when a malfunction of the headlight fan occurs and the low beam headlight is dim. The headlight ECU sub-assembly LH stores DTC B243D or B243E.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B243D Left Low Beam Fan Malfunction Malfunction of headlight fan occurs and low beam headlight LH is dim

    for Single Beam Headlight:

  • Headlight unit LH

  • Headlight unit assembly LH (headlight fan LH)

  • Headlight ECU sub-assembly LH


    for Triple Beam Headlight:

  • Headlight unit LH

  • Headlight fan LH

  • Headlight ECU sub-assembly LH

 -
B243E Right Low Beam Fan Malfunction Malfunction of headlight fan occurs and low beam headlight RH is dim

    for Single Beam Headlight:

  • Headlight unit RH

  • Headlight unit assembly RH (headlight fan RH)

  • Headlight ECU sub-assembly RH


    for Triple Beam Headlight:

  • Headlight unit RH

  • Headlight fan RH

  • Headlight ECU sub-assembly RH

 -

WIRING DIAGRAM


  1. for Single Beam Headlight

    B005MZSE13

  2. for Triple Beam Headlight

    B005MZSE14
    *a Headlight Fan
    *b Headlight Unit
    *c Headlight ECU Sub-assembly

CAUTION / NOTICE / HINT

Note

If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

Click here

PROCEDURE


  1. CLEAR DTC


    1. for Single Beam Headlight:


      1. Clear the DTCs.

        Click here


        Body Electrical > HL AutoLeveling > Clear DTCs

    2. for Triple Beam Headlight:


      1. Clear the DTCs.

        Click here


        Body Electrical > AFS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Turn the engine switch on (IG).

    2. Operate the light control switch to turn on the low beam headlights and wait 2 minutes.

    3. for Single Beam Headlight:


      1. Check for DTCs.

        Click here


        Body Electrical > HL AutoLeveling > Trouble Codes
        OK
        DTC B243D and B243E are not output.

    4. for Triple Beam Headlight:


      1. Check for DTCs.

        Click here


        Body Electrical > AFS > Trouble Codes
        OK
        DTC B243D and B243E are not output.
      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 RH Click here

    B

  3. INSPECT HEADLIGHT UNIT LH


    1. Remove the headlight assembly LH.

      for Single Beam Headlight: Click here

      for Triple Beam Headlight: Click here

    2. Remove the headlight unit assembly LH from the headlight assembly LH.

      for Single Beam Headlight: Click here

      for Triple Beam Headlight: Click here

    3. for Single Beam Headlight:


      1. B005M1TC10
        *a

        Component without harness connected

        (to Headlight Unit Assembly LH (Headlight Fan LH))
        *b

        Component without harness connected

        (to Headlight ECU Sub-assembly LH)

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-6 - D-12 Always Below 1 Ω
        B-15 - D-11 Always Below 1 Ω
        B-14 - D-4 Always Below 1 Ω

    4. for Triple Beam Headlight:


      1. Disconnect the headlight fan LH connector.

      2. B005PKZC05
        *a

        Component without harness connected

        (to Headlight Fan LH)
        *b

        Component without harness connected

        (to Headlight ECU Sub-assembly LH)

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-6 - F-1 Always Below 1 Ω
        B-15 - F-3 Always Below 1 Ω
        B-14 - F-2 Always Below 1 Ω
      Result
      Result Proceed to
      OK (for Single Beam Headlight) A
      OK (for Triple Beam Headlight) B
      NG C

    B

    REPLACE HEADLIGHT FAN LH Click here

    C

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

    A

  4. REPLACE HEADLIGHT UNIT ASSEMBLY LH (HEADLIGHT FAN LH)


    1. Replace the headlight unit assembly LH (headlight fan LH) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  5. CLEAR DTC


    1. Clear the DTCs.

      Click here


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

    NEXT

  6. CHECK FOR DTC


    1. Turn the engine switch on (IG).

    2. Operate the light control switch to turn on the low beam headlights and wait 2 minutes.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      OK
      DTC B243D is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY LH (HEADLIGHT FAN LH) WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  7. REPLACE HEADLIGHT FAN LH


    1. Replace the headlight fan LH with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK FOR DTC


    1. Turn the engine switch on (IG).

    2. Operate the light control switch to turn on the low beam headlights and wait 2 minutes.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B243D is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT FAN LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  10. INSPECT HEADLIGHT UNIT RH


    1. Remove the headlight assembly RH.

      for Single Beam Headlight: Click here

      for Triple Beam Headlight: Click here

    2. Remove the headlight unit assembly RH from the headlight assembly RH.

      for Single Beam Headlight: Click here

      for Triple Beam Headlight: Click here

    3. for Single Beam Headlight:


      1. B005M1TC11
        *a

        Component without harness connected

        (to Headlight Unit Assembly RH (Headlight Fan RH))
        *b

        Component without harness connected

        (to Headlight ECU Sub-assembly RH)

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-6 - D-12 Always Below 1 Ω
        B-15 - D-11 Always Below 1 Ω
        B-14 - D-4 Always Below 1 Ω

    4. for Triple Beam Headlight:


      1. B005PKZC06
        *a

        Component without harness connected

        (to Headlight Fan RH)
        *b

        Component without harness connected

        (to Headlight ECU Sub-assembly RH)

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-6 - F-1 Always Below 1 Ω
        B-15 - F-3 Always Below 1 Ω
        B-14 - F-2 Always Below 1 Ω
      Result
      Result Proceed to
      OK (for Single Beam Headlight) A
      OK (for Triple Beam Headlight) B
      NG C

    B

    REPLACE HEADLIGHT FAN RH Click here

    C

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

    A

  11. REPLACE HEADLIGHT UNIT ASSEMBLY RH (HEADLIGHT FAN RH)


    1. Replace the headlight unit assembly RH (headlight fan RH) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  12. CLEAR DTC


    1. Clear the DTCs.

      Click here


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

    NEXT

  13. CHECK FOR DTC


    1. Turn the engine switch on (IG).

    2. Operate the light control switch to turn on the low beam headlights and wait 2 minutes.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      OK
      DTC B243E is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY RH (HEADLIGHT FAN RH) WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

  14. REPLACE HEADLIGHT FAN RH


    1. Replace the headlight fan RH with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  15. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  16. CHECK FOR DTC


    1. Turn the engine switch on (IG).

    2. Operate the light control switch to turn on the low beam headlights and wait 2 minutes.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B243D is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT FAN RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here