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 and B243E.

DTC Code DTC Detection Condition Trouble Area
B243D Malfunction of headlight fan occurs and low beam headlight is dim

    for Single Beam Headlight:

  • Headlight unit assembly LH

  • Headlight unit LH

  • Headlight ECU sub-assembly LH


    for Triple Beam Headlight:

  • Headlight unit assembly LH

  • Headlight fan LH

  • Headlight ECU sub-assembly LH
B243E Malfunction of headlight fan occurs and low beam headlight is dim

    for Single Beam Headlight:

  • Headlight unit assembly RH

  • Headlight unit RH

  • Headlight ECU sub-assembly RH


    for Triple Beam Headlight:

  • Headlight unit assembly RH

  • Headlight fan RH

  • Headlight ECU sub-assembly RH

WIRING DIAGRAM


  1. for Single Beam Headlight with AFS (Adaptive Front-lighting System)

    B002BAVE21

  2. for Single Beam Headlight without AFS (Adaptive Front-lighting System)

    B002BAVE22

  3. for Triple Beam Headlight

    B002BAVE23
    *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. Clear the DTCs Click here.


    NEXT

  2. CHECK FOR DTC


    1. Turn the power 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.

      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 ASSEMBLY RH Click here

    B

  3. INSPECT HEADLIGHT UNIT LH


    1. for Single Beam Headlight:

      B002BQNE02
      Text in Illustration
      *A without AFS (Adaptive Front-lighting System) *B with AFS (Adaptive Front-lighting System)
      *a

      Component without harness connected

      (to Headlight Unit Assembly LH)

      		 *b

      Component without harness connected

      (to Headlight ECU Sub-assembly LH)

      1. Remove the headlight unit LH Click here.

      2. Remove the headlight assembly LH Click here.

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

        Standard Resistance
        without AFS (Adaptive Front-lighting System)
        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
        with AFS (Adaptive Front-lighting System)
        Tester Connection Condition Specified Condition
        B-6 - D-8 Always Below 1 Ω
        B-15 - D-7 Always Below 1 Ω
        B-14 - D-2 Always Below 1 Ω
    2. B002BUPE02
      Text in Illustration
      *a

      Component without harness connected

      (to Headlight Fan LH)
      *b

      Component without harness connected

      (to Headlight ECU Sub-assembly LH)

      for Triple Beam Headlight:


      1. Remove the headlight unit LH Click here.

      2. Disconnect the headlight fan LH connector.

      3. 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 (for Single Beam Headlight) C
      NG (for Triple Beam Headlight) D

    B

    REPLACE HEADLIGHT FAN LH Click here

    C

    REPLACE HEADLIGHT UNIT LH Click here

    D

    REPLACE HEADLIGHT UNIT LH Click here

    A

  4. REPLACE HEADLIGHT UNIT ASSEMBLY LH


    1. Replace the headlight unit assembly LH with a new or known good one Click here.


    NEXT

  5. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  6. CHECK FOR DTC


    1. Turn the power 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.

      OK
      DTC B243D is not output.

    OK

    END (HEADLIGHT UNIT ASSEMBLY 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.


    NEXT

  8. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  9. CHECK FOR DTC


    1. Turn the power 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.

      OK
      DTC B243D is not output.

    OK

    END (HEADLIGHT FAN LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  10. INSPECT HEADLIGHT UNIT ASSEMBLY RH


    1. for Single Beam Headlight:

      B002BQNE02
      Text in Illustration
      *A without AFS (Adaptive Front-lighting System) *B with AFS (Adaptive Front-lighting System)
      *a

      Component without harness connected

      (to Headlight Unit Assembly RH)

      		 *b

      Component without harness connected

      (to Headlight ECU Sub-assembly RH)

      1. Remove the headlight unit RH Click here.

      2. Remove the headlight assembly RH Click here.

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

        Standard Resistance
        without AFS (Adaptive Front-lighting System)
        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
        with AFS (Adaptive Front-lighting System)
        Tester Connection Condition Specified Condition
        B-6 - D-8 Always Below 1 Ω
        B-15 - D-7 Always Below 1 Ω
        B-14 - D-2 Always Below 1 Ω
    2. B002BUPE02
      Text in Illustration
      *a

      Component without harness connected

      (to Headlight Fan RH)
      *b

      Component without harness connected

      (to Headlight ECU Sub-assembly RH)

      for Triple Beam Headlight:


      1. Remove the headlight unit RH Click here.

      2. Disconnect the headlight fan RH connector.

      3. 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 (for Single Beam Headlight) C
      NG (for Triple Beam Headlight) D

    B

    REPLACE HEADLIGHT FAN RH Click here

    C

    REPLACE HEADLIGHT UNIT RH Click here

    D

    REPLACE HEADLIGHT UNIT RH Click here

    A

  11. REPLACE HEADLIGHT UNIT ASSEMBLY RH


    1. Replace the headlight unit assembly RH with a new or known good one Click here.


    NEXT

  12. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  13. CHECK FOR DTC


    1. Turn the power 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.

      OK
      DTC B243D is not output.

    OK

    END (HEADLIGHT UNIT ASSEMBLY 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.


    NEXT

  15. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  16. CHECK FOR DTC


    1. Turn the power 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.

      OK
      DTC B243D is not output.

    OK

    END (HEADLIGHT FAN RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here