LIGHTING SYSTEM, Diagnostic DTC:B243B, B243C

DTC Code DTC Name
B243B LED Wiring for High Beam LH Circuit
B243C LED Wiring for High Beam RH Circuit

DESCRIPTION

If a headlight unit high beam output abnormal signal from the headlight unit is detected by the headlight ECU sub-assembly LH, DTC B243B or B243C are stored.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B243B LED Wiring for High Beam LH Circuit Wiring for high beam LH circuit has a malfunction

  • Headlight unit LH

  • Headlight unit assembly LH

  • Headlight ECU sub-assembly LH

 for Triple Beam Headlight
B243C LED Wiring for High Beam RH Circuit Wiring for high beam RH circuit has a malfunction

  • Headlight unit RH

  • Headlight unit assembly RH

  • Headlight ECU sub-assembly RH

 for Triple Beam Headlight

WIRING DIAGRAM


  1. w/o Adaptive High Beam System

    B007ZCUE09

  2. w/ Adaptive High Beam System

    B007WNEE03

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


      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 high beam headlights.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B243B and B243C are not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B243B is output) B
      NG (DTC B243C 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.

      Click here

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

      Click here

    3. B007YJRC06
      *a

      Component without harness connected

      (to Headlight Unit Assembly LH)
      *b

      Component without harness connected

      (to Headlight ECU Sub-assembly LH)

      w/o Adaptive High Beam System:


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C-8 - H-2 Always Below 1 Ω
        H-1 - I-2 Always Below 1 Ω
        I-1 - J-2 Always Below 1 Ω
        C-7 - J-1 Always Below 1 Ω
    4. B007ZA3C05
      *a

      Component without harness connected

      (to Headlight Unit Assembly LH)
      *b

      Component without harness connected

      (to Headlight ECU Sub-assembly LH)

      w/ Adaptive High Beam System:


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C-8 - S-2 Always Below 1 Ω
        S-1 - E-2 Always Below 1 Ω
        C-7 - E-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT LH Click here

    OK

  4. REPLACE HEADLIGHT UNIT ASSEMBLY LH


    1. Replace the headlight unit assembly 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 > AFS > 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 high beam headlights.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B243B is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  7. INSPECT HEADLIGHT UNIT RH


    1. Remove the headlight assembly RH.

      Click here

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

      Click here

    3. B007YJRC07
      *a

      Component without harness connected

      (to Headlight Unit Assembly RH)
      *b

      Component without harness connected

      (to Headlight ECU Sub-assembly RH)

      w/o Adaptive High Beam System:


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C-8 - H-2 Always Below 1 Ω
        H-1 - I-2 Always Below 1 Ω
        I-1 - J-2 Always Below 1 Ω
        C-7 - J-1 Always Below 1 Ω
    4. B007ZA3C06
      *a

      Component without harness connected

      (to Headlight Unit Assembly RH)
      *b

      Component without harness connected

      (to Headlight ECU Sub-assembly RH)

      w/ Adaptive High Beam System:


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        C-8 - S-2 Always Below 1 Ω
        S-1 - E-2 Always Below 1 Ω
        C-7 - E-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT RH Click here

    OK

  8. REPLACE HEADLIGHT UNIT ASSEMBLY RH


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

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK FOR DTC


    1. Turn the engine switch on (IG).

    2. Operate the light control switch to turn on the high beam headlights.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B243C is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here