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 control computer assembly, DTC B243B and B243C are stored.

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

  • Headlight unit LH (w/o Canister Pump Module)

  • Headlight unit assembly LH

  • Headlight control computer assembly LH
B243C LED Wiring for High Beam RH Circuit Wiring for high beam RH circuit has a malfunction

  • Headlight unit RH (w/o Canister Pump Module)

  • Headlight unit assembly RH

  • Headlight control computer assembly RH

WIRING DIAGRAM


  1. for w/o Adaptive High Beam System

    B002D0GE12

  2. for w/ Adaptive High Beam System

    B002CG5E03

CAUTION / NOTICE / HINT

Note

If the headlight control computer assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight control computer 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) (w/o Canister Pump Module) B
      NG (DTC B243C is output) (w/o Canister Pump Module) C
      NG (DTC B243B is output) (w/ Canister Pump Module) D
      NG (DTC B243C is output) (w/ Canister Pump Module) E

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    INSPECT HEADLIGHT UNIT RH Click here

    D

    REPLACE HEADLIGHT UNIT LH Click here

    E

    REPLACE 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. B002C6MC04
      *a

      Component without harness connected

      (to Headlight Unit Side Connector)
      *b

      Component without harness connected

      (to Headlight Light Control ECU Sub-assembly LH Side Connector)

      for without 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. B002E6RC03
      *a

      Component without harness connected

      (to Headlight Unit Side Connector)
      *b

      Component without harness connected

      (to Headlight Light Control ECU Sub-assembly LH Side Connector)

      for with 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 CONTROL COMPUTER 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. B002C6MC04
      *a

      Component without harness connected

      (to Headlight Unit Side Connector)
      *b

      Component without harness connected

      (to Headlight Light Control ECU Sub-assembly RH Side Connector)

      for without 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. B002E6RC03
      *a

      Component without harness connected

      (to Headlight Unit Side Connector)
      *b

      Component without harness connected

      (to Headlight Light Control ECU Sub-assembly RH Side Connector)

      for with 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 CONTROL COMPUTER ASSEMBLY RH Click here

  11. REPLACE HEADLIGHT UNIT LH


    1. Replace the headlight unit LH 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 > AFS > 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 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 LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT CONTROL COMPUTER ASSEMBLY LH Click here

  14. REPLACE HEADLIGHT UNIT RH


    1. Replace the headlight unit 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 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 RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT CONTROL COMPUTER ASSEMBLY RH Click here