LIGHTING SYSTEM(for Triple Beam Headlight), Diagnostic DTC:B2439, B243A

DTC Code DTC Name
B2439 Headlamp LH Circuit
B243A Headlamp RH Circuit

DESCRIPTION

A DTC is stored when the headlight ECU sub-assembly LH or RH receives a light source malfunction signal from its respective headlight unit. The headlight ECU sub-assembly LH stores DTC B2439 and B243A.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2439 Headlamp LH Circuit Headlight ECU sub-assembly LH light source malfunction

  • Headlight unit assembly LH

  • Headlight unit LH

  • Headlight ECU sub-assembly LH
B243A Headlamp RH Circuit Headlight ECU sub-assembly RH light source malfunction

  • Headlight unit assembly RH

  • Headlight unit RH

  • Headlight ECU sub-assembly RH

WIRING DIAGRAM

B004G80E10

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 > HL AutoLeveling > Clear DTCs
      Result
      Proceed to
      NEXT

    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 then turn on the high beam headlights.

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      OK
      DTC B2439 and B243A are not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B2439 is output) B
      NG (DTC B243A is output) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  3. REPLACE HEADLIGHT UNIT ASSEMBLY LH


    1. Remove the headlight assembly LH.

      Click here

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

      Click here

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

      B004G0QC01
      *a

      Component without harness connected

      (Headlight Unit LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-1 - E-8 Always Below 1 Ω
      A-2 - B-1 Always Below 1 Ω
      B-2 - C-1 Always Below 1 Ω
      C-2 - E-7 Always Below 1 Ω
      D-1 - F-4 Always Below 1 Ω
      D-2 - F-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    OK

  4. REPLACE HEADLIGHT UNIT LH


    1. Replace the headlight unit 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 power switch on (IG).

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

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      OK
      DTC B2439 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  7. REPLACE HEADLIGHT UNIT ASSEMBLY RH


    1. Remove the headlight assembly RH.

      Click here

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

      Click here

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

      B004FN5C01
      *a

      Component without harness connected

      (Headlight Unit Assembly RH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-1 - E-8 Always Below 1 Ω
      A-2 - B-1 Always Below 1 Ω
      B-2 - C-1 Always Below 1 Ω
      C-2 - E-7 Always Below 1 Ω
      D-1 - F-4 Always Below 1 Ω
      D-2 - F-3 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    OK

  8. REPLACE HEADLIGHT UNIT RH


    1. Replace the headlight unit 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 > HL AutoLeveling > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK FOR DTC


    1. Turn the power switch on (IG).

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

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      OK
      DTC B243A is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here