LIGHTING SYSTEM, Diagnostic DTC:B2439, B243A

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

DESCRIPTION

A DTC is stored when the No. 1 headlight ECU sub-assembly receives a light source malfunction signal from its respective headlight unit. The No. 1 headlight ECU sub-assembly LH stores DTC B2439 or B243A.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2439 Headlamp LH Circuit Headlight unit LH light source malfunction

  • Headlight unit assembly LH

  • Headlight unit LH

  • No. 1 headlight ECU sub-assembly LH

 -
B243A Headlamp RH Circuit Headlight unit RH light source malfunction

  • Headlight unit assembly RH

  • Headlight unit RH

  • No. 1 headlight ECU sub-assembly RH

 -

WIRING DIAGRAM

A01VBA9E16

CAUTION / NOTICE / HINT

Note

If the No. 1 headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the No. 1 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.

    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

    INSPECT HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  3. INSPECT HEADLIGHT UNIT ASSEMBLY LH


    1. Remove the headlight assembly LH.

      Click here

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

      Click here

    3. Inspect the headlight unit assembly LH.


      1. B004OF9C34
        *a

        Component without harness connected

        (to Headlight Unit LH)
        *b

        Component without harness connected

        (to No. 1 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-4 (LOLED2) - C-5 Always Below 1 Ω
        B-5 (LOLED1) - C-6 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    OK

  4. INSPECT HEADLIGHT UNIT LH (LOW BEAM HEADLIGHT)


    1. Reconnect the C headlight unit LH connector.

    2. A01VCZZC10
      *a

      Component without harness connected

      (to No. 1 Headlight ECU Sub-assembly LH)

      Apply auxiliary battery voltage to the headlight unit LH and check that the light comes on.

      OK
      Condition Specified Condition

      Auxiliary battery positive (+) → B-4 (LOLED2)

      Auxiliary battery negative (-) → B-5 (LOLED1)

      		 Low beam comes on
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT LH Click here

    OK

  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.

    3. Check for DTCs.

      Click here


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

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  7. INSPECT HEADLIGHT UNIT ASSEMBLY RH


    1. Remove the headlight assembly RH.

      Click here

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

      Click here

    3. Inspect the headlight unit assembly RH.


      1. B004OF9C34
        *a

        Component without harness connected

        (to Headlight Unit RH)
        *b

        Component without harness connected

        (to No. 1 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-4 (LOLED2) - C-5 Always Below 1 Ω
        B-5 (LOLED1) - C-6 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    OK

  8. INSPECT HEADLIGHT UNIT RH (LOW BEAM HEADLIGHT)


    1. Reconnect the C headlight unit RH connector.

    2. A01VCZZC10
      *a

      Component without harness connected

      (to No. 1 Headlight ECU Sub-assembly RH)

      Apply auxiliary battery voltage to the headlight unit RH and check that the light comes on.

      OK
      Condition Specified Condition

      Auxiliary battery positive (+) → B-4 (LOLED2)

      Auxiliary battery negative (-) → B-5 (LOLED1)

      		 Low beam comes on
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT RH Click here

    OK

  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.

    3. Check for DTCs.

      Click here


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

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH Click here