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 and B243A.

DTC No. Detection Item DTC Detection Condition Trouble Area Note
B2439 Headlamp LH Circuit No. 1 headlight ECU sub-assembly LH light source malfunction

  • Headlight unit assembly LH

  • Headlight unit LH

  • No. 1 headlight ECU sub-assembly LH

 -
B243A Headlamp RH Circuit No. 1 headlight ECU sub-assembly RH light source malfunction

  • Headlight unit assembly RH

  • Headlight unit RH

  • No. 1 headlight ECU sub-assembly RH

 -

WIRING DIAGRAM


  1. w/o Adaptive High Beam System

    A003OL8E11

  2. w/ Adaptive High Beam System

    A003OL8E12

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. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling*1 or AHS*2 / Trouble Codes.


      • *1: w/o Adaptive High Beam System

      • *2: w/ Adaptive High Beam System

    5. Clear the DTCs.


      Body Electrical > HL AutoLeveling > Clear DTCs
      Body Electrical > AHS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Operate the light control switch to turn on the low beam headlights.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / HL AutoLeveling*1 or AHS*2 / Trouble Codes.


      • *1: w/o Adaptive High Beam System

      • *2: w/ Adaptive High Beam System

    6. Check for DTCs.


      Body Electrical > HL AutoLeveling > Trouble Codes
      Body Electrical > AHS > 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

    A003MX4C06
    *A w/o Adaptive High Beam System *B w/ Adaptive High Beam System
    *a

    Component without harness connected

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

    		 *b

    Component without harness connected

    (to Headlight Unit LH)

    1. Remove the headlight assembly LH.

      Click here

    2. Remove the headlight unit LH.

      Click here

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


      1. w/o Adaptive High Beam System

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-4 (LOLED2) - D-6 Always Below 1 Ω
        B-5 (LOLED1) - D-5 Always Below 1 Ω

      2. w/ Adaptive High Beam System

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-4 (LOLED2) - D-6 Always Below 1 Ω
        B-3 (LOLED0) - D-5 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. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling*1 or AHS*2 / Trouble Codes.


      • *1: w/o Adaptive High Beam System

      • *2: w/ Adaptive High Beam System

    5. Clear the DTCs.


      Body Electrical > HL AutoLeveling > Clear DTCs
      Body Electrical > AHS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Operate the light control switch to turn on the low beam headlights.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / HL AutoLeveling*1 or AHS*2 / Trouble Codes.


      • *1: w/o Adaptive High Beam System

      • *2: w/ Adaptive High Beam System

    6. Check for DTCs.


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

    OK

    END (HEADLIGHT UNIT LH WAS DEFECTIVE)

    NG

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

  7. INSPECT HEADLIGHT UNIT ASSEMBLY RH

    A003MX4C06
    *A w/o Adaptive High Beam System *B w/ Adaptive High Beam System
    *a

    Component without harness connected

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

    		 *b

    Component without harness connected

    (to Headlight Unit RH)

    1. Remove the headlight assembly RH.

      Click here

    2. Remove the headlight unit RH.

      Click here

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


      1. w/o Adaptive High Beam System

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-4 (LOLED2) - D-6 Always Below 1 Ω
        B-5 (LOLED1) - D-5 Always Below 1 Ω

      2. w/ Adaptive High Beam System

        Standard Resistance
        Tester Connection Condition Specified Condition
        B-4 (LOLED2) - D-6 Always Below 1 Ω
        B-3 (LOLED0) - D-5 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. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling*1 or AHS*2 / Trouble Codes.


      • *1: w/o Adaptive High Beam System

      • *2: w/ Adaptive High Beam System

    5. Clear the DTCs.


      Body Electrical > HL AutoLeveling > Clear DTCs
      Body Electrical > AHS > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Operate the light control switch to turn on the low beam headlights.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / HL AutoLeveling*1 or AHS*2 / Trouble Codes.


      • *1: w/o Adaptive High Beam System

      • *2: w/ Adaptive High Beam System

    6. Check for DTCs.


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

    OK

    END (HEADLIGHT UNIT RH WAS DEFECTIVE)

    NG

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