LIGHTING SYSTEM(w/ Automatic Headlight Beam Level Control System), Diagnostic DTC:B2439, B243A

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

DESCRIPTION

The headlight ECU sub-assembly LH and headlight ECU sub-assembly RH internally boost the power supply voltage to ensure a constant supplied current for the lo/hi beam LED of their respective headlight.

By monitoring the LED power supply voltage, abnormal current and malfunctions can be detected.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B2439 Headlight LH Circuit

    Detection condition:

  • All of the following conditions are met:


    • Ignition switch ON

    • Low beam headlights on


    Malfunction status:

  • Headlight LED unit assembly*1 or headlight unit*2 malfunction

  • Open/short in Lo/Hi beam circuit


    Malfunction duration:

  • 10 seconds or more

  • Headlight LED unit assembly LH*1

  • Headlight unit LH*2

  • Headlight unit assembly LH

  • Headlight ECU sub-assembly LH

 Headlight ECU sub-assembly LH
B243A Headlight RH Circuit

    Detection condition:

  • All of the following conditions are met:


    • Ignition switch ON

    • Low beam headlights on


    Malfunction status:

  • Headlight LED unit assembly*1 or headlight unit*2 malfunction

  • Open/short in Lo/Hi beam circuit


    Malfunction duration:

  • 10 seconds or more

  • Headlight LED unit assembly RH*1

  • Headlight unit RH*2

  • Headlight unit assembly RH

  • Headlight ECU sub-assembly RH

 Headlight ECU sub-assembly RH

WIRING DIAGRAM


  1. for Bulb Type Turn Signal Light

    B006XYDE32

  2. for LED Type Turn Signal Light

    B006XYDE33

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. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

    5. Clear the DTCs.


      Body Electrical > HL AutoLeveling > Clear DTCs
      Body Electrical > HL AutoLeveling (Sub) > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

    6. Check for DTCs.


      Body Electrical > HL AutoLeveling > Trouble Codes
      Body Electrical > HL AutoLeveling (Sub) > 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

    CHECK HEADLIGHT UNIT ASSEMBLY RH Click here

    B

  3. CHECK HEADLIGHT UNIT ASSEMBLY LH


    1. Interchange the headlight unit assembly LH with RH and connect the connectors.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

    5. Clear the DTCs.


      Body Electrical > HL AutoLeveling > Clear DTCs
      Body Electrical > HL AutoLeveling (Sub) > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  5. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

    6. Check for DTCs.


      Body Electrical > HL AutoLeveling > Trouble Codes
      Body Electrical > HL AutoLeveling (Sub) > Trouble Codes
      Result
      Result Proceed to
      DTC B2439 is output A
      DTC B243A is output B

    A

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    B

  6. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      for Bulb Type Turn Signal Light A
      for LED Type Turn Signal Light B

    B

    INSPECT HEADLIGHT UNIT ASSEMBLY LH Click here

    A

  7. INSPECT HEADLIGHT UNIT ASSEMBLY LH

    B007014C01
    *a

    Component without harness connected

    (to Headlight ECU Sub-assembly LH)

    		 *b

    Component without harness connected

    (to Headlight LED Unit Assembly LH)

    1. Remove the headlight assembly LH.

      Click here

    2. Remove the headlight LED unit assembly LH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B-4 (LOLED2) - C-2 Always Below 1 Ω
      B-3 (LOLED0) - C-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LED UNIT ASSEMBLY LH Click here

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

  8. INSPECT HEADLIGHT UNIT ASSEMBLY LH

    B0070NQC04
    *a

    Component without harness connected

    (to 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.

      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

    OK

    REPLACE HEADLIGHT UNIT LH Click here

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

  9. CHECK HEADLIGHT UNIT ASSEMBLY RH


    1. Interchange the headlight unit assembly RH with LH and connect the connectors.

      for Bulb Type Turn Signal Light: Click here

      for LED Type Turn Signal Light: Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

    5. Clear the DTCs.


      Body Electrical > HL AutoLeveling > Clear DTCs
      Body Electrical > HL AutoLeveling (Sub) > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.

    6. Check for DTCs.


      Body Electrical > HL AutoLeveling > Trouble Codes
      Body Electrical > HL AutoLeveling (Sub) > Trouble Codes
      Result
      Result Proceed to
      DTC B243A is output A
      DTC B2439 is output B

    A

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    B

  12. CONFIRM MODEL


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      for Bulb Type Turn Signal Light A
      for LED Type Turn Signal Light B

    B

    INSPECT HEADLIGHT UNIT ASSEMBLY RH Click here

    A

  13. INSPECT HEADLIGHT UNIT ASSEMBLY RH

    B007014C01
    *a

    Component without harness connected

    (to Headlight ECU Sub-assembly RH)

    		 *b

    Component without harness connected

    (to Headlight LED Unit Assembly RH)

    1. Remove the headlight assembly RH.

      Click here

    2. Remove the headlight LED unit assembly RH.

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B-4 (LOLED2) - C-2 Always Below 1 Ω
      B-3 (LOLED0) - C-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LED UNIT ASSEMBLY RH Click here

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

  14. INSPECT HEADLIGHT UNIT ASSEMBLY RH

    B0070NQC04
    *a

    Component without harness connected

    (to 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.

      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

    OK

    REPLACE HEADLIGHT UNIT RH Click here

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here