LIGHTING SYSTEM(w/ Automatic Headlight Beam Level Control System), Diagnostic DTC:B243D, B243E

DTC Code DTC Name
B243D Left Low Beam Fan Malfunction
B243E Right Low Beam Fan Malfunction

DESCRIPTION

The headlight ECU sub-assembly operates the low beam fan to cool the headlight LED unit in order to prevent the headlight LED unit from overheating.

Illuminates the low beam headlights and continuously operates the low beam fan.

The headlight ECU sub-assembly monitors the pulse signals from the FANP terminal when the low beam fans are operating.

Tech Tips

If B243D or B243E is output, the headlight ECU sub-assembly performs low beam headlight dimming control.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B243D Left Low Beam Fan Malfunction

    Detection condition:

  • All of the following conditions are met:


    • Ignition switch ON

    • Low beam headlights on


    Malfunction status:

  • Fan speed signals from the low beam fan of less than 2250 rpm are continuously detected*1

  • Fan speed signals from the low beam fan of less than 1600 rpm are continuously detected*2


    Malfunction duration:

  • 4 seconds or more*1

  • 120 seconds or more*2

  • Headlight LED unit assembly LH*1

  • Headlight unit LH*2

  • Headlight unit assembly LH

  • Headlight ECU sub-assembly LH

 Headlight ECU sub-assembly LH
B243E Right Low Beam Fan Malfunction

    Detection condition:

  • All of the following conditions are met:


    • Ignition switch ON

    • Low beam headlights on


    Malfunction status:

  • Fan speed signals from the low beam fan of less than 2250 rpm are continuously detected*1

  • Fan speed signals from the low beam fan of less than 1600 rpm are continuously detected*2


    Malfunction duration:

  • 4 seconds or more*1

  • 120 seconds or more*2

  • 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

    B00713GE37

  2. for LED Type Turn Signal Light

    B00713GE38

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 4*1 or 120*2 seconds or more.


      • *1: for Bulb Type Turn Signal Light

      • *2: for LED Type Turn Signal Light

    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 B243D and B243E are not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B243D is output) B
      NG (DTC B243E is output) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CONFIRM MODEL Click here

    B

  3. 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

  4. INSPECT HEADLIGHT UNIT ASSEMBLY LH

    B006Z64C01
    *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-6 (FANB) - D-3 Always Below 1 Ω
      B-15 (FANP) - D-2 Always Below 1 Ω
      B-14 (FANG) - D-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    OK

  5. INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH

    B006ZWUC01
    *a

    Component without harness connected

    (to Headlight LED Unit Assembly LH)

    1. Connect the B headlight ECU sub-assembly LH connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D-3 - D-1 Low beam headlights on 4.75 to 5.25 V
      D-2 - D-1 Low beam headlights on 4.75 to 5.25 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LED UNIT ASSEMBLY LH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  6. INSPECT HEADLIGHT UNIT ASSEMBLY LH

    B0070NQC05
    *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-6 (FANB) - C-12 Always Below 1 Ω
      B-15 (FANP) - C-11 Always Below 1 Ω
      B-14 (FANG) - C-4 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    OK

  7. INSPECT HEADLIGHT ECU SUB-ASSEMBLY LH

    B006X7PC02
    *a

    Component without harness connected

    (to Headlight Unit LH)

    1. Connect the B headlight ECU sub-assembly LH connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      C-12 - C-4 Low beam headlights on 4.75 to 5.25 V
      C-11 - C-4 Low beam headlights on 4.75 to 5.25 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT UNIT LH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  8. 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

  9. INSPECT HEADLIGHT UNIT ASSEMBLY RH

    B006Z64C01
    *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-6 (FANB) - D-3 Always Below 1 Ω
      B-15 (FANP) - D-2 Always Below 1 Ω
      B-14 (FANG) - D-1 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    OK

  10. INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH

    B006ZWUC01
    *a

    Component without harness connected

    (to Headlight LED Unit Assembly RH)

    1. Connect the B headlight ECU sub-assembly RH connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      D-3 - D-1 Low beam headlights on 4.75 to 5.25 V
      D-2 - D-1 Low beam headlights on 4.75 to 5.25 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LED UNIT ASSEMBLY RH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

  11. INSPECT HEADLIGHT UNIT ASSEMBLY RH

    B0070NQC05
    *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-6 (FANB) - C-12 Always Below 1 Ω
      B-15 (FANP) - C-11 Always Below 1 Ω
      B-14 (FANG) - C-4 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    OK

  12. INSPECT HEADLIGHT ECU SUB-ASSEMBLY RH

    B006X7PC02
    *a

    Component without harness connected

    (to Headlight Unit RH)

    1. Connect the B headlight ECU sub-assembly RH connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      C-12 - C-4 Low beam headlights on 4.75 to 5.25 V
      C-11 - C-4 Low beam headlights on 4.75 to 5.25 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT UNIT RH Click here

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here