AUTOMATIC HEADLIGHT BEAM LEVEL CONTROL SYSTEM, Diagnostic DTC:B2424, B2425

DTC Code DTC Name
B2424 Headlight Leveling Motor LH Communication Malfunction
B2425 Headlight Leveling Motor RH Communication Malfunction

DESCRIPTION

The headlight ECU sub-assembly receives a signal from each headlight leveling motor using LIN communication.

DTC Code DTC Detection Condition Trouble Area
B2424

  • Malfunction in headlight leveling motor LH

  • Open or short in headlight leveling motor LH communication circuit

  • Headlight unit LH

  • Headlight leveling motor LH

  • Headlight ECU sub-assembly LH
B2425

  • Malfunction in headlight leveling motor RH

  • Open or short in headlight leveling motor RH communication circuit

  • Headlight unit RH

  • Headlight leveling motor RH

  • Headlight ECU sub-assembly LH

  • Headlight ECU sub-assembly RH

WIRING DIAGRAM


  1. for Triple Beam Headlight

    B002C2AE27

  2. for Single Beam Headlight

    B002C2AE28

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.


    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2424 and B2425 are not output.
      Result
      Result Proceed to
      OK A
      NG (DTC B2424 is output) B
      NG (DTC B2425 is output) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH) Click here

    B

  3. INSPECT HEADLIGHT UNIT LH


    1. Remove the headlight unit LH.


    2. Remove the headlight ECU sub-assembly LH Click here.

    3. B002BBNE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Leveling Motor LH)
      *b

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly LH)

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

      Standard Resistance
      for Triple Beam Headlight
      Tester Connection Condition Specified Condition
      C-13 - O-3 Always Below 1 Ω
      for Single Beam Headlight
      Tester Connection Condition Specified Condition
      C-13 - O-4 Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (for Triple Beam Headlight) B
      NG (for Single Beam Headlight) C

    B

    REPLACE HEADLIGHT UNIT LH Click here

    C

    REPLACE HEADLIGHT UNIT LH Click here

    A

  4. REPLACE HEADLIGHT LEVELING MOTOR LH


    1. Replace the headlight leveling motor LH with a new or known good one.



    NEXT

  5. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2424 is not output.

    OK

    END (HEADLIGHT LEVELING MOTOR LH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - HEADLIGHT ECU SUB-ASSEMBLY RH)


    1. Disconnect the B16 headlight ECU sub-assembly LH connector.

    2. Disconnect the B15 headlight ECU sub-assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B16-20 (LINL) - B15-20 (LINL) Always Below 1 Ω
      B16-20 (LINL) or B15-20 (LINL) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT HEADLIGHT UNIT ASSEMBLY RH


    1. Remove the headlight unit RH.


    2. Remove the headlight ECU sub-assembly RH Click here.

    3. B002BBNE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Leveling Motor RH)
      *b

      Front view of wire harness connector

      (to Headlight ECU Sub-assembly RH)

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

      Standard Resistance
      for Triple Beam Headlight
      Tester Connection Condition Specified Condition
      C-13 - O-3 Always Below 1 Ω
      for Single Beam Headlight
      Tester Connection Condition Specified Condition
      C-13 - O-4 Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (for Triple Beam Headlight) B
      NG (for Single Beam Headlight) C

    B

    REPLACE HEADLIGHT UNIT RH Click here

    C

    REPLACE HEADLIGHT UNIT RH Click here

    A

  9. REPLACE HEADLIGHT LEVELING MOTOR RH


    1. Replace the headlight leveling motor RH with a new or known good one.



    NEXT

  10. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  11. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2425 is not output.

    OK

    END (HEADLIGHT LEVELING MOTOR RH WAS DEFECTIVE)

    NG

  12. REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH


    1. Replace the headlight ECU sub-assembly RH with a new or known good one Click here.


    NEXT

  13. CLEAR DTC


    1. Clear the DTCs Click here.


    NEXT

  14. CHECK FOR DTC


    1. Check for DTCs Click here.

      OK
      DTC B2425 is not output.

    OK

    END (HEADLIGHT ECU SUB-ASSEMBLY RH WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here