LIGHTING SYSTEM(for LED Headlight), Diagnostic DTC:B2424, B2425

DTC Code DTC Name
B2424 Headlight Leveling Motor LH Communication Malfunction
B2425 Headlight Beam Level Control Motor RH Lost Communication

DESCRIPTION

The No. 1 headlight ECU sub-assembly receives a signal from each headlight leveling motor using LIN communication.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
B2424 Headlight Leveling Motor LH Communication Malfunction

Either condition is met:


  • Malfunction in headlight leveling motor LH

  • Open or short in headlight leveling motor LH communication circuit

  • Headlight leveling motor LH

  • Headlight unit LH

  • No. 1 headlight ECU sub-assembly LH

 No. 1 headlight ECU sub-assembly LH -
B2425 Headlight Beam Level Control Motor RH Lost Communication

Either condition is met:


  • Malfunction in headlight leveling motor RH

  • Open or short in headlight leveling motor RH communication circuit

  • Headlight leveling motor RH

  • Headlight unit RH

  • Harness or connector

  • No. 1 headlight ECU sub-assembly RH

  • No. 1 headlight ECU sub-assembly LH

 No. 1 headlight ECU sub-assembly LH -

WIRING DIAGRAM

B001E6NE01

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. CHECK FOR DTC


    1. Clear the DTCs.

      Click here

    2. Turn the ignition switch to ON.

    3. Check for DTCs.

      Click here

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

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HEADLIGHT UNIT LH Click here

    D

    CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH) Click here

    B

  2. CHECK HEADLIGHT ASSEMBLY RH


    1. Disconnect the A103 No. 1 headlight ECU sub-assembly RH connector.

    2. Clear the DTCs.

      Click here

    3. Turn the ignition switch to ON.

    4. Check for DTCs.

      Click here

      Result
      Result Proceed to
      Only DTC B2425 is output A
      DTC B2424 and B2425 are output B

    B

    CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH) Click here

    A

  3. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH


    1. Remove the No. 1 headlight ECU sub-assembly RH.

      Click here

    2. Connect the A103 No. 1 headlight ECU sub-assembly RH connector.

    3. Clear the DTCs.

      Click here

    4. Turn the ignition switch to ON.

    5. Check for DTCs.

      Click here

      Result
      Result Proceed to
      Only DTC B2425 is output A
      DTC B2424 and B2425 are output B

    B

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

    A

  4. CHECK HEADLIGHT LEVELING MOTOR RH


    1. Disconnect the headlight leveling motor RH connector.

    2. Connect the No. 1 headlight ECU sub-assembly RH connectors.

    3. Clear the DTCs.

      Click here

    4. Turn the ignition switch to ON.

    5. Check for DTCs.

      Click here

      Result
      Result Proceed to
      Only DTC B2425 is output A
      DTC B2424 and B2425 are output B

    A

    REPLACE HEADLIGHT LEVELING MOTOR RH Click here

    B

    REPLACE HEADLIGHT UNIT RH Click here

  5. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH)


    1. Disconnect the A102 No. 1 headlight ECU sub-assembly LH connector.

    2. Disconnect the A103 No. 1 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
      A102-20 (LINL) or A103-20 (LINL) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH


    1. Remove the No. 1 headlight ECU sub-assembly LH.

      Click here

    2. Connect the A102 No. 1 headlight ECU sub-assembly LH connector.

    3. Clear the DTCs.

      Click here

    4. Turn the ignition switch to ON.

    5. Check for DTCs.

      Click here

      Result
      Result Proceed to
      Only DTC B2424 is output A
      DTC B2424 and B2425 are output B

    B

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

    A

  7. CHECK HEADLIGHT LEVELING MOTOR LH


    1. Disconnect the headlight leveling motor LH connector.

    2. Connect the No. 1 headlight ECU sub-assembly LH connectors.

    3. Clear the DTCs.

      Click here

    4. Turn the ignition switch to ON.

    5. Check for DTCs.

      Click here

      Result
      Result Proceed to
      Only DTC B2424 is output A
      DTC B2424 and B2425 are output B

    A

    REPLACE HEADLIGHT LEVELING MOTOR LH Click here

    B

    REPLACE HEADLIGHT UNIT LH Click here

  8. CHECK HEADLIGHT UNIT LH


    1. Remove the headlight unit LH.

      Click here

      B001EKOC01
      *a

      Front view of wire harness connector

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

      		 *b

      Front view of wire harness connector

      (to Headlight Unit Assembly LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B-7 (ACTBI) - E-1 Always Below 1 Ω
      B-17 (ACTGI) - E-3 Always Below 1 Ω
      C-13 (LINLI) - E-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT LH Click here

    OK

  9. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH


    1. B001ECUC01
      *a

      Front view of wire harness connector

      (to Headlight Leveling Motor LH)

      Disconnect the headlight leveling motor LH connector.

    2. Connect the No. 1 headlight ECU sub-assembly LH connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E-1 - E-3 Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  10. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH


    1. Remove the No. 1 headlight ECU sub-assembly LH as a unit with the connectors still connected.

      Click here

    2. Disconnect the A103 No. 1 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
      C-13 (LINLI) - A103-20 (LINL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LEVELING MOTOR LH Click here

    NG

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

  11. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH)


    1. Disconnect the A102 No. 1 headlight ECU sub-assembly LH connector.

    2. Disconnect the A103 No. 1 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
      A102-20 (LINL) - A103-20 (LINL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HEADLIGHT UNIT RH


    1. Remove the headlight unit RH.

      Click here

      B001EKOC01
      *a

      Front view of wire harness connector

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

      		 *b

      Front view of wire harness connector

      (to Headlight Unit Assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B-7 (ACTBI) - E-1 Always Below 1 Ω
      B-17 (ACTGI) - E-3 Always Below 1 Ω
      B-13 (LINLI) - E-2 Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT RH Click here

    OK

  13. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH


    1. B001ECUC01
      *a

      Front view of wire harness connector

      (to Headlight Leveling Motor RH)

      Disconnect the headlight leveling motor RH connector.

    2. Connect the No. 1 headlight ECU sub-assembly RH connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E-1 - E-3 Ignition switch ON 11 to 14 V
      Ignition switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  14. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH


    1. Remove the No. 1 headlight ECU sub-assembly RH as a unit with the connectors still connected.

      Click here

    2. Disconnect the A102 No. 1 headlight ECU sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C-13 (LINLI) - A102-20 (LINL) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT LEVELING MOTOR RH Click here

    NG

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