LIGHTING SYSTEM, Diagnostic DTC:B2430, B2431

DTC Code DTC Name
B2430 LED Headlight LH Circuit Malfunction
B2431 LED Headlight RH Circuit Malfunction

DESCRIPTION

These DTCs are stored when the low beam headlights do not illuminate, or a malfunction is detected in the communication between the headlight assembly and the main body ECU (multiplex network body ECU).

DTC Code DTC Detection Condition Trouble Area
B2430 LED headlight LH circuit malfunction

  • Light control ECU LH

  • Headlight unit LH

  • Power distributor (engine room junction block assembly)

  • Harness or connector

  • Main Body ECU (multiplex network body ECU)
B2431 LED headlight RH circuit malfunction

  • Light control ECU RH

  • Headlight unit RH

  • Power distributor (engine room junction block assembly)

  • Harness or connector

  • Main Body ECU (multiplex network body ECU)

WIRING DIAGRAM

A01NDDLE01

INSPECTION PROCEDURE

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      Both DTC B2430 and DTC B2431 are not output. A
      Both DTC B2430 and DTC B2431 are output. B
      DTC B2430 or B2431 is output. C

    B

    INSPECT POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Click here

    C

    INSPECT HEADLIGHT ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK

  2. INSPECT POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY)


    1. A01NFJ6E04
      Text in Illustration
      *1

      Component without harness connected

      (Power Distributor (Engine Room Junction Block Assembly))

      Remove the power distributor (engine room junction block assembly) from the engine room relay block Click here.

    2. Connect a positive (+) lead from the battery to terminal 3A-1

    3. Connect a negative (-) lead from the battery to terminals 3C-13 and 3C-17.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3B-3 - Battery negative Always 11 to 14 V
      3B-4 - Battery negative Always 11 to 14 V

    NG

    REPLACE POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTOR - BATTERY AND BODY GROUND)


    1. A01NE6DE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Distributor (Engine Room Junction Block Assembly))

      Disconnect the 3A power distributor (engine room junction block assembly) connector.

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

      Standard Voltage
      Tester Connector Condition Specified Condition
      3A-1 - Body ground Always 11 to 14 V
    3. A01NEWJE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Distributor (Engine Room Junction Block Assembly))

      Disconnect the 3C power distributor (engine room junction block assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3C-17 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTOR - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. A01NDUUE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Distributor (Engine Room Junction Block Assembly))
      *2

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      Disconnect the 3C power distributor (engine room junction block assembly) connector.

    2. Disconnect the 2F instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3C-13 - 2F-37 Always Below 1 Ω
      3C-13 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. A01NFYFE04
      Text in Illustration
      *1

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      Remove the instrument panel junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2F-37 - A-15 (HRLY) Always Below 1 Ω
      2F-37 - Body ground Always 10 kΩ or higher

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  6. INSPECT HEADLIGHT ASSEMBLY


    1. A01NF99E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Headlight Assembly LH)
      *2

      Front view of wire harness connector

      (to Headlight Assembly RH)

      Disconnect the A85 or A86 headlight assembly connector.

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

      Standard Voltage
      LH Side (B2430)
      Tester Connection Switch Condition Specified Condition
      A85-4 - Body ground Light control switch in head position 11 to 14 V
      RH Side (B2431)
      Tester Connection Switch Condition Specified Condition
      A86-4 - Body ground Light control switch in head position 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - POWER DISTRIBUTOR) Click here

    OK

  7. INSPECT HEADLIGHT ASSEMBLY


    1. A01NF99E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Headlight Assembly LH)
      *2

      Front view of wire harness connector

      (to Headlight Assembly RH)

      Disconnect the A85 or A86 headlight assembly connector.

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

      Standard Voltage
      LH Side (B2430)
      Tester Connection Switch Condition Specified Condition
      A85-5 - Body ground Light control switch in head position 4.5 to 5.5 V
      RH Side (B2431)
      Tester Connection Switch Condition Specified Condition
      A86-5 - Body ground Light control switch in head position 4.5 to 5.5 V

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT ASSEMBLY) Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND)


    1. A01NF99E03
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Headlight Assembly LH)
      *2

      Front view of wire harness connector

      (to Headlight Assembly RH)

      Disconnect the A85 or A86 headlight assembly connector.

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

      Standard Resistance
      LH Side (B2430)
      Tester Connection Condition Specified Condition
      A85-3 - Body ground Always Below 1 Ω
      RH Side (B2431)
      Tester Connection Condition Specified Condition
      A86-3 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE LIGHT CONTROL ECU


    1. Temporarily replace the light control ECU with a new or normally functioning one Click here.

    2. Check for DTC Click here.

      OK
      DTC B2430 or B2431 output does not occur.

    NG

    REPLACE HEADLIGHT UNIT Click here

    OK

    END

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - POWER DISTRIBUTOR)


    1. A01NGRIE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Distributor (Engine Room Junction Block Assembly))
      *2

      Front view of wire harness connector

      (to Headlight Assembly LH)
      *3

      Front view of wire harness connector

      (to Headlight Assembly RH)

      Disconnect the 3B power distributor (engine room junction block assembly) connector.

    2. Disconnect the A85 or A86 headlight assembly connector.

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

      Standard Resistance
      LH Side (B2430)
      Tester Connection Condition Specified Condition
      3B-4 - A85-4 Always Below 1 Ω
      3B-4 - Body ground Always 10 kΩ or higher
      RH Side (B2431)
      Tester Connection Condition Specified Condition
      3B-3 - A86-4 Always Below 1 Ω
      3B-3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER DISTRIBUTOR (ENGINE ROOM JUNCTION BLOCK ASSEMBLY) Click here

  11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT ASSEMBLY)

    A01NHVDE02
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Headlight Assembly LH)
    *2

    Front view of wire harness connector

    (to Headlight Assembly RH)
    *3

    Front view of wire harness connector

    (to Main Body ECU (Multiplex Network Body ECU))

    1. Disconnect the F14 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the A85 or A86 headlight assembly connector.

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

      Standard Resistance
      LH Side (B2430)
      Tester Connection Condition Specified Condition
      F14-21 (LLEW) - A85-5 Always Below 1 Ω
      F14-21 (LLEW) - Body ground Always 10 kΩ or higher
      RH Side (B2431)
      Tester Connection Condition Specified Condition
      F14-8 (RLEW) - A86-5 Always Below 1 Ω
      F14-8 (RLEW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here