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 communication malfunction is detected between the headlight assembly and main body ECU (multiplex network body ECU).

DTC No. Detection Item DTC Detection Condition Trouble Area
B2430 LED Headlight LH Circuit Malfunction

Any of the following conditions occur after 20 seconds have elapsed since the ignition switch was turned ON:


  • Light control ECU LH malfunction

  • Headlight unit LH malfunction

  • Light control ECU LH power source and signal malfunction

  • Light control LED ECU LH

  • Headlight unit LH

  • Semiconductor pwr integration ECU

  • Instrument panel junction block assembly

  • Main body ECU (multiplex network body ECU)

  • Harness or connector
B2431 LED Headlight RH Circuit Malfunction

Any of the following conditions occur after 20 seconds have elapsed since the ignition switch was turned ON:


  • Light control ECU RH malfunction

  • Headlight unit RH malfunction

  • Light control ECU RH power source and signal malfunction

  • Light control LED ECU RH

  • Headlight unit RH

  • Semiconductor pwr integration ECU

  • Instrument panel junction block assembly

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

A018LQOE01

CAUTION / NOTICE / HINT

Note


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

  • DTC B2430 and B2431 are not output if 20 seconds have not elapsed since the ignition switch was turned ON.

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.*


    • *: w/ Smart Entry and Start System

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    Click here


    • *: for LHD

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      Both DTC B2430 and B2431 are not output. A
      Both DTC B2430 and B2431 are output. B
      Only DTC B2430 or B2431 is output. C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - HEADLIGHT ASSEMBLY) Click here

    B

  2. INSPECT SEMICONDUCTOR PWR INTEGRATION ECU


    1. Remove the semiconductor pwr integration ECU from the No. 1 engine room relay block and No. 1 junction block assembly.

      Click here

    2. Inspect the semiconductor pwr integration ECU.

      Click here

      OK
      Semiconductor pwr integration ECU is normal.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEMICONDUCTOR PWR INTEGRATION ECU Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - BATTERY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2B-1 (BATT) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 1D instrument panel junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1D-8 (HLLS) - 4F-27 Always Below 1 Ω
      1D-8 (HLLS) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      Click here

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

      A0028CQC05
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      4F-27 - MB-15 (HRLY) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

  6. CHECK HARNESS AND CONNECTOR (SEMICONDUCTOR PWR INTEGRATION ECU - HEADLIGHT ASSEMBLY)


    1. Disconnect the A21*1 or A29*2 headlight assembly connector.


      • *1: for LH Side

      • *2: for RH Side

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

      Standard Voltage
      for LH Side (B2430)
      Tester Connection Condition Specified Condition
      A21-2 (LO) - Body ground Ignition switch off, light control switch in head position 11 to 14 V
      for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A29-2 (LO) - Body ground Ignition switch off, light control switch in head position 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SEMICONDUCTOR PWR INTEGRATION ECU Click here

    OK

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


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

      Standard Resistance
      for LH Side (B2430)
      Tester Connection Condition Specified Condition
      A21-3 (E) - Body ground Always Below 1 Ω
      for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A29-3 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


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

      Standard Voltage
      for LH Side (B2430)
      Tester Connection Condition Specified Condition
      A21-1 (S) - Body ground Ignition switch ON, light control switch in head position 11 to 14 V
      for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A29-1 (S) - Body ground Ignition switch ON, light control switch in head position 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  9. CHECK LIGHT CONTROL ECU


    1. Temporarily replace the light control LED ECU with a new or known good one.

      Click here

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      Both DTC B2430 and B2431 are not output. A
      Only DTC B2430 or B2431 is output. B

    A

    END (LIGHT CONTROL LED ECU WAS DEFECTIVE)

    B

  10. CHECK HEADLIGHT UNIT


    1. Temporarily replace the headlight unit with a new or known good one.

      Click here

    2. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      Both DTC B2430 and B2431 are not output. A
      Only DTC B2430 or B2431 is output. B

    A

    END (HEADLIGHT UNIT WAS DEFECTIVE)

    B

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

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


    1. Disconnect the F19 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      for LH Side (B2430)
      Tester Connection Condition Specified Condition
      A21-1 (S) - F19-16 (LLEW) Always Below 1 Ω
      A21-1 (S) - Body ground Always 10 kΩ or higher
      for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A29-1 (S) - F19-3 (RLEW) Always Below 1 Ω
      A29-1 (S) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. INSPECT SEMICONDUCTOR PWR INTEGRATION ECU


    1. Remove the semiconductor pwr integration ECU from the No. 1 engine room relay block and No. 1 junction block assembly.

      Click here

    2. Inspect the semiconductor pwr integration ECU.

      Click here

      OK
      Semiconductor pwr integration ECU is normal.
      Result
      Proceed to
      OK
      NG

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT ASSEMBLY - SEMICONDUCTOR POWER INTEGRATION ECU)

    NG

    REPLACE SEMICONDUCTOR PWR INTEGRATION ECU Click here