LIGHTING SYSTEM(for Single Beam Headlight), 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 engine switch was turned on (IG):


  • Headlight unit assembly malfunction

  • Headlight housing assembly malfunction

  • Light control ECU malfunction

  • Light control ECU power source and signal malfunction

  • Headlight unit assembly LH

  • Headlight housing assembly LH

  • Light control ECU 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 engine switch was turned on (IG):


  • Headlight unit assembly malfunction

  • Headlight housing assembly malfunction

  • Light control ECU malfunction

  • Light control ECU power source and signal malfunction

  • Headlight unit assembly RH

  • Headlight housing assembly RH

  • Light control ECU RH

  • Semiconductor pwr integration ECU

  • Instrument panel junction block assembly

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

WIRING DIAGRAM

B00746QE09

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 engine switch was turned on (IG).

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

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 DTCs B2430 and B2431 are not output. A
      Both DTCs 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 POWER INTEGRATION ECU


    1. Remove the semiconductor pwr integration ECU from the No. 2 engine room relay block and No. 2 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 POWER 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 4C 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
      2D-8 (HLLS) - 4C-29 Always Below 1 Ω
      2D-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.

      B0075MSC01
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      4C-29 - 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 A31*1 or A2*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
      A31-5 (LO) - Body ground Engine switch off, light control switch in head position 11 to 14 V
      for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A2-5 (LO) - Body ground Engine switch off, light control switch in head position 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    INSPECT SEMICONDUCTOR POWER 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
      A31-6 (E) - Body ground Always Below 1 Ω
      for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A2-6 (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
      A31-7 (S) - Body ground Engine switch on (IG), light control switch in head position 11 to 14 V
      for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A2-7 (S) - Body ground Engine switch on (IG), 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 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 DTCs B2430 and B2431 are not output. A
      DTC B2430 is output. B
      DTC B2431 is output. C

    A

    END

    C

    INSPECT HEADLIGHT HOUSING ASSEMBLY RH Click here

    B

  10. INSPECT HEADLIGHT HOUSING ASSEMBLY LH


    1. Remove the headlight assembly LH.

      Click here

    2. Remove the headlight housing assembly LH from the headlight assembly LH.

      Click here

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

      B00731SC03
      *a

      Component without harness connected

      (Headlight Housing Assembly LH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-2 - B-2 Always Below 1 Ω
      A-4 - B-7 Always Below 1 Ω
      B-5 - A31-5 (LO) Always Below 1 Ω
      B-1 - A31-6 (E) Always Below 1 Ω
      B-8 - A31-7 (S) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY LH Click here

    OK

  11. REPLACE HEADLIGHT UNIT ASSEMBLY LH


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

      Click here

    2. Check for DTCs.

      Click here

      OK
      DTC B2430 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY LH WAS DEFECTIVE)

    NG

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

  12. INSPECT HEADLIGHT HOUSING ASSEMBLY RH


    1. Remove the headlight assembly RH.

      Click here

    2. Remove the headlight housing assembly RH from the headlight assembly RH.

      Click here

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

      B0076SBC01
      *a

      Component without harness connected

      (Headlight Housing Assembly RH)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      A-2 - B-2 Always Below 1 Ω
      A-4 - B-7 Always Below 1 Ω
      B-5 - A2-5 (LO) Always Below 1 Ω
      B-1 - A2-6 (E) Always Below 1 Ω
      B-8 - A2-7 (S) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY RH Click here

    OK

  13. REPLACE HEADLIGHT UNIT ASSEMBLY RH


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

      Click here

    2. Check for DTCs.

      Click here

      OK
      DTC B2431 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT ASSEMBLY RH WAS DEFECTIVE)

    NG

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

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


    1. Disconnect the O2 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
      A31-7 (S) - O2-16 (LLEW) Always Below 1 Ω
      A31-7 (S) - Body ground Always 10 kΩ or higher
      for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A2-7 (S) - O2-3 (RLEW) Always Below 1 Ω
      A2-7 (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

  15. INSPECT SEMICONDUCTOR POWER INTEGRATION ECU


    1. Remove the semiconductor pwr integration ECU from the No. 2 engine room relay block and No. 2 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 PWR INTEGRATION ECU)

    NG

    REPLACE SEMICONDUCTOR POWER INTEGRATION ECU Click here