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LIGHTING SYSTEM, Diagnostic DTC:B2430, B2431

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DTC Code DTC Name
B2430 LED Headlight LH Circuit Malfunction
B2431 LED Headlight RH Circuit Malfunction
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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 power switch was turned on (IG):


  • Light control ECU malfunction

  • Headlight unit malfunction

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


  • Light control ECU malfunction

  • Headlight unit malfunction

  • Light control ECU 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
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WIRING DIAGRAM

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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 power switch was turned on (IG).

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

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PROCEDURE


  1. Click here

    CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      1. Body Electrical > Main Body > Clear DTCs


    2. Check for DTCs.

      Click here


      1. 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

  2. Click here

    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

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

  3. Click here

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


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

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

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    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
      1D-8 (HLLS) - 4C-29 Always Below 1 Ω
      1D-8 (HLLS) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      Click here

    2. B003Y2XC01
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

      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.

      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 ASSEMBLYClick here

  6. Click here

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


    1. Disconnect the A34*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
      Table 1. for LH Side (B2430)
      Tester Connection Condition Specified Condition
      A34-6 (B) - Body ground Power switch off, light control switch in head position 11 to 14 V
      Table 2. for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A2-6 (B) - Body ground Power switch off, light control switch in head position 11 to 14 V
      Result
      Proceed to
      OK
      NG

  7. Click here

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - BODY GROUND)


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

      Standard Resistance
      Table 3. for LH Side (B2430)
      Tester Connection Condition Specified Condition
      A34-5 (LO) - Body ground Always Below 1 Ω
      Table 4. for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A2-5 (LO) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. Click here

    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
      Table 5. for LH Side (B2430)
      Tester Connection Condition Specified Condition
      A34-7 (S) - Body ground Power switch on (IG), light control switch in head position 11 to 14 V
      Table 6. for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A2-7 (S) - Body ground Power switch on (IG), light control switch in head position 11 to 14 V
      Result
      Proceed to
      OK
      NG

  9. Click here

    CHECK LIGHT CONTROL LED ECU


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

      Click here

    2. Check for DTCs.

      Click here


      1. Body Electrical > Main Body > Trouble Codes


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

  10. Click here

    CHECK HEADLIGHT UNIT


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

      Click here

    2. Check for DTCs.

      Click here


      1. Body Electrical > Main Body > Trouble Codes


      Result
      Result Proceed to
      Both DTCs 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. Click here

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


    1. Disconnect the K2 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Table 7. for LH Side (B2430)
      Tester Connection Condition Specified Condition
      A34-7 (S) - K2-16 (LLEW) Always Below 1 Ω
      A34-7 (S) - Body ground Always 10 kΩ or higher
      Table 8. for RH Side (B2431)
      Tester Connection Condition Specified Condition
      A2-7 (S) - K2-3 (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

  12. Click here

    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

      Result
      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 ECUClick here