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 headlight swivel ECU assembly*1 or main body ECU (multiplex network body ECU)*2.


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

  • Headlight unit LH

  • H-LP relay

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

  • Headlight swivel ECU assembly (except Sedan)
B2431 LED Headlight RH Circuit Malfunction LED headlight RH circuit malfunction

  • Headlight unit RH

  • H-LP relay

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

  • Headlight swivel ECU assembly (except Sedan)

WIRING DIAGRAM


  1. except Sedan

    B00442HE04

  2. for Sedan

    B0043D0E02

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CHECK BODY TYPE


    1. Check body type.

      Result
      Result Proceed to
      except Sedan A
      for Sedan B

    B

    CHECK FOR DTC Click here

    A

  2. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs

    2. Check for DTCs.

      Click here


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

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - H-LP RELAY) Click here

    B

  3. INSPECT H-LP RELAY


    1. B0041YOC01
      *a

      Component without harness connected

      (H-LP Relay)

      Remove the H-LP relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage applied between terminals 1 and 2 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE H-LP RELAY

    OK

  4. CHECK HARNESS AND CONNECTOR (POWER SOURCE - H-LP RELAY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay Terminal 1 - Body ground Always 11 to 14 V
      Relay Terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (H-LP RELAY - HEADLIGHT ASSEMBLY LH AND HEADLIGHT ASSEMBLY RH)


    1. Disconnect the A70 headlight assembly LH connector.

    2. Disconnect the A73 headlight assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay Terminal 3 - A70-4 (LO) Always Below 1 Ω
      Relay Terminal 3 - A73-4 (LO) Always Below 1 Ω
      Relay Terminal 3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (H-LP RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3A 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
      Relay Terminal 2 - 3A-35 Always Below 1 Ω
      Relay Terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: 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.

      B0043U2C21
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-35 - MB-15 (HRLY) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here
    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: Click here

  8. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - H-LP RELAY)


    1. Disconnect the A70 or A73 headlight assembly connector.

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

      Standard Resistance
      LH Side (DTC B2430)
      Tester Connection Condition Specified Condition
      A70-4 (LO) - Body ground Light control switch in head position 11 to 14 V
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A73-4 (LO) - Body ground Light control switch in head position 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Resistance
      LH Side (DTC B2430)
      Tester Connection Condition Specified Condition
      A70-8 (E) - Body ground Always Below 1 Ω
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A73-8 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. CHECK HEADLIGHT ASSEMBLY (INPUT VOLTAGE)


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

      Standard Voltage
      LH Side (DTC B2430)
      Tester Connection Condition Specified Condition
      A70-6 (S) - Body ground Ignition switch ON, light control switch in head position 4.5 to 5.5 V
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A73-6 (S) - Body ground Ignition switch ON, light control switch in head position 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  11. REPLACE HEADLIGHT UNIT


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

      Click here

    2. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      OK
      DTC B2430 or B2431 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT WAS DEFECTIVE)

    NG

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

  12. CHECK HARNESS AND CONNECTOR (HEADLIGHT SWIVEL ECU ASSEMBLY - HEADLIGHT ASSEMBLY)


    1. Disconnect the A93 headlight swivel ECU assembly connector.

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

      Standard Resistance
      LH Side (DTC B2430)
      Tester Connection Condition Specified Condition
      A93-6 (INL) - A70-6 (S) Always Below 1 Ω
      A93-6 (INL) - Body ground Always 10 kΩ or higher
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A93-7 (INR) - A73-6 (S) Always Below 1 Ω
      A93-7 (INR) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  13. 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
      DTC B2430 or B2431 is output C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - H-LP RELAY) Click here

    B

  14. INSPECT H-LP RELAY


    1. B0041YOC01
      *a

      Component without harness connected

      (H-LP Relay)

      Remove the H-LP relay from the engine room relay block and junction block assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage applied between terminals 1 and 2 Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE H-LP RELAY

    OK

  15. CHECK HARNESS AND CONNECTOR (POWER SOURCE - H-LP RELAY)


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      Relay Terminal 1 - Body ground Always 11 to 14 V
      Relay Terminal 5 - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR (H-LP RELAY - HEADLIGHT ASSEMBLY LH AND HEADLIGHT ASSEMBLY RH)


    1. Disconnect the A184 headlight assembly LH connector.

    2. Disconnect the A183 headlight assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Relay Terminal 3 - A184-2 (LO) Always Below 1 Ω
      Relay Terminal 3 - A183-2 (LO) Always Below 1 Ω
      Relay Terminal 3 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. CHECK HARNESS AND CONNECTOR (H-LP RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3A 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
      Relay Terminal 2 - 3A-35 Always Below 1 Ω
      Relay Terminal 2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  18. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      for LHD: Click here

      for RHD: 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.

      B0043U2C21
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-35 - MB-15 (HRLY) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for LHD: Click here
    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY for RHD: Click here

  19. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - H-LP RELAY)


    1. Disconnect the A184 or A183 headlight assembly connector.

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

      Standard Resistance
      LH Side (DTC B2430)
      Tester Connection Condition Specified Condition
      A184-2 (LO) - Body ground Light control switch in head position 11 to 14 V
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A183-2 (LO) - Body ground Light control switch in head position 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Resistance
      LH Side (DTC B2430)
      Tester Connection Condition Specified Condition
      A184-5 (E) - Body ground Always Below 1 Ω
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A183-5 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  21. CHECK HEADLIGHT ASSEMBLY (INPUT VOLTAGE)


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

      Standard Voltage
      LH Side (DTC B2430)
      Tester Connection Condition Specified Condition
      A184-1 (S) - Body ground Ignition switch ON, light control switch in head position 4.5 to 5.5 V
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A183-1 (S) - Body ground Ignition switch ON, light control switch in head position 4.5 to 5.5 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  22. REPLACE HEADLIGHT UNIT


    1. 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
      OK
      DTC B2430 or B2431 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (HEADLIGHT UNIT WAS DEFECTIVE)

    NG

    REPLACE MULTIPLEX NETWORK BODY ECU for LHD: Click here
    REPLACE MULTIPLEX NETWORK BODY ECU for RHD: Click here

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


    1. Disconnect the E108 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      LH Side (DTC B2430)
      Tester Connection Condition Specified Condition
      E108-24 (LLEW) - A184-1 (S) Always Below 1 Ω
      E108-24 (LLEW) - Body ground Always 10 kΩ or higher
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      E108-21 (RLEW) - A183-1 (S) Always Below 1 Ω
      E108-21 (RLEW) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MULTIPLEX NETWORK BODY ECU for LHD: Click here
    REPLACE MULTIPLEX NETWORK BODY ECU for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR