LIGHTING SYSTEM, Diagnostic DTC:B2430 and 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.

  • *1: except Sedan

  • *2: for Sedan

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

    E317750E05

  2. for Sedan

    E348046E02

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 DTCClick 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. E318761C01

      *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.

      E259586C21

      *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

    for RHD:Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    for LHD:Click here

    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

      Table 1. LH Side (DTC B2430)

      Tester Connection

      Condition

      Specified Condition

      A70-4 (LO) - Body ground

      Light control switch in head position

      11 to 14 V
      Table 2. 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

      Table 3. LH Side (DTC B2430)

      Tester Connection

      Condition

      Specified Condition

      A70-8 (E) - Body ground

      Always

      Below 1 Ω
      Table 4. 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

      Table 5. 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
      Table 6. 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

      Table 7. 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
      Table 8. 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

    Click here

    C

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

    B

  14. INSPECT H-LP RELAY

    1. E318761C01

      *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.

      E259586C21

      *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

    for RHD:Click here

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    for LHD:Click here

    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

      Table 9. LH Side (DTC B2430)

      Tester Connection

      Condition

      Specified Condition

      A184-2 (LO) - Body ground

      Light control switch in head position

      11 to 14 V
      Table 10. 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

      Table 11. LH Side (DTC B2430)

      Tester Connection

      Condition

      Specified Condition

      A184-5 (E) - Body ground

      Always

      Below 1 Ω
      Table 12. 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

      Table 13. 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
      Table 14. 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

    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

      Table 15. 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
      Table 16. 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

    for RHD:Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR