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 main body ECU (multiplex network body ECU).

DTC No. DTC Detection Condition Trouble Area
B2430

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


  • Light control ECU malfunction

  • Headlight unit malfunction

  • Light control ECU power source and signal malfunction

  • Headlight unit LH

  • H-LP relay

  • Harness or connector

  • Main body ECU (multiplex network body ECU)
B2431

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


  • Light control ECU malfunction

  • Headlight unit malfunction

  • Light control ECU power source and signal malfunction

  • Headlight unit RH

  • H-LP relay

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

A01HZSSE01

INSPECTION PROCEDURE

Note


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

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

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      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

    B

    INSPECT H-LP RELAY Click here

    C

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

    A

    USE SIMULATION METHOD TO CHECK Click here

  2. INSPECT H-LP RELAY


    1. A01I0E2E08
      Text in Illustration
      *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

    NG

    REPLACE H-LP RELAY

    OK

  3. CHECK HARNESS AND CONNECTOR (BATTERY - 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 2 - Body ground Always 11 to 14 V
      Relay Terminal 5 - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the A86 headlight assembly LH connector.

    2. Disconnect the A89 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 - A86-1 (LO) Always Below 1 Ω
      Relay Terminal 3 - A89-1 (LO) Always Below 1 Ω
      Relay Terminal 3 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the 3D 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 1 - 3D-12 Always Below 1 Ω
      Relay Terminal 1 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. 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.

      A01HZ3ME04
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -
      Standard Resistance
      Tester Connection Condition Specified Condition
      3D-12 - MB-15 (HRLY) Always Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

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

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


    1. Disconnect the A86 or A89 headlight assembly connector.

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

      Standard Voltage
      LH Side (DTC B2430)
      Tester Connection Condition Specified Condition
      A86-1 (LO) - Body ground Ignition switch off, light control switch in head position 11 to 14 V
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A89-1 (LO) - Body ground Ignition switch off, light control switch in head position 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. 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
      A86-4 (E) - Body ground Always Below 1 Ω
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A89-4 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. 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
      A86-2 (S) - Body ground Ignition switch ON, light control switch in head position 11 to 14 V
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      A89-2 (S) - Body ground Ignition switch ON, light control switch in head position 11 to 14 V

    NG

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

    OK

  10. REPLACE HEADLIGHT UNIT


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

    2. Check for DTCs Click here.

      OK
      DTC B2430 or B2431 is not output.

    NG

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

    OK

    END (HEADLIGHT UNIT WAS DEFECTIVE)

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


    1. Disconnect the I12 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
      I12-24 (LLEW) - A86-2 (S) Always Below 1 Ω
      I12-24 (LLEW) - Body ground Always 10 kΩ or higher
      RH Side (DTC B2431)
      Tester Connection Condition Specified Condition
      I12-21 (RLEW) - A89-2 (S) Always Below 1 Ω
      I12-21 (RLEW) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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