LIGHTING SYSTEM, Diagnostic DTC:B2430, B2431

DTC Code DTC Name
B2430 LED Headlight LH
B2431 LED Headlight RH

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 LED headlight LH circuit malfunction

  • Headlight unit assembly LH

  • Headlight unit LH

  • No. 1 integration relay

  • Main body ECU (multiplex network body ECU)

  • Instrument panel junction block assembly

  • Harness or connector
B2431 LED headlight RH circuit malfunction

  • Headlight unit assembly RH

  • Headlight unit RH

  • No. 1 integration relay

  • Main body ECU (multiplex network body ECU)

  • Instrument panel junction block assembly

  • Harness or connector

Tech Tips

DTC B2430 and B2431 are not stored until 12 seconds have elapsed after turning the power switch on (READY).

WIRING DIAGRAM

B001N9ME04

CAUTION / NOTICE / HINT

Note

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

PROCEDURE


  1. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Trouble Codes.

    5. Clear the DTCs.

      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Operate the light control switch to turn on the low beam headlights and wait 12 seconds or more.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Main Body / Trouble Codes.

    6. Check for DTCs.

      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 LO TERMINAL VOLTAGE) Click here

    B

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY)


    1. Remove the No. 1 integration relay.

      Click here

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1H-7 (BATT) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1G-22 (GND1) - Body ground Always Below 1 Ω
      1H-3 (GND2) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 2C 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
      1G-9 (HL4) - 2C-32 Always Below 1 Ω
      1G-9 (HL4) or 2C-32 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    B001KZBC42
    *a

    Component without harness connected

    (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.

      Standard Resistance
      Tester Connection Condition Specified Condition
      2C-32 - A-15 (HRLY) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    OK

  7. REPLACE NO. 1 INTEGRATION RELAY


    1. Replace the No. 1 integration relay with a new or a known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CLEAR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Main Body / Trouble Codes.

    5. Clear the DTCs.

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK FOR DTC


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    3. Operate the light control switch to turn on the low beam headlights and wait 12 seconds or more.

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Main Body / Trouble Codes.

    6. Check for DTCs.

      OK
      DTC B2430 and B2431 are not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (NO. 1 INTEGRATION RELAY WAS DEFECTIVE)

    NG

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

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY LO TERMINAL VOLTAGE)


    1. Disconnect the A73 or A75 headlight assembly connector.

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

      Standard Voltage
      LH Side
      Tester Connection Condition Specified Condition
      A73-5 (LO) - Body ground Light control switch in head position 11 to 14 V
      RH Side
      Tester Connection Condition Specified Condition
      A75-5 (LO) - Body ground Light control switch in head position 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY) Click here

    OK

  11. 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
      Tester Connection Condition Specified Condition
      A73-6 (E) - Body ground Always Below 1 Ω
      RH Side
      Tester Connection Condition Specified Condition
      A75-6 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY S TERMINAL VOLTAGE)


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

      Standard Voltage
      LH Side
      Tester Connection Condition Specified Condition
      A73-1 (S) - Body ground Power switch on (IG) 11 to 14 V
      RH Side
      Tester Connection Condition Specified Condition
      A75-1 (S) - Body ground Power switch on (IG) 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

  13. INSPECT HEADLIGHT UNIT ASSEMBLY


    1. Remove the headlight unit assembly.

      Click here

    2. Inspect the headlight unit assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT UNIT Click here

    NG

    REPLACE HEADLIGHT UNIT ASSEMBLY Click here

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


    1. Disconnect the H17 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
      Tester Connection Condition Specified Condition
      A73-1 (S) - H17-21 (LLEW) Always Below 1 Ω
      A73-1 (S) or H17-21 (LLEW) - Body ground Always 10 kΩ or higher
      RH Side
      Tester Connection Condition Specified Condition
      A75-1 (S) - H17-8 (RLEW) Always Below 1 Ω
      A75-1 (S) or H17-8 (RLEW) - 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. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY)


    1. Disconnect the 1G No. 1 integration relay connector.

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

      Standard Resistance
      LH Side
      Tester Connection Condition Specified Condition
      1G-2 (HLPL) - A73-5 (LO) Always Below 1 Ω
      1G-2 (HLPL) or A73-5 (LO) - Body ground Always 10 kΩ or higher
      RH Side
      Tester Connection Condition Specified Condition
      1G-1 (HLPR) - A75-5 (LO) Always Below 1 Ω
      1G-1 (HLPR) or A75-5 (LO) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 INTEGRATION RELAY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR