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 LED headlight LH circuit malfunction

  • Light control ECU LH

  • Headlight unit LH

  • No. 1 integration relay

  • Harness or connector

  • Main body ECU (multiplex network body ECU)
B2431 LED headlight RH circuit malfunction

  • Light control ECU RH

  • Headlight unit RH

  • No. 1 integration relay

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

WIRING DIAGRAM

A003ZCUE02

INSPECTION PROCEDURE

Note

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

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

    CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AUXILIARY BATTERY AND BODY GROUND) Click here

    C

    INSPECT HEADLIGHT UNIT Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  2. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AUXILIARY BATTERY AND BODY GROUND)


    1. Disconnect the 1G and 1H No. 1 integration relay connectors.

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

      Standard Voltage
      Tester Connector Condition Specified Condition
      1G-14 (IG1) - Body ground Power switch on (IG) 11 to 14 V
      1H-7 (BATT) - Body ground Power switch off 11 to 14 V
      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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

    2. Disconnect the 2C instrument panel junction block assembly connector.

    3. 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) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      A003W2DE02

    2. 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
      2C-32 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 *b

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

    OK

  5. REPLACE NO. 1 INTEGRATION RELAY


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

    2. Check for DTCs Click here.

      OK
      DTC B2430 and B2431 are not output.

    NG

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

    OK

    END

  6. INSPECT HEADLIGHT UNIT


    1. A003ZGXE14
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Unit LH)
      *b

      Front view of wire harness connector

      (to Headlight Unit RH)

      Disconnect the A47 or A48 headlight unit connector.

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

      Standard Voltage
      LH Side (B2430)
      Tester Connection Switch Condition Specified Condition
      A47-3 (LO) - Body ground Light control switch in head position 11 to 14 V
      RH Side (B2431)
      Tester Connection Switch Condition Specified Condition
      A48-3 (LO) - Body ground Light control switch in head position 11 to 14 V

    NG

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

    OK

  7. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)


    1. A003ZGXE15
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Headlight Unit LH)
      *b

      Front view of wire harness connector

      (to Headlight Unit RH)

      Disconnect the A47 or A48 headlight unit connector.

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

      Standard Voltage
      LH Side (B2430)
      Tester Connection Switch Condition Specified Condition
      A47-2 (IN2) - Body ground Light control switch in head position 4.5 to 5.5 V
      RH Side (B2431)
      Tester Connection Switch Condition Specified Condition
      A48-2 (IN1) - Body ground Light control switch in head position 4.5 to 5.5 V

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT UNIT) Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - BODY GROUND)


    1. Disconnect the A47 or A48 headlight unit connector.

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

      Standard Resistance
      LH Side (B2430)
      Tester Connection Condition Specified Condition
      A47-6 (E) - Body ground Always Below 1 Ω
      RH Side (B2431)
      Tester Connection Condition Specified Condition
      A48-6 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE LIGHT CONTROL ECU


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

    2. Check for DTCs Click here.

      OK
      DTC B2430 or B2431 is not output.

    NG

    REPLACE HEADLIGHT UNIT Click here

    OK

    END

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT - NO. 1 INTEGRATION RELAY)


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

    2. Disconnect the A47 or A48 headlight unit connector.

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

      Standard Resistance
      LH Side (B2430)
      Tester Connection Condition Specified Condition
      1G-2 (HLPL) - A47-3 (LO) Always Below 1 Ω
      1G-2 (HLPL) - Body ground Always 10 kΩ or higher
      RH Side (B2431)
      Tester Connection Condition Specified Condition
      1G-1 (HLPR) - A48-3 (LO) Always Below 1 Ω
      1G-1 (HLPR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NO. 1 INTEGRATION RELAY Click here

  11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT UNIT)


    1. Disconnect the H17 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the A47 or A48 headlight unit connector.

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

      Standard Resistance
      LH Side (B2430)
      Tester Connection Condition Specified Condition
      H17-21 (LLEW) - A47-2 (IN2) Always Below 1 Ω
      H17-21 (LLEW) - Body ground Always 10 kΩ or higher
      RH Side (B2431)
      Tester Connection Condition Specified Condition
      H17-8 (RLEW) - A48-2 (IN1) Always Below 1 Ω
      H17-8 (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