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Home >> Lexus >> 2021 >> GX 460 Luxury >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (Exterior) (Diagnostic Codes & Circuit Tests) >> Lighting System >> DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction [08/2015 - 08/2019] >> Procedure

DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction [08/2015 - 08/2019]: Procedure

  1. CLEAR DTC 
    1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

      OK

      DTC B2430 or B2431 output does not occur.

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )

    Result: 

    NG 

    See step  3

  3. INSPECT HEADLIGHT RELAY (H-LP LO) 
    1. Remove the headlight relay from the engine room relay block assembly.
      GTY221950Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 - 5 Battery voltage not applied between terminals 1 and 2 10 kΩ or higher
      3 - 5 Battery voltage applied between terminals 1 and 2 Below 1 Ω

    Result: 

    NG 

    REPLACE HEADLIGHT RELAY (H-LP LO) 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - BATTERY) 
    1. Remove the headlight relay from the engine room relay block assembly.
      GTY635665Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      Headlight relay terminal 5 - Body ground Always 11 to 14 V
      Headlight relay terminal 1 - Body ground
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Headlight Relay [H-LP LO])

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - DRIVER SIDE JUNCTION BLOCK ASSEMBLY) 
    1. Remove the headlight relay from the engine room relay block assembly.
    2. Disconnect the 2F driver side junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Headlight relay terminal 2 - 2F-40 Always Below 1 Ω
      2F-40 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. INSPECT DRIVER SIDE JUNCTION BLOCK ASSEMBLY 
    1. Remove the driver side junction block assembly (Refer to REMOVAL [08/2015 - 08/2019] ).
      GTY683318Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the main body ECU from the driver side junction block assembly (Refer to REMOVAL [08/2015 - 08/2019] ).
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A-15 (HRLY) - 2F-40 Always Below 1 Ω

    Result: 

    NG 

    REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (HEADLIGHT RELAY [H-LP LO] - HEADLIGHT) 
    1. *1: for LH
    2. *2: for RH
    1. Remove the headlight relay from the engine room relay block assembly.
    2. Disconnect the A29*1 and A30*2 headlight connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Headlight relay terminal 3 - A29-8 (B)*1 Always Below 1 Ω
      Headlight relay terminal 3 - A30-8 (B)*2 Always Below 1 Ω
      Headlight relay terminal 3 - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (HEADLIGHT - MAIN BODY ECU AND BODY GROUND) 
    1. Disconnect the A29*1 or A30*2 headlight unit connector.
      1. *1: for LH
      2. *2: for RH
    2. Disconnect the G46 main body ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      for LH 

      Tester Connection Condition Specified Condition
      A29-6 (S) - G46-21 (LLEW) Always Below 1 Ω
      A29-2 (E) - Body ground Below 1 Ω
      A29-6 (S) - Body ground 10 kΩ or higher

      for RH 

      Tester Connection Condition Specified Condition
      A30-6 (S) - G46-8 (HUM) Always Below 1 Ω
      A30-2 (E) - Body ground Below 1 Ω
      A30-6 (S) - Body ground 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  9

  9. CHECK HEADLIGHT ASSEMBLY 
    1. Temporarily replace the headlight with a new or normally functioning one (Refer to REMOVAL [08/2015 - 08/2019] ).
    2. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

      OK

      DTC B2430 or B2431 output does not occur.

    Result: 

    OK 

    END (REPLACE HEADLIGHT) 

    (Refer to DISASSEMBLY [08/2015 - 08/2019] )

    Result: 

    NG 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

    (Refer to REMOVAL [08/2015 - 08/2019] )

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