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Home >> Toyota >> 2024 >> Corolla LE >> Repair and Diagnosis >> External Pages >> Different car >> Section 6 (Lighting System (Except HEV) (W/O AFS) - Diagnostic Codes, Symptom Tests & Circuit Tests (1 Of 2)) >> LIGHTING SYSTEM (for Gasoline Model without AFS) >> DTC B2430: LED Headlight LH; DTC B2431: LED Headlight RH [01/2019 - 03/2019] >> Procedure

DTC B2430: LED Headlight LH; DTC B2431: LED Headlight RH [01/2019 - 03/2019]: Procedure

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  1. CLEAR DTC 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Main Body / Trouble Codes.
    5. Clear the DTCs.

      Body Electrical > Main Body > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 
    1. Connect the Techstream to the DLC3.
    2. Start the engine.
    3. Operate the light control switch to turn on the low beam headlights and wait 10 seconds or more.
    4. Turn the Techstream on.
    5. Enter the following menus: Body Electrical / Main Body / Trouble Codes.
    6. Check for DTCs.

      Body Electrical > Main Body > Trouble Codes 

      OK

      DTC B2430 and B2431 are not output.

      Result

      Result Proceed to
      OK A
      NG (DTC B2430 is output) B
      NG (DTC B2431 is output) C

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

    Result: 

    C 

    See step  12

    Result: 

    B 

    See step  3

  3. INSPECT HEADLIGHT UNIT ASSEMBLY LH (LO TERMINAL VOLTAGE) 
    GTY846785Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Headlight Unit Assembly LH)
    1. Disconnect the A81 headlight unit assembly LH connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A81-3 (LO) - Body ground Light control switch in head position 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A81-4 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT HEADLIGHT UNIT ASSEMBLY LH (S TERMINAL VOLTAGE) 
    GTY846786Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Headlight Unit Assembly LH)
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A81-5 (S) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT UNIT ASSEMBLY LH. Refer to  DISASSEMBLY [01/2019 - 03/2019] 

    Result: 

    NG 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY LH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the I86 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A81-5 (S) - I86-14 (LLEW) Always Below 1 Ω
      A81-5 (S) or I86-14 (LLEW) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT UNIT ASSEMBLY LH) 
    1. Disconnect the 1B No. 1 integration relay connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1B-1 - A81-3 (LO) Always Below 1 Ω
      1B-1 or A81-3 (LO) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT NO. 1 INTEGRATION RELAY 
    1. Remove the No. 1 integration relay.

      Refer to REMOVAL [01/2019 - 03/2019]

    2. Inspect the No. 1 integration relay.

      Refer to INSPECTION [01/2019 - 09/2022]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1A-5 - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 4B 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
      1B-2 - 4B-31 Always Below 1 Ω
      1B-2 or 4B-31 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    GTY944477Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component without harness connected
    (Instrument Panel Junction Block Assembly)    		 - -
    1. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Refer to REMOVAL [01/2019 - 03/2019]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      4B-31 - MB-15 (HRLY) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [01/2019 - 03/2019] 

  12. INSPECT HEADLIGHT UNIT ASSEMBLY RH (LO TERMINAL VOLTAGE) 
    GTY846787Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Headlight Unit Assembly RH)
    1. Disconnect the A80 headlight unit assembly RH connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A80-3 (LO) - Body ground Light control switch in head position 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  16

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY RH - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A80-4 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. INSPECT HEADLIGHT UNIT ASSEMBLY RH (S TERMINAL VOLTAGE) 
    GTY846788Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Headlight Unit Assembly RH)
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A80-5 (S) - Body ground Ignition switch ON 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEADLIGHT UNIT ASSEMBLY RH. Refer to  DISASSEMBLY [01/2019 - 03/2019] 

    Result: 

    NG 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (HEADLIGHT UNIT ASSEMBLY RH - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the I86 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A80-5 (S) - I86-15 (RLEW) Always Below 1 Ω
      A80-5 (S) or I86-15 (RLEW) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  16. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT UNIT ASSEMBLY RH) 
    1. Disconnect the 1A No. 1 integration relay connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1A-12 - A80-3 (LO) Always Below 1 Ω
      1A-12 or A80-3 (LO) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  17

  17. INSPECT NO. 1 INTEGRATION RELAY 
    1. Remove the No. 1 integration relay.

      Refer to REMOVAL [01/2019 - 03/2019]

    2. Inspect the No. 1 integration relay.

      Refer to INSPECTION [01/2019 - 09/2022]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    OK 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (POWER SOURCE - NO. 1 INTEGRATION RELAY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1B-8 - Body ground Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  19

  19. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the I85 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1A-11 - I85-12 (HRY2) Always Below 1 Ω
      1A-11 or I85-12 (HRY2) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [01/2019 - 03/2019] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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