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Home >> Toyota >> 2020 >> Prius Limited >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (W/O AFS) - Diagnostic Codes & Circuit Tests >> LIGHTING SYSTEM (w/o AFS) >> DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction [11/2015 - 12/2018] >> Procedure

DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction [11/2015 - 12/2018]: Procedure

  1. CHECK FOR DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [11/2015 - 07/2020]

      Body Electrical > Main Body > Clear DTCs 

    2. Check for DTCs.

      Refer to DTC CHECK / CLEAR [11/2015 - 07/2020]

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      Both DTC B2430 and B2431 are not output. A
      Both DTC B2430 and B2431 are output. B
      Only DTC B2430 or B2431 is output. C

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - 12/2018] 

    Result: 

    C 

    See step  6

    Result: 

    B 

    See step  2

  2. INSPECT NO. 1 INTEGRATION RELAY 
    1. Remove the No. 1 integration relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      Refer to REMOVAL [11/2015 - 12/2018]

    2. Inspect the No. 1 integration relay.

      Refer to INSPECTION [11/2015 -]

      OK

      No. 1 integration relay is normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [11/2015 - 12/2018] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AUXILIARY BATTERY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1A-5 - Body ground Power switch off 11 to 14 V
      1B-8 - Body ground Power switch off 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 3F 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 - 3F-31 Always Below 1 Ω
      1B-2 or 3F-31 - Body ground Always 10 kΩ or higher
      1A-11 - 3F-31 Always Below 1 Ω
      1A-11 or 3F-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  5

  5. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [11/2015 - 12/2018]

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
      GTY591397Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (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
      3F-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 [11/2015 - 12/2018] 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [11/2015 - 12/2018] 

  6. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - HEADLIGHT ASSEMBLY) 
    1. Disconnect the A11*1 or A34*2 headlight assembly connector.
      1. *1: for LH Side
      2. *2: for RH Side
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      (A11)

      (A11)

      FOR LH SIDE (B2430)

      Tester Connection Condition Specified Condition
      A11-3 (LO) - Body ground Power switch off, light control switch in head position 11 to 14 V

      (A34)

      (A34)

      FOR RH SIDE (B2431)

      Tester Connection Condition Specified Condition
      A34-3 (LO) - Body ground Power switch off, light control switch in head position 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  11

    Result: 

    OK 

    See step  7

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

      Standard Resistance

      (A11)

      (A11)

      FOR LH SIDE (B2430)

      Tester Connection Condition Specified Condition
      A11-1 (E) - Body ground Always Below 1 Ω

      (A34)

      (A34)

      FOR RH SIDE (B2431)

      Tester Connection Condition Specified Condition
      A34-1 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      (A11)

      (A11)

      FOR LH SIDE (B2430)

      Tester Connection Condition Specified Condition
      A11-2 (S) - Body ground Power switch on (IG), light control switch in head position 11 to 14 V

      (A34)

      (A34)

      FOR RH SIDE (B2431)

      Tester Connection Condition Specified Condition
      A34-2 (S) - Body ground Power switch on (IG), light control switch in head position 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  9

  9. CHECK HEADLIGHT ASSEMBLY 
    1. Temporarily replace the headlight assembly with a new or known good one.

      Refer to REMOVAL [11/2015 - 12/2018]

    2. Check for DTCs.

      Refer to DTC CHECK / CLEAR [11/2015 - 07/2020]

      Body Electrical > Main Body > Trouble Codes 

      Result

      Result Proceed to
      Both DTC B2430 and B2431 are not output. A
      Only DTC B2430 or B2431 is output. B

    Result: 

    A 

    END (HEADLIGHT ASSEMBLY WAS DEFECTIVE) 

    Result: 

    B 

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2015 - 12/2018] 

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the F17 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      (A11)

      (F17)

      (A11)

      (F17)

      FOR LH SIDE (B2430)

      Tester Connection Condition Specified Condition
      A11-2 (S) - F17-16 (LLEW) Always Below 1 Ω
      A11-2 (S) or F17-16 (LLEW) - Body ground Always 10 kΩ or higher

      (A34)

      (F17)

      (A34)

      (F17)

      FOR RH SIDE (B2431)

      Tester Connection Condition Specified Condition
      A34-2 (S) - F17-3 (RLEW) Always Below 1 Ω
      A34-2 (S) or F17-3 (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 [11/2015 - 12/2018] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. INSPECT NO. 1 INTEGRATION RELAY 
    1. Remove the No. 1 integration relay from the No. 1 engine room relay block and No. 1 junction block assembly.

      Refer to REMOVAL [11/2015 - 12/2018]

    2. Inspect the No. 1 integration relay.

      Refer to INSPECTION [11/2015 -]

      OK

      No. 1 integration relay is normal.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (HEADLIGHT ASSEMBLY - NO. 1 INTEGRATION RELAY) 

    Result: 

    NG 

    REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [11/2015 - 12/2018] 

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