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Home >> Toyota >> 2012 >> Prius V >> 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 >> Procedure

DTC B2430: LED Headlight LH Circuit Malfunction; DTC B2431: LED Headlight RH Circuit Malfunction: Procedure

  1. CHECK FOR DTC 
    1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
    2. Check for DTCs. Refer to DTC CHECK / CLEAR .
      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 → See step   2 

    C → See step   6 

    A → See step   16 

  2. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - AUXILIARY BATTERY AND BODY GROUND) 
    1. Disconnect the 1H No. 1 integration relay connector.
    2. Measure the voltage and resistance according to the value(s) in the table below.

      Standard Voltage

      Tester Connector Condition Specified Condition
      1H-7 (BATT) - Body ground Power switch off 11 to 14 V

      Standard Resistance

      Tester Connection Condition Specified Condition
      1H-3 (GND2) - Body ground Always Below 1 Ω
    3. Disconnect the 1G integration relay connector.
    4. 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

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  3. 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) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly. Refer to REMOVAL .
      Fig 1: Inspecting Instrument Panel Junction Block Assembly With 2C & MB Connector End Views
      GTY341045Courtesy 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
      2C-32 - MB-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)

    NG → See step   14 

    OK: Go to next step 

  5. REPLACE NO. 1 INTEGRATION RELAY 
    1. Temporarily replace the No. 1 integration relay with a new or normally functioning one. Refer to REMOVAL .
    2. Check for DTC. Refer to DTC CHECK / CLEAR .

      OK

      DTC B2430 and B2431 are not output.

    NG → See step   15 

    OK → END (NO. 1 INTEGRATION RELAY WAS DEFECTIVE) 

  6. INSPECT HEADLIGHT ASSEMBLY 
    1. Disconnect the A10 or A39 headlight assembly connector.
      Fig 2: Inspecting Headlight Assembly With A10 & A39 Connector End Views
      GTY327227Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      LH SIDE (B2430)

      Tester Connection Switch Condition Specified Condition
      A10-3 (LO) - Body ground Light control switch in head position 11 to 14 V
      RH SIDE (B2431)

      Tester Connection Switch Condition Specified Condition
      A39-3 (LO) - Body ground Light control switch in head position 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Headlight Assembly LH)
      *b Front view of wire harness connector
      (to Headlight Assembly RH)

    NG → See step   10 

    OK: Go to next step 

  7. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 
    1. Measure the voltage according to the value(s) in the table below.
      Fig 3: Measuring Voltage Of Headlight Assembly(s)
      GTY329105Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Voltage

      LH SIDE (B2430)

      Tester Connection Switch Condition Specified Condition
      A10-2 (PPOS) - Body ground Power switch on (IG) and light control switch in head position 11 to 14 V
      RH SIDE (B2431)

      Tester Connection Switch Condition Specified Condition
      A39-2 (PPOS) - Body ground Power switch on (IG) and light control switch in head position 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Headlight Assembly LH)
      *b Front view of wire harness connector
      (to Headlight Assembly RH)

    NG → See step   11 

    OK: Go to next step 

  8. 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 (B2430)

      Tester Connection Condition Specified Condition
      A10-1 (E) - Body ground Always Below 1 Ω
      RH SIDE (B2431)

      Tester Connection Condition Specified Condition
      A39-1 (E) - Body ground Always Below 1 Ω

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  9. REPLACE LIGHT CONTROL ECU 
    1. Temporarily replace the light control ECU with a new or normally functioning one. Refer to REMOVAL .
    2. Check for DTC. Refer to DTC CHECK / CLEAR .

      OK

      DTC B2430 or B2431 is not output.

    NG → See step   13 

    OK → END (LIGHT CONTROL ECU WAS DEFECTIVE) 

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT ASSEMBLY - NO. 1 INTEGRATION RELAY) 
    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 (B2430)

      Tester Connection Condition Specified Condition
      1G-2 (HLPL) - A10-3 (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) - A39-3 (LO) Always Below 1 Ω
      1G-1 (HLPR) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   12 

  11. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - HEADLIGHT ASSEMBLY) 
    1. Disconnect the L8 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 (B2430)

      Tester Connection Condition Specified Condition
      L8-21 (LLEW) - A10-2 (PPOS) Always Below 1 Ω
      L8-21 (LLEW) - Body ground Always 10 kΩ or higher
      RH SIDE (B2431)

      Tester Connection Condition Specified Condition
      L8-5 (RLEW) - A39-2 (PPOS) Always Below 1 Ω
      L8-5 (RLEW) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   15 

  12. REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL 
  13. REPLACE HEADLIGHT UNIT. Refer to  REMOVAL 
  14. REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL 
  15. REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL 
  16. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
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