LIGHTING SYSTEM, Diagnostic DTC:B242F

DTC Code DTC Name
B242F Open in B Power Line

DESCRIPTION

The headlight ECU sub-assembly operates using the power source voltage input from the IG terminal and ECUB terminal.

The power source voltage of the ECUB terminal is supplied when the main body ECU (multiplex network body ECU) turns the ECUB power supply relay (No. 1 semiconductor power integration ECU) to ON.

The headlight ECU sub-assembly compares the power source voltage supply condition of the IG terminal and ECUB terminal and monitors the result.

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from Note
B242F Open in B Power Line

    Detection condition:

  • Engine switch on (IG)


    Malfunction status:

  • No power source voltage supplied to ECUB terminal while power source voltage being supplied to IG terminal


    Malfunction duration:

  • 10 seconds or more

  • Headlight ECU sub-assembly LH

  • Headlight ECU sub-assembly RH

  • No. 1 semiconductor power integration ECU

  • Main body ECU (multiplex network body ECU)

  • Instrument panel junction block assembly

  • Harness or connector

  • Headlight ECU sub-assembly LH

  • Headlight ECU sub-assembly RH

 -

WIRING DIAGRAM

B006D9YE05

CAUTION / NOTICE / HINT

Note


  • If the headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information and initialize the headlight ECU sub-assembly LH.

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), refer to Service Bulletin.

  • First, confirm that there is no malfunction in the power integration system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work.

    Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > AFS > Clear DTCs
      Body Electrical > AFS (Sub) > Clear DTCs

    2. Turn the engine switch on (IG) and wait for at least 10 seconds or more.

    3. Check for DTCs.

      Click here


      Body Electrical > AFS > Trouble Codes
      Body Electrical > AFS (Sub) > Trouble Codes
      OK
      DTC B242F is not output.
      Result
      Result Proceed to
      OK A
      NG (DTC output from headlight ECU sub-assembly LH) B
      NG (DTC output from headlight ECU sub-assembly RH) C

    A

    USE SIMULATION METHOD TO CHECK Click here

    C

    READ VALUE USING GTS Click here

    B

  2. READ VALUE USING GTS


    1. Turn the engine switch on (IG).

    2. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Headlight ECU LH Fuse Headlight ECU sub-assembly LH fuse condition Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Status of Headlight ECU LH Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    OK

  3. READ VALUE USING GTS


    1. Turn the engine switch on (IG).

    2. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Headlight ECU LH Input Signal Headlight ECU sub-assembly LH input OFF or ON

      OFF: Headlight ECU sub-assembly LH is not input

      ON: Headlight ECU sub-assembly LH is input

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Headlight ECU LH Input Signal
      OK
      The Data List value displays "ON".
      Result
      Proceed to
      OK
      NG

    NG

    CHECK NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  4. READ VALUE USING GTS


    1. Turn the engine switch on (IG).

    2. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Headlight ECU LH Output Signal Headlight ECU sub-assembly LH output OFF or ON

      OFF: Headlight ECU sub-assembly LH has no power supply

      ON: Headlight ECU sub-assembly LH has power supply

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Headlight ECU LH Output Signal
      OK
      The Data List value displays "ON".
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - BATTERY)


    1. Disconnect the A31 headlight ECU sub-assembly LH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A31-13 (ECUB) - Body ground Engine switch on (IG) 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

  6. CHECK HEADLIGHT ECU SUB-ASSEMBLY LH


    1. Disconnect the A31 headlight ECU sub-assembly LH connector.

    2. Turn the engine switch off and wait for at least 15 seconds.

    3. Turn the engine switch on (IG).

    4. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Headlight ECU LH Fuse Headlight ECU sub-assembly LH fuse condition Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Status of Headlight ECU LH Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

  7. CHECK NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU


    1. B006FGCC04
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      5F-19 - Body ground Always 6 to 14 V
      for RHD
      Tester Connection Condition Specified Condition
      5F-20 - Body ground Always 6 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

    OK

  8. CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY


    1. Remove the instrument panel junction block assembly.

      Click here

      B006FGLC03
      *a

      Component without harness connected

      (Instrument Panel Junction Block Assembly)

      		 - -

    2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

      Click here

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      5F-19 - A-15 (HRLY) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      5F-20 - A-15 (HRLY) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A31 headlight ECU sub-assembly LH connector.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A61-1 (L) - A31-13 (ECUB) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY LH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A31 headlight ECU sub-assembly LH connector.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A61-1 (L) or A31-13 (ECUB) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the 5F instrument panel junction block assembly connector.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      5F-19 - A61-15 (-S) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      5F-20 - A61-15 (-S) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. READ VALUE USING GTS


    1. Turn the engine switch on (IG).

    2. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Headlight ECU RH Fuse Headlight ECU sub-assembly RH fuse condition Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Status of Headlight ECU RH Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    OK

  13. READ VALUE USING GTS


    1. Turn the engine switch on (IG).

    2. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Headlight ECU RH Input Signal Headlight ECU sub-assembly RH input OFF or ON

      OFF: Headlight ECU sub-assembly RH is not input

      ON: Headlight ECU sub-assembly RH is input

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Headlight ECU RH Input Signal
      OK
      The Data List value displays "ON".
      Result
      Proceed to
      OK
      NG

    NG

    CHECK NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  14. READ VALUE USING GTS


    1. Turn the engine switch on (IG).

    2. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Headlight ECU RH Output Signal Headlight ECU sub-assembly RH output OFF or ON

      OFF: Headlight ECU sub-assembly RH has no power supply

      ON: Headlight ECU sub-assembly RH has power supply

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Headlight ECU RH Output Signal
      OK
      The Data List value displays "ON".
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  15. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - BATTERY)


    1. Disconnect the A32 headlight ECU sub-assembly RH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A32-13 (ECUB) - Body ground Engine switch on (IG) 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

  16. CHECK HEADLIGHT ECU SUB-ASSEMBLY RH


    1. Disconnect the A32 headlight ECU sub-assembly RH connector.

    2. Turn the engine switch off and wait for at least 15 seconds.

    3. Turn the engine switch on (IG).

    4. Using the GTS, read the Data List.

      Click here


      Body Electrical > Power Integration No.1 > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Status of Headlight ECU RH Fuse Headlight ECU sub-assembly RH fuse condition Connect or Disconnect

      Connect: Fuse not shut off

      Disconnect: Fuse shut off

      		 -

      Body Electrical > Power Integration No.1 > Data List
      Tester Display
      Status of Headlight ECU RH Fuse
      OK
      The Data List value displays "Connect".
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

  17. CHECK NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU


    1. Disconnect the G12 main body ECU (multiplex network body ECU) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G12-12 (HRY2) - Body ground Always 6 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU) Click here

  18. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A32 headlight ECU sub-assembly RH connector.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A61-2 (HI) - A32-13 (ECUB) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  19. CHECK HARNESS AND CONNECTOR (HEADLIGHT ECU SUB-ASSEMBLY RH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A32 headlight ECU sub-assembly RH connector.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A61-2 (HI) or A32-13 (ECUB) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU] - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the G12 main body ECU (multiplex network body ECU) connector.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Disconnect the A61 No. 1 semiconductor power integration ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G12-12 (HRY2) - A61-14 (-S) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR