LIGHTING SYSTEM, Diagnostic DTC:B242F

DTC Code DTC Name
B242F Open in B Power Line

DESCRIPTION

The No. 1 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 No. 1 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
B242F Open in B Power Line

    Detection condition:

  • Power 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

  • No. 1 headlight ECU sub-assembly LH

  • No. 1 headlight ECU sub-assembly RH

  • No. 1 semiconductor power integration ECU

  • Main body ECU (multiplex network body ECU)

  • Harness or connector

  • No. 1 headlight ECU sub-assembly LH

  • No. 1 headlight ECU sub-assembly RH

WIRING DIAGRAM

B004AYUE02

CAUTION / NOTICE / HINT

Note


  • If the No. 1 headlight ECU sub-assembly LH has been replaced, it is necessary to synchronize the vehicle information.

    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 power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here

  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Clear DTCs
      Body Electrical > HL AutoLeveling (Sub) > Clear DTCs

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

    3. Check for DTCs.

      Click here


      Body Electrical > HL AutoLeveling > Trouble Codes
      Body Electrical > HL AutoLeveling (Sub) > Trouble Codes
      OK
      DTC B242F is not output.
      Result
      Result Proceed to
      OK A
      NG (DTC output from No. 1 headlight ECU sub-assembly LH) B
      NG (DTC output from No. 1 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 power 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 No. 1 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 NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    OK

  3. READ VALUE USING GTS


    1. Turn the power 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 No. 1 headlight ECU sub-assembly LH input OFF or ON

      OFF: No. 1 headlight ECU sub-assembly LH is not input

      ON: No. 1 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 power 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 No. 1 headlight ECU sub-assembly LH output OFF or ON

      OFF: No. 1 headlight ECU sub-assembly LH has no power supply

      ON: No. 1 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 (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - BATTERY)


    1. B004BPXC82
      *a

      Front view of wire harness connector

      (to No. 1 Headlight ECU Sub-assembly LH)

      Disconnect the No. 1 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
      A36-13 (ECUB) - Body ground Power switch on (IG) 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    NG

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

  6. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH


    1. Disconnect the A36 No. 1 headlight ECU sub-assembly LH connector.

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

    3. Turn the power 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 No. 1 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 NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH Click here

    NG

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

  7. CHECK NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU


    1. B004ATCC03
      *a

      Front view of wire harness connector

      (to Driver Side Junction Block Assembly)

      Disconnect the driver side junction block assembly connector.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      3C-19 - Body ground Power switch off 6 to 14 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      3C-20 - Body ground Power switch off 6 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  8. CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY


    1. Remove the driver side junction block assembly.

      Click here

      B004BBIC02
      *a

      Component without harness connected

      (Driver Side Junction Block Assembly)

      		 - -

    2. Remove the main body ECU (multiplex network body ECU) from the driver side 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
      3C-19 - A-15 (HRLY) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      3C-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 DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here

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


    1. Disconnect the A36 No. 1 headlight ECU sub-assembly LH connector.

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

    3. Disconnect the A80 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
      A80-1 (L) - A36-13 (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 (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A36 No. 1 headlight ECU sub-assembly LH connector.

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

    3. Disconnect the A80 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
      A80-1 (L) or A36-13 (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 (DRIVER SIDE JUNCTION BLOCK ASSEMBLY - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the 3C driver side junction block assembly connector.

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

    3. Disconnect the A80 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
      3C-19 - A80-15 (-S) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      3C-20 - A80-15 (-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 power 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 No. 1 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 NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    OK

  13. READ VALUE USING GTS


    1. Turn the power 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 No. 1 headlight ECU sub-assembly RH input OFF or ON

      OFF: No. 1 headlight ECU sub-assembly RH is not input

      ON: No. 1 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 power 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 No. 1 headlight ECU sub-assembly RH output OFF or ON

      OFF: No. 1 headlight ECU sub-assembly RH has no power supply

      ON: No. 1 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 REPLACE NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU Click here

    OK

  15. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH - BATTERY)


    1. B004BPXC81
      *a

      Front view of wire harness connector

      (to No. 1 Headlight ECU Sub-assembly RH)

      Disconnect the No. 1 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
      A37-13 (ECUB) - Body ground Power switch on (IG) 9.5 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    NG

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

  16. CHECK NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH


    1. Disconnect the A37 No. 1 headlight ECU sub-assembly RH connector.

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

    3. Turn the power 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 No. 1 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 NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH Click here

    NG

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

  17. CHECK NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU


    1. B004BNLC03
      *a

      Front view of wire harness connector

      (to Main Body ECU [Multiplex Network Body ECU])

      Disconnect the 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 Switch Condition Specified Condition
      P7-12 (HRY2) - Body ground Power switch off 6 to 14 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here 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 (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A37 No. 1 headlight ECU sub-assembly RH connector.

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

    3. Disconnect the A80 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
      A80-2 (HI) - A37-13 (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 (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH - NO. 1 SEMICONDUCTOR POWER INTEGRATION ECU)


    1. Disconnect the A37 No. 1 headlight ECU sub-assembly RH connector.

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

    3. Disconnect the A80 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
      A80-2 (HI) or A37-13 (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 P7 main body ECU (multiplex network body ECU) connector.

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

    3. Disconnect the A80 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
      P7-12 (HRY2) - A80-14 (-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