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Home >> Lexus >> 2021 >> UX 200 Luxury >> Repair and Diagnosis >> Accessories & Equipment >> Exterior Lights >> Lighting System (Exterior) (Diagnostic Codes) (1 Of 2) >> Lighting System >> DTC B242F: Open in B Power Line [10/2018 - 07/2022] >> Procedure

DTC B242F: Open in B Power Line [10/2018 - 07/2022]: Procedure

  1. CONFIRM MODEL 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for Triple Beam Headlight A
      for Single Beam Headlight B

    Result: 

    B 

    See step  4

    Result: 

    A 

    See step  2

  2. 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 / AFS or AFS (Sub) / Trouble Codes.
    5. Clear the DTCs.

      Body Electrical > AFS > Clear DTCs 

      Body Electrical > AFS (Sub) > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK FOR DTC 
    1. Wait 10 seconds or more.
    2. Enter the following menus: Body Electrical / AFS or AFS (Sub) / Trouble Codes.
    3. Check for DTCs.

      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 No. 1 headlight ECU sub-assembly LH) B
      NG (DTC output from No. 1 headlight ECU sub-assembly RH) C

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ] 

    Result: 

    B 

    See step  6

    Result: 

    C 

    See step  13

  4. 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 / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.
    5. Clear the DTCs.

      Body Electrical > HL AutoLeveling > Clear DTCs 

      Body Electrical > HL AutoLeveling (Sub) > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  5

  5. CHECK FOR DTC 
    1. Wait 10 seconds or more.
    2. Enter the following menus: Body Electrical / HL AutoLeveling or HL AutoLeveling (Sub) / Trouble Codes.
    3. Check for DTCs.

      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

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - ] 

    Result: 

    C 

    See step  13

    Result: 

    B 

    See step  6

  6. INSPECT NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH (ECUB TERMINAL VOLTAGE) 
    GTY821680Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to No. 1 headlight ECU sub-assembly LH)
    1. 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
      A15-13 (ECUB) - Body ground Ignition switch ON, Light control switch in head position 9.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A15-12 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH. Refer to  REMOVAL [10/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  8. INSPECT NO. 1 INTEGRATION RELAY 
    1. Remove the No. 1 integration relay from the No. 1 engine room relay block.

      Refer to REMOVAL [10/2018 - 07/2022]

    2. Inspect the No. 1 integration relay.

      Refer to INSPECTION [10/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY LH) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR HV MODEL

      Tester Connection Condition Specified Condition
      2B-1 - A15-13 (ECUB) Always Below 1 Ω
      2B-1 or A15-13 (ECUB) - Body ground Always 10 kΩ or higher
      FOR GASOLINE MODEL

      Tester Connection Condition Specified Condition
      1B-1 - A15-13 (ECUB) Always Below 1 Ω
      1B-1 or A15-13 (ECUB) - Body ground Always 10 kΩ or higher

      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 (H-LP LH RELAY) - AUXILIARY BATTERY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR HV MODEL

      Tester Connection Switch Condition Specified Condition
      2A-5 - Body ground Ignition switch off 11 to 14 V
      FOR GASOLINE MODEL

      Tester Connection Condition Specified Condition
      1A-5 - Body ground Always 11 to 14 V
      GTY822885Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for HV Model
      *B for Gasoline Model
      *a Component without harness connected
      (to No. 1 Integration Relay)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the 4C instrument panel junction block assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR HV MODEL

      Tester Connection Condition Specified Condition
      2B-2 - 4C-31 Always Below 1 Ω
      2B-2 or 4C-31 - Body ground Always 10 kΩ or higher
      FOR GASOLINE MODEL

      Tester Connection Condition Specified Condition
      1B-2 - 4C-31 Always Below 1 Ω
      1B-2 or 4C-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  12

  12. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 
    1. Remove the instrument panel junction block assembly.

      Refer to REMOVAL [10/2018 - 07/2022]

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

      Refer to REMOVAL [10/2018 - 07/2022]

    3. Measure the resistance according to the value(s) in the table below.
      GTY809889Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Instrument Panel Junction Block Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      4C-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 [10/2018 - 07/2022] 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2018 - 07/2022] 

  13. INSPECT NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH (ECUB TERMINAL VOLTAGE) 
    GTY821679Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to No. 1 headlight ECU sub-assembly RH)
    1. 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
      A16-13 (ECUB) - Body ground Ignition switch ON, Light control switch in head position 9.5 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH - BODY GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A16-12 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH. Refer to  REMOVAL [10/2018 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  15. INSPECT NO. 1 INTEGRATION RELAY 
    1. Remove the No. 1 integration relay from the No. 1 engine room relay block.

      Refer to REMOVAL [10/2018 - 07/2022]

    2. Inspect the No. 1 integration relay.

      Refer to INSPECTION [10/2018 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE NO. 1 INTEGRATION RELAY. Refer to  REMOVAL [10/2018 - 07/2022] 

    Result: 

    OK 

    See step  16

  16. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - NO. 1 HEADLIGHT ECU SUB-ASSEMBLY RH) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR HV MODEL

      Tester Connection Condition Specified Condition
      2A-12 - A16-13 (ECUB) Always Below 1 Ω
      2A-12 or A16-13 (ECUB) - Body ground Always 10 kΩ or higher
      FOR GASOLINE MODEL

      Tester Connection Condition Specified Condition
      1A-12 - A16-13 (ECUB) Always Below 1 Ω
      1A-12 or A16-13 (ECUB) - 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. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY (H-LP RH RELAY) - AUXILIARY BATTERY) 
    1. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      FOR HV MODEL

      Tester Connection Switch Condition Specified Condition
      2B-8 - Body ground Ignition switch off 11 to 14 V
      FOR GASOLINE MODEL

      Tester Connection Condition Specified Condition
      1B-8 - Body ground Always 11 to 14 V
      GTY817416Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A for HV Model
      *B for Gasoline Model
      *a Component without harness connected
      (to No. 1 Integration Relay)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  18

  18. CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 
    1. Disconnect the F40 main body ECU (multiplex network body ECU) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR HV MODEL

      Tester Connection Condition Specified Condition
      2A-11 - F40-12 (HRY2) Always Below 1 Ω
      2A-11 or F40-12 (HRY2) - Body ground Always 10 kΩ or higher
      FOR GASOLINE MODEL

      Tester Connection Condition Specified Condition
      1A-11 - F40-12 (HRY2) Always Below 1 Ω
      1A-11 or F40-12 (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 [10/2018 - 07/2022] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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