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Home >> Lexus >> 2021 >> LS 500 Base, RWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Rear Seat Entertainment System - Diagnostic Codes, Circuit & Symptom Tests >> Rear Seat Entertainment System >> DTC B154A-87: Seatback Display RH Missing Message; DTC B154B-87: Seatback Display LH Missing Message [10/2022 - ] >> Procedure

DTC B154A-87: Seatback Display RH Missing Message; DTC B154B-87: Seatback Display LH Missing Message [10/2022 - ]: Procedure

  1. CLEAR DTC 

    Body Electrical > Navigation System > Clear DTCs 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  2

  2. CHECK FOR DTC 

    Pre-procedure1

    1. Turn the ignition switch off and back to ON.

      Procedure1

    2. Recheck for DTCs and check if the same DTC is output again.

      Body Electrical > Navigation System > Trouble Codes 

      Result

      Result Proceed to
      DTC are not output A
      DTCs are output B

      Post-procedure1

    3. None

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2023 - ] 

    Result: 

    B 

    See step  3

  3. CHECK OPERATION 
    1. Check which multi information display assembly does not operate.

      Result

      Result Proceed to
      Television display assembly LH does not operate. A
      Television display assembly RH does not operate. B

    Result: 

    B 

    See step  9

    Result: 

    A 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (TELEVISION DISPLAY ASSEMBLY LH - BATTERY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the L141 television display assembly LH connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      L141-10 (GND4) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      L141-6 (+B) - L141-10 (GND4) Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY - TELEVISION DISPLAY ASSEMBLY LH) 

    Pre-procedure1

    1. Disconnect the L137 multi-display controller sub-assembly connector.
    2. Disconnect the L141 television display assembly LH connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      L137-12 (TX2+) - L141-3 Always Below 1 Ω
      L137-13 (TX2-) - L141-4 Always Below 1 Ω
      L137-12 (TX2+) - Body ground Always 10 kΩ or higher
      L137-13 (TX2-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. REPLACE TELEVISION DISPLAY ASSEMBLY LH 
    1. Replace the television display assembly LH.

      HINT: 

      Refer to REMOVAL [12/2017 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. CLEAR DTC 

    Body Electrical > Navigation System > Clear DTCs 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK FOR DTC 

    Pre-procedure1

    1. Turn the ignition switch off and back to ON.

      Post-procedure1

    2. Recheck for DTCs and check if the same DTC is output again.

      Body Electrical > Navigation System > Trouble Codes 

      Result

      Result Proceed to
      DTC are not output A
      DTCs are output B

      Procedure1

    3. None

    Result: 

    A 

    END (TELEVISION DISPLAY ASSEMBLY LH IS DEFECTIVE) 

    Result: 

    B 

    REPLACE MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

  9. CHECK HARNESS AND CONNECTOR (TELEVISION DISPLAY ASSEMBLY RH - BATTERY AND BODY GROUND) 

    Pre-procedure1

    1. Disconnect the L142 television display assembly RH connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      L142-10 (GND4) - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      L142-6 (+B) - L142-10 (GND4) Always 11 to 14 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY - TELEVISION DISPLAY ASSEMBLY RH) 

    Pre-procedure1

    1. Disconnect the L137 multi-display controller sub-assembly connector.
    2. Disconnect the L142 television display assembly RH connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      L137-10 (TX1+) - L142-3 Always Below 1 Ω
      L137-11 (TX1-) - L142-4 Always Below 1 Ω
      L137-10 (TX1+) - Body ground Always 10 kΩ or higher
      L137-11 (TX1-) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. REPLACE TELEVISION DISPLAY ASSEMBLY RH 
    1. Replace the television display assembly RH.

      HINT: 

      Refer to REMOVAL [12/2017 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  12

  12. CLEAR DTC 

    Body Electrical > Navigation System > Clear DTCs 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  13

  13. CHECK FOR DTC 

    Pre-procedure1

    1. Turn the ignition switch off and back to ON.

      Procedure1

    2. Recheck for DTCs and check if the same DTC is output again.

      Body Electrical > Navigation System > Trouble Codes 

      Result

      Result Proceed to
      DTC are not output A
      DTCs are output B

      Post-procedure1

    3. None

    Result: 

    A 

    END (TELEVISION DISPLAY ASSEMBLY RH IS DEFECTIVE) 

    Result: 

    B 

    REPLACE MULTI-DISPLAY CONTROLLER SUB-ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

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