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How To Proceed With Troubleshooting [11/2021 - 10/2023]: Procedure

WARNING: This page is about a different car, the 2024 Lexus LS 500h, 2023 Lexus LS 500h, and 2022 Lexus LS 500h. However, it is still accessible from the selected car via links, so may be relevant.
  1. VEHICLE BROUGHT TO WORKSHOP 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  2

  2. INSPECT AUXILIARY BATTERY VOLTAGE 
    1. Measure the auxiliary battery voltage with the power switch off.

      Standard voltage

      11 to 14 V

      If the voltage is below 11 V, recharge or replace the auxiliary battery before proceeding to the next step.

    2. Check the fuses and relays.
    3. Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK CAN COMMUNICATION SYSTEM 
    1. Check if the CAN communication system is functioning normally.

      HINT: 

      Refer to CAN Bus Check in CAN Communication System.

      Refer to DIAGNOSIS SYSTEM [11/2021 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 10/2023]

      OK

      CAN communication system is functioning normally.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2023] 

    Result: 

    OK 

    See step  4

  4. CHECK DTC* 

    HINT: 

    Refer to DTC Check / Clear.

    Refer to DTC CHECK / CLEAR [11/2021 - ] 

    1. Check for DTCs and note any codes that are output.

      Chassis > Driver Monitor Camera Control > Trouble Codes 

    2. Clear the DTCs.

      Chassis > Driver Monitor Camera Control > Clear DTCs 

    3. Recheck for DTCs. Try to reproduce the DTCs by duplicating the conditions indicated by the DTCs.

      Chassis > Driver Monitor Camera Control > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output (Fault can be simulated) A
      DTCs are not output (Fault cannot be simulated) B
      DTCs are output. C

    Result: 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023] 

    Result: 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 10/2023]  

    Result: 

    See step  5

  5. CHECK FOR VEHICLE CONTROL HISTORY (RoB) 
    1. Check for vehicle control history (RoB) and note any codes that are output.

      Chassis > Driver Monitor Camera Control > Utility 

      Tester Display
      Vehicle Control History (RoB)
    2. If the vehicle control history (RoB) is output, record it.

      Result

      Result Proceed to
      Vehicle control history (RoB) is not output A
      Vehicle control history (RoB) is output B

    Result: 

    GO TO VEHICLE CONTROL HISTORY (RoB). Refer to  VEHICLE CONTROL HISTORY (RoB) [11/2021 - ] 

    Result: 

    See step  6

  6. PROBLEM SYMPTOMS TABLE 
    1. Refer to Problem Symptoms Table.

      Refer to PROBLEM SYMPTOMS TABLE [11/2021 - ] 

      Result

      Result Proceed to
      Fault is not listed in Problem Symptoms Table. A
      Fault is listed in Problem Symptoms Table. B

    Result: 

    ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE 

    Result: 

    See step  7

  7. PERFORM TROUBLESHOOTING 
    1. Data List / Active Test

      Refer to DATA LIST / ACTIVE TEST [11/2021 - ] 

    2. Refer to Terminals of ECU.

      Refer to TERMINALS OF ECU [11/2021 - ] 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. ADJUST, REPAIR OR REPLACE 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  9

  9. CONFIRMATION TEST 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    END