LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2019 >> LS 500h AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 29 (Advanced Drive System - Diagnostics - Introduction) >> Advanced Drive System >> How To Proceed With Troubleshooting [11/2021 - 10/2023] >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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 
    1. Measure the auxiliary battery voltage with the power switch off.

      Standard Voltage

      11 to 14 V

    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 (ETHERNET COMMUNICATION SYSTEM)* 

    HINT: 

    Refer to DTC Check / Clear.

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

    1. Turn the power switch on (IG) and wait for at least 5 minutes.
    2. Check for DTCs.

      Body Electrical > Ethernet Switch1 > Trouble Codes 

      Body Electrical > Ethernet Switch2 > Trouble Codes 

      Result

      Result Proceed to
      No DTCs output from Ethernet switch 1 and Ethernet switch 2 A
      DTC output from Ethernet switch 1 or Ethernet switch 2 B

    Result: 

    B 

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

    Result: 

    A 

    See step  5

  5. CHECK DTC* 

    HINT: 

    • Refer to DTC Check / Clear.

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

    • If diagnostic communication cannot be performed, there may be a power supply path malfunction (including low power supply), communication line malfunction or ECU malfunction.
    1. Turn the power switch on (IG) and wait for at least 5 minutes.
    2. Check for DTCs.

      Chassis > Advanced Drive Control > Trouble Codes 

    3. Check diagnosis related information.

      Refer to UTILITY [11/2021 - ] 

      Chassis > Advanced Drive Control > Utility 

      Tester Display
      Diagnosis Related Information

      HINT: 

      • Diagnosis related information is, for some DTCs, to store diagnosis related information that matches the symptom when it is detected that the certain symptom occurs.
      • The advanced drive system may temporarily stop advanced drive for some DTCs prior to confirming the DTC after a malfunction occurs. Also, only diagnosis related information may be stored if the DTC is not confirmed.
      • If only diagnosis related information is stored without a DTC being output, clear the stored DTC and then clear diagnosis related information.
      • When a DTC is saved to the Techstream, the diagnosis related information is also saved at the same time.
    4. Clear the DTCs

      Chassis > Advanced Drive Control > Clear DTCs 

      HINT: 

      DTCs, freeze frame data and diagnosis related information are cleared at the same time.

    5. Turn the power switch on (IG) and wait for at least 5 minutes.
    6. Recheck for DTCs.

      Chassis > Advanced Drive Control > Trouble Codes 

      Result

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

    Result: 

    B 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2021 - 10/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - 10/2023]  

    Result: 

    A 

    See step  6

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

      Chassis > Advanced Drive Control > Utility 

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

      Result

      Result Proceed to
      No vehicle control history (RoB) is output A
      Any vehicle control history (RoB) is output B

    Result: 

    B 

    GO TO VEHICLE CONTROL HISTORY (RoB). Refer to  VEHICLE CONTROL HISTORY (RoB) [11/2021 - 10/2023] 

    Result: 

    A 

    See step  7

  7. PROBLEM SYMPTOMS TABLE 

    HINT: 

    Refer to Problem Symptoms Table.

    Refer to PROBLEM SYMPTOMS TABLE [11/2021 - 10/2023] 

    Result

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

    Result: 

    B 

    GO TO PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [11/2021 - 10/2023]  

    Result: 

    A 

    See step  8

  8. OVERALL ANALYSIS AND TROUBLESHOOTING* 
    1. Data List / Active Test

      Refer to DATA LIST / ACTIVE TEST [11/2021 - 10/2022] , or refer to DATA LIST / ACTIVE TEST [10/2022 - ] 

    2. Terminals of ECU

      Refer to TERMINALS OF ECU [11/2021 - ] 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  9

  9. ADJUST, REPAIR OR REPLACE 
    NOTE:
    • When replacing the advanced drive camera, make sure to replace it with a new one.

      If an advanced drive camera that was installed in another vehicle is used, the information stored in the advanced drive camera will not match the information from the vehicle, and may cause a DTC to be output.

    • If the advanced drive camera is replaced, make sure to perform advanced drive camera beam axis adjustment and clear the vehicle control history (RoB) for each system.

      One Time Recognition: Refer to ADJUSTMENT (ONE TIME RECOGNITION) [11/2021 - ]

      Sequential Recognition: Refer to ADJUSTMENT (SEQUENTIAL RECOGNITION) [11/2021 - ]

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  10

  10. CONFIRMATION TEST 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    END 

scientia non olet · About LEMON Manuals