LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2021 >> LC 500 2D Convertible >> Repair and Diagnosis >> Electrical >> Body Electrical >> Power Integration System - Diagnostics - Introduction (Convertible) >> Power Integration System >> How To Proceed With Troubleshooting [07/2020 - 05/2023] >> Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

How To Proceed With Troubleshooting [07/2020 - 05/2023]: Procedure

  1. VEHICLE BROUGHT TO WORKSHOP 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  2

  2. INSPECT BATTERY VOLTAGE 
    1. Measure the battery voltage with the engine switch off.

      Standard voltage

      11 to 14 V

      If the voltage is below 11 V, recharge or replace the battery before proceeding.

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK COMMUNICATION FUNCTION OF CXPI COMMUNICATION SYSTEM* 
    1. Using the Techstream, check the CXPI communication function to ensure that there are no malfunctions in the communication system.

      Refer to DTC CHECK / CLEAR [07/2020 - ]

      Result

      Proceed to
      No DTCs output
      DTCs output

    Result: 

    DTCs output 

    GO TO CXPI COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - ] 

    Result: 

    No DTCs output 

    See step  4

  4. CHECK FOR DTC* 
    1. Check for DTCs and make a note of any codes that are output.

      Refer to DTC CHECK / CLEAR [07/2020 - 05/2023] 

    2. Clear the DTCs.
      1. No. 1 semiconductor power integration ECU

        Body Electrical > Power Integration No. 1 > Clear DTCs 

      2. No. 2 semiconductor power integration ECU

        Body Electrical > Power Integration No. 3 > Clear DTCs 

    3. Recheck for DTCs.
      1. No. 1 semiconductor power integration ECU

        Body Electrical > Power Integration No. 1 > Trouble Codes 

      2. No. 2 semiconductor power integration ECU

        Body Electrical > Power Integration No. 3 > Trouble Codes 

      Result

      Proceed to
      No DTCs output
      DTCs output

    Result: 

    DTCs output 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [07/2020 - 05/2023]  

    Result: 

    No DTCs output 

    See step  5

  5. PROBLEM SYMPTOMS TABLE 
    1. Refer to the Problem Symptoms Table.

      Refer to PROBLEM SYMPTOMS TABLE [07/2020 - 05/2023] 

      Result

      Proceed to
      Fault is not listed in problem symptoms table
      Fault is listed in problem symptoms table

    Result: 

    Fault is listed in problem symptoms table 

    ADJUST, REPAIR OR REPLACE IN ACCORDANCE WITH PROBLEM SYMPTOMS TABLE 

    Result: 

    Fault is not listed in problem symptoms table 

    See step  6

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

      Refer to DATA LIST / ACTIVE TEST [07/2020 - 05/2023] 

    2. Terminals of ECU

      Refer to TERMINALS OF ECU [07/2020 - 05/2023] 

    3. Problem symptoms table

      Refer to PROBLEM SYMPTOMS TABLE [07/2020 - 05/2023] 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. ADJUST, REPAIR OR REPLACE 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    END