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HOMESERVICE MANUALSTOYOTA2025SEQUOIA CAPSTONEREPAIR AND DIAGNOSISELECTRICALBODY ELECTRICALPOWER INTEGRATION SYSTEM - DIAGNOSTICS - INTRODUCTIONPOWER INTEGRATION SYSTEMHOW TO PROCEED WITH TROUBLESHOOTING [09/2022 - ]PROCEDURE
2025 Toyota Sequoia Capstone

How To Proceed With Troubleshooting [09/2022 - ]: Procedure

2025 Toyota Sequoia CapstoneSECTION Procedure
  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 ignition switch off.

      Standard voltage

      11 to 14 V

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

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

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

      Result

      Proceed to
      No DTCs output
      DTCs output

    Result: 

    DTCs output 

    GO TO CXPI COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2022 - ] 

    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.
    2. Clear the DTCs.
      1. Semiconductor power integration ECU

        Body Electrical > Power Integration No. 1 > Clear DTCs 

      2. power distribution box assembly

        Body Electrical > Power Distribution Box > Clear DTCs 

    3. Recheck for DTCs.
      1. Semiconductor power integration ECU

        Body Electrical > Power Integration No. 1 > Trouble Codes 

      2. power distribution box assembly

        Body Electrical > Power Distribution Box > 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 [09/2022 - ]  

    Result: 

    No DTCs output 

    See step  5

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

      Refer to PROBLEM SYMPTOMS TABLE [09/2022 - ] 

      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 [09/2022 - ] 

    2. Terminals of ECU

      Refer to TERMINALS OF ECU [09/2022 - ] 

    3. Problem symptoms table

      Refer to PROBLEM SYMPTOMS TABLE [09/2022 - ] 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  7

  7. ADJUST, REPAIR OR REPLACE 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    END 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.