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HOMESERVICE MANUALSTOYOTA2025HIGHLANDER XLE, FWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTANTI-THEFT SYSTEMSPOWER DOOR LOCK CONTROL SYSTEM - DIAGNOSTICS - INTRODUCTIONPOWER DOOR LOCK CONTROL SYSTEMHOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 11/2023]PROCEDURE
2025 Toyota Highlander XLE, FWD

How To Proceed With Troubleshooting [12/2019 - 11/2023]: Procedure

2025 Toyota Highlander XLE, FWDSECTION Procedure
  1. VEHICLE BROUGHT TO WORKSHOP 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  2

  2. CUSTOMER PROBLEM ANALYSIS CHECK 

    HINT: 

    • In troubleshooting, confirm that the problem symptoms have been accurately identified. Preconceptions should be discarded in order to make an accurate judgment. To clearly understand what the problem symptoms are, it is extremely important to ask the customer about the problem and the conditions at the time the malfunction occurred.
    • Gather as much information as possible for reference. Past problems that seem unrelated may also help in some cases.
    • The following 5 items are important points for problem analysis:
    What Vehicle model, system name
    When Date, time, occurrence frequency, whether the problem occurred recently or has been occurring for a long time
    Where Whether the problem occurs at a specific location
    Under what conditions? Whether the doors were locked or unlocked, whether the ignition switch was ON, whether the hybrid control system*1 or engine*2 has started.
    How did it happen? Problem symptoms
    1. *1: for HV Model
    2. *2: for Gasoline Model

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  3

  3. READ AND SAVE OPERATION HISTORY 
    NOTE:
    • If the vehicle or vehicle controls are operated (for example, during initial inspection when the vehicle is brought in for repair) before operation history has been read and saved, the operation history information could be lost.
    • The operation history function uses the current system time of the GTS and the time counter inside the controlling ECU to calculate the times shown in the operation history. For this reason, before reading the operation history, first make sure that the GTS system clock is accurately set to the current time.
    1. Read and save operation history using the GTS.

      Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2019 - 11/2023] 

      Body Electrical > Main Body > Utility 

      Tester Display
      Operation History

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  4

  4. PRE-CHECK 
    1. Measure the auxiliary battery voltage with the ignition switch off.*1
    2. Measure the auxiliary battery voltage.*2
      1. *1: for HV Model
      2. *2: for Gasoline Model

      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.

    3. Check the fuses and relays.
    4. 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  5

  5. CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM* 
    1. Using the GTS, check for CAN communication system DTCs.

      for HV Model: Refer to DIAGNOSIS SYSTEM [12/2019 - 09/2020] , or refer to DIAGNOSIS SYSTEM [09/2020 - 10/2021] , or refer to DIAGNOSIS SYSTEM [10/2021 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 11/2023]

      for Gasoline Model: Refer to DIAGNOSIS SYSTEM [12/2019 - 09/2020] , or refer to DIAGNOSIS SYSTEM [09/2020 - 10/2022] , or refer to DIAGNOSIS SYSTEM [10/2022 - 11/2023]

      Result

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

    Result: 

    B 

    GO TO CAN COMMUNICATION SYSTEM 

    for HV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2021 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 11/2023]

    for Gasoline Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 11/2023]

    Result: 

    A 

    See step  6

  6. CHECK COMMUNICATION FUNCTION OF LIN COMMUNICATION SYSTEM* 
    1. Using the GTS, check for LIN communication system DTCs.

      Refer to DTC CHECK / CLEAR [12/2019 - 11/2023]

      Result

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

    Result: 

    B 

    GO TO LIN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 11/2023] 

    Result: 

    A 

    See step  7

  7. CHECK FOR DTC (MULTIPLEX NETWORK MASTER SWITCH ASSEMBLY)* 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [12/2019 - ]

      Body Electrical > Master Switch > Clear DTCs 

    2. Recheck for DTCs.

      Body Electrical > Master Switch > Trouble Codes 

      Result

      Result Proceed to
      DTC B2312 is not output A
      DTC B2312 is output B

    Result: 

    B 

    GO TO POWER WINDOW CONTROL SYSTEM. Refer to  DTC B2312: Power Window Switch Malfunction [12/2019 - ] 

    Result: 

    A 

    See step  8

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

      Refer to PROBLEM SYMPTOMS TABLE [12/2019 - 11/2023] 

      Result

      Result Proceed to
      Fault is not listed in Problem Symptoms Table (Fault can be simulated) A
      Fault is not listed in Problem Symptoms Table (Fault cannot be simulated) B
      Fault is listed in Problem Symptoms Table C

    Result: 

    B 

    CHECK FOR INTERMITTENT PROBLEMS. Refer to  CHECK FOR INTERMITTENT PROBLEMS [12/2019 - 11/2023]  

    Result: 

    C 

    See step  10

    Result: 

    A 

    See step  9

  9. OVERALL ANALYSIS AND TROUBLESHOOTING* 
    1. Terminals of ECU

      Refer to TERMINALS OF ECU [12/2019 - 11/2023] 

    2. Data List / Active Test

      Refer to DATA LIST / ACTIVE TEST [12/2019 - 11/2023] 

    3. Operation Check

      Refer to OPERATION CHECK [12/2019 - 11/2023] 

    4. Inspection

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  10

  10. REPAIR OR REPLACE 

    Result

    Proceed to
    NEXT

    Result: 

    NEXT 

    See step  11

  11. CONFIRMATION TEST 

    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.