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TRAIL Switch Circuit [11/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Toyota Highlander and 2024 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. READ VALUE USING GTS (CAN BUS CHECK) 

    See step  2

    Result

    Result Proceed to
    All of the ECUs and sensors that are currently connected to the CAN communication system are displayed A
    None of the ECUs and sensors that are currently connected to the CAN communication system are displayed, or some of them are not displayed B

    Result: 

    B 

    GO TO CAN COMMUNICATION SYSTEM 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ]

    Result: 

    A 

    See step  2

  2. CHECK DTC OUTPUT (HEALTH CHECK) 

    See step  3

    Result

    Result Proceed to
    No DTCs are output A
    DTCs are output B

    Result: 

    B 

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

    Result: 

    A 

    See step  3

  3. READ VALUE USING GTS (AUTO LSD SWITCH) 
    1. Read the Data List using the GTS.

      Powertrain > Hybrid Control > Data List 

      Tester Display
      Auto LSD Switch

      Result

      Result Proceed to
      GTS display changes according to TRAIL mode switch operation A
      GTS display does not change according to TRAIL mode switch operation B
    2. Turn the ignition switch off.

    Result: 

    A 

    GO TO PROBLEM SYMPTOMS TABLES 

    Refer to PROBLEM SYMPTOMS TABLE [11/2023 - ]

    Result: 

    B 

    See step  4

  4. INSPECT TRAIL MODE SWITCH (PATTERN SELECT SWITCH) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE TRAIL MODE SWITCH (PATTERN SELECT SWITCH) 

    Refer to REMOVAL [12/2019 - ]

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (TRAIL MODE SWITCH - BODY GROUND) 
    1. Disconnect the P8 TRAIL mode switch (pattern select switch) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      P8-2 (E) - Body ground Always Below 1 Ω
    3. Reconnect the P8 TRAIL mode switch (pattern select switch) connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - TRAIL MODE SWITCH) 
    1. Disconnect the H67 hybrid vehicle control ECU connector.
    2. Disconnect the P8 TRAIL mode switch (pattern select switch) connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H67-51 (ALSD) - P8-5 (B) Always Below 1 Ω
      H67-51 (ALSD) or P8-5 (B) - Body ground Always 10 kΩ or higher
    4. Reconnect the P8 TRAIL mode switch (pattern select switch) connector.
    5. Reconnect the H67 hybrid vehicle control ECU connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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