How To Proceed With Troubleshooting [11/2022 - ]: Procedure

2025 Toyota Highlander Hybrid XLESECTION Procedure
WARNING: This page is about a different car, the 2025 Toyota Corolla Cross, 2024 Toyota Corolla Cross, 2023 Toyota Corolla Cross, and 2022 Toyota Corolla Cross. 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. PRE-CHECK 
    1. Measure the auxiliary battery voltage with the ignition switch off.

      Standard voltage

      11 to 14 V

      HINT: 

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

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

      for Gasoline Model: Refer to DIAGNOSIS SYSTEM [11/2022 - 11/2023] , or refer to DIAGNOSIS SYSTEM [11/2023 - 12/2024] , or refer to DIAGNOSIS SYSTEM [12/2024 - ]

      for HEV Model: Refer to DIAGNOSIS SYSTEM [11/2022 - 12/2024] , or refer to DIAGNOSIS SYSTEM [12/2024 - ]

      Result

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

    Result: 

    GO TO CAN COMMUNICATION SYSTEM 

    for Gasoline Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2022 - 11/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - 12/2024] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2024 - ]

    for HEV Model: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2022 - 11/2023] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - 12/2024] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2024 - ]

    Result: 

    See step  4

  4. CHECK FOR DTCs* 
    1. Using the GTS, check for DTCs.

      Body Electrical > Front Radar Sensor > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTC C1A11-00 is output B
      DTCs other than C1A11-00 are output C

    Result: 

    GO TO DIAGNOSTIC TROUBLE CODE CHART (C1A11-00) 

    Refer to DTC C1A11-00: Front Radar Sensor Optical Axis Misalignment Malfunction [11/2022 - ]

    Result: 

    See step  7

    Result: 

    See step  5

  5. CHECK VEHICLE CONTROL HISTORY* 
    1. Using the GTS, check for Vehicle Control History (RoB).

      Body Electrical > Front Radar Sensor > Utility 

      Tester Display
      Vehicle Control History (RoB)
    2. Make a note of the output Vehicle Control History (RoB).

      Result

      Result Proceed to
      Vehicle Control History (RoB) codes are not output A
      Vehicle Control History (RoB) code X2024, X2025, X2026 or X2028 is output B
      Vehicle Control History (RoB) codes other than X2024, X2025, X2026 and X2028 are output C

    Result: 

    USE SIMULATION METHOD TO CHECK 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2021 - ]

    Result: 

    GO TO VEHICLE CONTROL HISTORY (X2024, X2025, X2026 or X2028) 

    Refer to VEHICLE CONTROL HISTORY (RoB) [11/2022 - ]

    Result: 

    See step  6

  6. RECONFIRM VEHICLE CONTROL HISTORY* 
    1. Using the GTS, clear the Vehicle Control History (RoB).

      Body Electrical > Front Radar Sensor > Utility 

      Tester Display
      Vehicle Control History (RoB)
    2. Using the GTS, check for Vehicle Control History (RoB).

      Body Electrical > Front Radar Sensor > Utility 

      Tester Display
      Vehicle Control History (RoB)

      Result

      Result Proceed to
      Vehicle Control History (RoB) codes are not output A
      Vehicle Control History (RoB) codes are output B

    Result: 

    USE SIMULATION METHOD TO CHECK 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2021 - ]

    Result: 

    GO TO VEHICLE CONTROL HISTORY 

    Refer to VEHICLE CONTROL HISTORY (RoB) [11/2022 - ]

  7. RECONFIRM DTC OUTPUT* 
    1. Using the GTS, clear the DTCs.

      Body Electrical > Front Radar Sensor > Clear DTCs 

    2. Reproduce the vehicle conditions that were present when the DTCs that were noted were stored.

      HINT: 

      Refer to each corresponding DTC for details on the detection conditions.

      Refer to DIAGNOSTIC TROUBLE CODE CHART [11/2022 - ] 

    3. Using the GTS, check for DTCs.

      Body Electrical > Front Radar Sensor > Trouble Codes 

      Result

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

    Result: 

    See step  5

    Result: 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2022 - ]  

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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.