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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Anti-Theft Systems >> Smart Key System (For Start, Except HV) - Symptom Tests (2 Of 2) >> SMART KEY SYSTEM (for Start Function, Gasoline Model) >> Unable to Unlock Steering Wheel (Engine cannot Start) [12/2019 - 10/2021] >> Caution / Notice / Hint

Caution / Notice / Hint

NOTE:
  • When using the GTS with the ignition switch off, connect the GTS to the vehicle and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
  • Perform either of the following operations to lock/unlock the steering:
    • To unlock the steering, carry the key and turn the ignition switch to ACC or ON.
    • To lock the steering, turn the ignition switch off with the shift lever in P, and then open a door.
  • The smart key system (for Start Function) uses LIN communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2021]

  • After performing repairs, confirm that the problem does not recur.
  • Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart.

    Refer to DIAGNOSTIC TROUBLE CODE CHART [12/2019 - 10/2021]

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the steering lock ECU (steering lock actuator or upper bracket assembly) or certification ECU (smart key ECU assembly), refer to Registration.

    Refer to REGISTRATION [12/2019 - 10/2021]

  • When disconnecting the cable from the negative (-) auxiliary battery terminal, some systems need to be initialized after the cable is reconnected.

    Refer to INITIALIZATION [12/2019 - 09/2020] , or refer to INITIALIZATION [09/2020 - 10/2021]

  • If the steering lock ECU (steering lock actuator or upper bracket assembly) is replaced, be sure to confirm that the steering is unlocked by turning the steering wheel to the left and right before starting the engine. This function prevents the engine from starting while the steering is locked. If the steering is locked for any reason, open and close a door with the ignition switch off, and then unlock the steering by pressing the engine switch.
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