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Home >> Lexus >> 2024 >> NX 250 FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 145 (Smart Access System (For Start) - Symptom Tests (2 Of 2)) >> SMART ACCESS SYSTEM WITH PUSH-BUTTON START (for Start Function, HEV Model) >> Unable to Unlock Steering Wheel (Hybrid Control System cannot Start) [11/2021 - 03/2023] >> Caution / Notice / Hint

Caution / Notice / Hint

WARNING: This page is about a different car, the 2025 Lexus NX 350h, 2024 Lexus NX 350h, 2023 Lexus NX 350h, and 2022 Lexus NX 350h. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • When using the GTS with the ignition switch off, perform lock and unlock operations using the door control switch of the multiplex network master switch assembly at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins, and then select the vehicle model manually.

    Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Smart Access. While using the GTS, periodically perform lock and unlock operations using the door control switch of the multiplex network master switch assembly 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 electrical key transmitter sub-assembly and turn the ignition switch to ACC or ON.
    • To lock the steering, turn the ignition switch off with the shift position in P, and then open a door.
  • The smart access system with push-button start (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart access system with push-button start (for Start Function) after confirming that the communication systems are functioning properly.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 03/2023]

  • After performing repairs, confirm that the problem does not recur.
  • Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart.
  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the steering lock ECU (steering lock actuator with ECU assembly), ID code box (immobilizer code ECU) or certification ECU (smart key ECU assembly), refer to Registration.

    Refer to REGISTRATION [11/2021 - 03/2023]

  • When disconnecting the cable from the negative (-) auxiliary battery terminal, some systems need to be initialized after the cable is reconnected.
  • If the steering lock ECU (steering lock actuator with ECU 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 hybrid control system. This function prevents the hybrid control system 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 power switch.
  • Before inspection, switch ACC customize setting "ON".

    Refer to CUSTOMIZE PARAMETERS [11/2021 - ]

  • After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
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