Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: System Description

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Suspension / Steering Column / Steering Lock System / System Description

SYSTEM DESCRIPTION

UNLOCK OPERATION CONDITIONS FOR STEERING LOCK

(a) When the following condition is met, the unlock operation is performed.

  • The engine switch is on (ACC) or on (IG).

    HINT:

    When the engine switch is turned on (ACC) or on (IG) and the key and certification ECU (smart key ECU assembly) are verified, the steering is unlocked.

(b) When any of the following conditions are met, key verification is performed.

  • The engine switch is pressed.
  • The brake pedal is depressed so that the engine can be started.
  • 30 seconds have elapsed after opening and closing a door.

HINT:

  • Key verification occurs when the code emitted from the key and the code stored by the certification ECU (smart key ECU assembly) are compared to check that they match.
  • Certification ECU (smart key ECU assembly) verification occurs when the S code and L code are verified while the engine is being started or the engine switch is being pushed. The ID code box (immobiliser code ECU) uses the S code to determine whether the certification ECU (smart key ECU assembly) is authorized. The steering lock ECU (steering lock actuator or upper bracket assembly) uses the L code to determine whether the ID code box (immobiliser code ECU) is authorized.

LOCK OPERATION CONDITIONS FOR STEERING LOCK

(a) When all of the following conditions are met and the certification ECU (smart key ECU assembly) has been verified, the lock operation is performed.

  • The engine switch is off.
  • The shift lever is in P.
  • A door is opened or a door lock operation (door lock, wireless door lock or key-linked lock operation*) is performed.

    HINT:

    *: This is the lock/unlock operation with the mechanical key.

WARNING FUNCTION

(a) A check smart access system message is displayed on the multi-information display in the combination meter assembly when one of the following occurs: 1) A vehicle speed signal malfunction is detected, 2) a malfunction that interferes with steering lock ECU (steering lock actuator or upper bracket assembly) operation is detected.

If a malfunction occurs which results in the message being displayed, the engine cannot be started once it is turned off.

HINT:

DTCs are stored in all cases listed above.

STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPPER BRACKET ASSEMBLY) DESCRIPTION

(a) The steering lock ECU and steering lock motor are built into the steering lock actuator or upper bracket assembly of the steering column assembly.

(b) The steering lock ECU (steering lock actuator or upper bracket assembly) is not connected to the CAN communication system. However, the steering lock ECU (steering lock actuator or upper bracket assembly) is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

    Steering Lock does not Lock
    DESCRIPTION The steering lock actuator or upper bracket assembly activates the steering lock motor and moves the lock bar into the steering column to lock the steering. When the steering lock is opera ...

    System Diagram
    SYSTEM DIAGRAM Circuit Description Component Outline Steering Lock ECU (Steering Lock Actuator or Upper Bracket Assembly) The steering is locked and unlocked by communicating with the c ...

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    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Owners Manual

    Lexus RX (RX 350L, RX450h) 2016-{YEAR} Repair Manual

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