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

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Start Function) / System Diagram

SYSTEM DIAGRAM

Component

Outline

Engine switch

  • Transponder key amplifier
  • Turns on the power and starts the engine.
  • Contains a built-in transponder key amplifier to start the engine when the electrical key transmitter sub-assembly does not operate properly due to a depleted transmitter battery or wave interference.

Certification ECU (smart key ECU assembly)
  • Changes the power source mode by operating the ACC and IG relays.
  • Controls starting of the engine by operating the starter relay.
  • Performs key verification.
  • Controls each electrical key antenna (outside), electrical key antenna (indoor) and door lock/unlock sensor.
  • Outputs entry door lock/unlock commands.
  • Outputs steering lock ECU (steering lock actuator or upper bracket assembly) lock/unlock command signals.
  • Outputs immobiliser set/unset commands.
  • Forms the smart access system with push-button start detection area.

ID code box (immobiliser code ECU)
  • Receives command signals from the certification ECU (smart key ECU assembly) and outputs immobiliser set and unset command signals to ECM.
  • Records codes for smart verification.

ECM

Outputs a signal indicating that the engine has started to the certification ECU (smart key ECU assembly) when starting the engine.

Steering lock ECU (steering lock actuator or upper bracket assembly)
  • Receives command signals from the certification ECU (smart key ECU assembly) and activates the steering lock ECU (steering lock actuator or upper bracket assembly).
  • Records codes for smart verification.

Combination meter assembly
  • Displays various warnings (messages on the multi-information display) according to the command signals from the certification ECU (smart key ECU assembly).
  • Outputs a vehicle speed signal to the ECUs.

IG, ACC relay

Turns on/off according to the certification ECU (smart key ECU assembly) and provides power to each system.

Stop light switch assembly

Detects when the brake pedal is depressed (switch is on) and outputs a signal to the certification ECU (smart key ECU assembly).
  • No. 1 indoor electrical key antenna assembly (front floor)
  • No. 2 indoor electrical key antenna assembly (rear floor)
  • No. 3 indoor electrical key antenna assembly (inside luggage compartment)

Sends the request code from the certification ECU (smart key ECU assembly) and forms the vehicle interior detection area.

Electrical key transmitter sub-assembly

Sends an ID code upon receiving a request signal.
    Parts Location
    PARTS LOCATION ILLUSTRATION *1 PARK / NEUTRAL POSITION SWITCH *2 SEMICONDUCTOR PWR INTEGRATION ECU *3 ST RELAY *4 STARTER ASSEMBLY *5 ECM *6 IG2 RELAY *7 IG2 FUSE ...

    How To Proceed With Troubleshooting
    CAUTION / NOTICE / HINT HINT: Use these procedures to troubleshoot the smart access system with push-button start (for Start Function). *: Use the Techstream. PROCEDURE 1. VEHICLE BROUGH ...

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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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