Lexus NX manuals

Lexus NX: System Diagram

Lexus NX Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Access System With Push-button Start (for Start Function) / System Diagram

SYSTEM DIAGRAM

Component

Outline

Power switch

  • Transponder key amplifier
  • Turns on the power and starts the hybrid control system.
  • Contains a built-in transponder key amplifier to start the hybrid control system 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 in 4 stages (off, on (ACC), on (IG), on (READY)) in accordance with the shift state and stop light switch.
  • Controls the smart access system with push-button start function in accordance with signals received from switches and ECUs.
  • Permits the steering lock ECU (steering lock actuator assembly) to supply power to activate the motor. The certification ECU (smart key ECU assembly) permit starting of the hybrid control system after receiving an unlock signal from the steering lock actuator assembly (steering lock ECU).
  • Performs key verification.
  • Controls the electrical key antenna (indoor).
  • Outputs steering lock ECU (steering lock actuator assembly) lock/unlock command signals.
  • Outputs immobiliser set/unset commands.
  • Forms the vehicle interior detection area.

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

Steering lock ECU (steering lock actuator assembly)
  • Receives command signals from the certification ECU (smart key ECU assembly) and activates the steering lock ECU (steering lock actuator 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 that the brake pedal has been 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)

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

Door control receiver

Receives the smart access system with push-button start code/wireless code sent from the electrical key transmitter sub-assembly and sends it to the certification ECU (smart key ECU assembly).

Electrical key transmitter sub-assembly

Sends the ID code upon receiving a request signal.

READ NEXT:

 System Description

SYSTEM DESCRIPTION SYSTEM FUNCTION Function Outline Push-button start function When the electrical key transmitter sub-assembly is brought into the vehicle and verified, this function chang

 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

 Operation Check

OPERATION CHECK OPERATION DESCRIPTION NOTICE: Make sure that the smart access system with push-button start (for Start Function) has not been canceled before performing this inspection. Click here (

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 Operation Check

OPERATION CHECK CHECK POWER SEAT FUNCTION (a) Check the basic functions. *a Slide Function *b Reclining Function *c Rear Lifter Function *d Front Vertical Function *e Lumbar Support Adjustment Function (1) Operate the power seat switches and check that the following

 Ignition Hold Monitor Malfunction (B2271)

DESCRIPTION This DTC is stored when a malfunction in the IG circuit and IG hold circuit in the certification ECU (smart key ECU assembly) is detected. DTC No. Detection Item DTC Detection Condition Trouble Area Note B2271 Ignition Hold Monitor Malfunction When either of the follow

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