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Home >> Toyota >> 2019 >> Highlander LE Plus, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 161 (Smart Key System (Start Function) - Diagnostics - Introduction - (Hybrid)) >> SMART KEY SYSTEM (for Start Function) >> System Diagram [11/2016 - ] >> System Diagram [11/2016 - ]
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System Diagram [11/2016 - ]

WARNING: This page is about a different variant/trim than selected.
Fig 1: Smart Key System Wiring Diagram (For Start Function) (1 Of 2) (11/2016 -)
GTY731758Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Fig 2: Smart Key System Wiring Diagram (For Start Function) (2 Of 2) (11/2016 -)
GTY711430Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 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 (outside), electrical key antenna (indoor) and door lock/unlock sensor.
  • Outputs entry door lock/unlock commands.
  • Outputs steering lock ECU (steering lock actuator assembly) lock/unlock command signals.
  • Outputs immobiliser set/unset commands.
  • Forms the smart key system detection area.
  • 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 compartment)
 Sends the request code from the certification ECU (smart key ECU assembly) and forms the vehicle interior detection area.
Electrical key and tire pressure monitoring system receiver assembly Receives the smart key system 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.
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