Component Outline Power switch Transponder key amplifier Transmits the power switch signal to the power management control ECU. Informs the driver of the power source mode or system abnormality with the illumination stage of the indicator light. Receives the ID code and transmits it to the certification ECU (smart key ECU assembly) when the key battery is low. Certification ECU (smart key ECU assembly) Performs key verification. Controls the electrical key antenna (indoor). Transmits the gearshift control lock/unlock command signals to the transmission control ECU assembly. Outputs immobiliser set/unset commands. Forms the push-button start system detection area. ID code box (immobiliser code ECU) Receives gearshift control unlock or engine immobiliser unset signals from the certification ECU (smart key ECU assembly), certifies them, and transmits each unset signal to transmission control ECU assembly or power management control ECU. Power management control ECU 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. The power management control ECU and certification ECU (smart key ECU assembly) permit starting of the hybrid control system after receiving an unlock signal from the transmission control ECU. Controls the power switch indicator. Transmission control ECU assembly Locks/unlocks gearshift control based on lock/unlock request signals from the certification ECU (smart key ECU assembly). Detects gearshift control lock/unlock status and transmits it to other ECUs. Activates the shift control actuator based on signals from the power management control ECU when gearshift control is unlocked. Controls the application timing of current to the parking lock motor based on signals from the rotation angle sensor. Combination meter assembly Operates various warnings (messages on the multi-information display, sounding of the buzzer in the combination meter, blinking or illumination of the master warning light) according to the command signals from the certification ECU (smart key ECU assembly). Displays information when the push-button start system has a malfunction. Outputs a vehicle speed signal to the each part that uses the speed signal. IG, ACC relay Turns on/off according to power management control ECU control 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 power management control ECU. No. 1 indoor electrical key antenna assembly (front floor) No. 2 indoor electrical key antenna assembly (rear floor) Sends the request code from the certification ECU (smart key ECU assembly) and forms the vehicle interior detection area. No. 3 indoor electrical key antenna assembly (inside luggage) Sends the request code from the certification ECU (smart key ECU assembly) and forms the luggage compartment interior detection area. Door control receiver Receives the push-button start code/wireless code sent from the key and sends it to the certification ECU (smart key ECU assembly). Wireless door lock buzzer Sounds when warning functions operate in accordance with certification ECU (smart key ECU assembly) control. Electrical key Sends the ID code upon receiving a request signal.