System Diagram

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Smart Key System Diagram (1 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Smart Key System Diagram (2 Of 2)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ENTRY FUNCTION

Transmitting ECU (Transmitter)	Receiving ECU (Receiver)	Signals	Communication method
Combination meter	Certification ECU	Vehicle speed signal Travel distance information	BEAN
Power source control ECU	Certification ECU	Alarm control signal Power source control ECU information	BEAN
Combination meter	Multi-display	Door open warning signal Smart key system warning light signal	BEAN / AVC-LAN
Certification ECU	Combination meter	Smart key system warning light signal Shift position warning signal "Single beep" sound control signal "Intermittent beep" sound control signal "Beep buzzer" sound control signal	BEAN
Body ECU	Certification ECU	Door lock / unlock position signal Courtesy light switch signal Smart key system control signal Alarm signal Destination signal Vehicle type handle signal Door key operation switch signal Door lock output operate signal Wireless door lock / unlock signal DTC erase signal DTC response signal	BEAN
ECM	Certification ECU	Engine speed signal	BEAN / CAN

WIRELESS DOOR CONTROL FUNCTION

Transmitting ECU (Transmitter)	Receiving ECU (Receiver)	Signals	Communication method
Power source control ECU	Certification ECU	Key code recognition signal	BEAN
Certification ECU	Body ECU	Wireless buzzer control signal	BEAN
Body ECU	Certification ECU	Alarm signal	BEAN

START FUNCTION

Transmitting ECU (Transmitter)	Receiving ECU (Receiver)	Signals	Communication method
Combination meter	Power source control ECU	Vehicle speed signal Travel distance information	BEAN
Combination meter	Multi-display	Door open warning signal Shift position warning signal Smart key system warning light signal	BEAN / AVC-LAN
Power source control ECU	Body ECU	Security control signal	BEAN
Body ECU	Power source control ECU	Engine start switch illumination signal Stop light switch signal Courtesy light switch signal DTC erase signal DTC response signal	BEAN
ECM	Power source control ECU	Engine speed signal Shift P position signal	BEAN / CAN

ENGINE IMMOBILIZER FUNCTION

Transmitting ECU (Transmitter)	Receiving ECU (Receiver)	Signals	Communication method
Combination meter	Multi-display	Door open warning signal Smart key system warning light signal	BEAN / AVC-LAN
Certification ECU	Body ECU	Double lock fail-safe unset signal Security indicator light flash signal Security indicator light turn on signal Immobilizer set / unset signal	BEAN
Power source control ECU	Certification ECU	Key code recognition signal	BEAN
ID code box	Certification ECU	DTC (B2791) signal	LIN
ID code box	Steering lock ECU	Steering lock release signal Matching request random number signal	LIN

START KEY SYSTEM

Transmitting ECU (Transmitter)	Receiving ECU (Receiver)	Signals	Communication method
ID code box	Certification ECU	Matching request random number signal EEP ROM access malfunction Model code matching signal Model code mismatching signal ECM code receiving status Engine start permission request signal Engine start permission response signal S code matching result signal S code registration status signal S code registration mode signal L code matching result signal ECM communication signal The number of registered key response signal Diagnosis mode switching signal	LIN
Certification ECU	ID code box	3 bit code request signal ID code matching result signal The number of registered key signal Vehicle type handle signal	LIN
ID code box	Certification ECU Steering lock ECU	L code registration mode signal Diagnosis mode request signal DTC clear request signal	LIN
ID code box	Steering lock ECU	L code registration status signal	LIN
Certification ECU	Certification ECU ID code box	Steering lock request signal	LIN
Steering lock ECU	Certification ECU	Steering unlock signal Steering lock confirmation Steering unlock confirmation signal Diagnosis response signal Steering lock drive relay signal Steering unlock drive relay signal Steering lock motor operation signal	LIN
ID code box	Certification ECU	The number of registered key signal	LIN
Power source control ECU	Certification ECU	Shift position P signal Power ON operation status signal Engine starting status ACC relay operating status IG relay operating status	LIN
Power source control ECU	Steering lock ECU	Steering lock relay power supply status	LIN
Steering lock ECU	Certification ECU Power source control ECU	Steering lock catching malfunction signal Push button start malfunction signal Engine operation signal	LIN