System Diagram

WARNING: This page is about a different car, the 2009 Lexus IS 350 and 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Smart Access System With Push-Button Start - System Diagram (1 Of 4)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Identifying Smart Access System With Push-Button Start - System Diagram (2 Of 4)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 3: Identifying Smart Access System With Push-Button Start - System Diagram (3 Of 4)

Fig 4: Identifying Smart Access System With Push-Button Start - System Diagram (4 Of 4)

Transmitting ECU (Transmitter)	Receiving ECU	Signals	Communication method
Combination meter	Certification ECU	Vehicle speed signal	BEAN
Power source control ECU	Certification ECU	Alarm control signal Power source control ECU information	BEAN
Certification ECU	Combination meter	Shift position warning signal (A/T) "Single beep" sound control signal "Intermittent beep" sound control signal "Beep buzzer" sound control signal	BEAN
Main body ECU RH	Certification ECU	Door lock/unlock position signal Courtesy light switch signal Alarm signal Destination signal Vehicle type handle signal Door electrical 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
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 The number of registered key 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 L code registration status signal	LIN
Steering lock ECU	Certification ECU ID code box	Steering lock request signal Steering unlock signal Steering lock confirmation Steering unlock confirmation Diagnosis response signal Steering unlock drive relay signal Steering lock drive relay signal Steering lock motor operation signal	LIN
Power source control ECU	Certification ECU	Shift position P signal (A/T) 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