System Diagram

WARNING: This page is about a different car, the 2006 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Entry And Start System Diagram

TRANSMITTING ECU SIGNALS REFERENCE

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