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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.
Item Details
Number of BEAN connected ECUs*1 12
Number of CAN connected ECUs*1 7
Gateway function between BEAN and diagnosis Gateway ECU
Gateway function between BEAN and CAN Gateway ECU
ECU in charge of vehicle customization information Gateway ECU
Protocol CAN and BEAN

HINT: 

*1: Optional ECUs are also included.

Fig 1: Identifying Multiplex Communication System Diagram
GTY304927Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002