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System Diagram

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Cruise Control System Diagram
G04114781Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Communication Table: 

COMMUNICATION TABLE

Sender Receiver Signal Line
Hybrid Vehicle Control ECU Combination Meter ECU CRUISE indicator operation signal CAN BEAN (Instrument Panel Bus)