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System Diagram

WARNING: This page is about a different car, the 2008 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Cruise Control System Diagram
G05407257Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Communication table: 

COMMUNICATION REFERENCE

Transmitting ECU (transmitter) Receiving ECU Signals Communication Method
ECM Combination meter ECU
  • CRUISE indicator operation signal
  • CAN
  • BEAN (Instrument Panel Bus)
ECM TCM
  • Shift up/down request signal
CAN
TCM ECM
  • Shift up/down response
CAN