I think you're tallking about CANBus, as you want to "explore" the Prius data bus. Vass has posted about this: The new 2004 Toyota Prius : My CAN Project I'm a systems analyst with a background in telecomms and industrial automation. CANBus is also used in a growing number of industrial control networks. We use this model Agilent MSO: http://cp.literature.agilent.com/litweb/pdf/5989-5126EN.pdf
