When I was on the dealer doing the Prius C maintenence, while waiting I look for the 2013 Tacoma model. For my surprise the one with the standard radio has the Voice Command button, while the one with the Touch Screen radio NOT have such button. With the above mention, My Prius C have the Standard Radio and the spot for the Voice command. Two question came: 1. Are the wiring from the steering wheel to the radio is build in so I can purchase only the VC button? 2. Can the VC work on Standard Radios too?