I have installed the F700BT in my 2007 Yaris S Sedan without a glitch. I ordered the wiring harness from Crutchfield, and all wires match. I just hooked things up wire color to wire color, and everthing worked like a charm. I don't believe there was a speed wire, though. I hooked this up just two weeks ago and already I forget. If my memory serves me correctly, the only wires I didn't use was the remote control / steering wheel control wire. Hmmm maybe there was an orange one, though. Grrrr.
Also, check out the first review on this page: http://www.crutchfield.com/App/Product/ ...