Pioneer AVH-8500BHS install
Installed new Pioneer AVH-X8500BHS.
Pulled dash.
Soldered wiring harness and finished with shrink-wrap.
REMEMBER to UNPLUG factory amp next to Glove Box if you are using the Toyota alternative (Grey) harnesses and not the original connector ( I don't even know how you could use original harness. The amp speaker output is wired in parallel with the grey harnesses, and if you do not unplug it, you will blow out your new head unit.
Installed new USB wiring channel into center console with 1" hole drilled, so I can put iPhone in console when connected.
Put it all back together and it worked. BUT, found out that the included USB extension WILL NOT work with Pioneers AppRadio and iPhone 5 unless you buy another $100 worth of special cables. Not happy about it, but ordered cables anyway so I can use things like Waze on the head unit instead of iPhone. With the new cables, you can run your apps on the 7" touch screen on the head unit instead of iPhone.
Today's project will be to install Kicker Hideaway sub and new cables. I will keep updated on progress. Also bought a bunch of Dynamat to sound deaden.