Installed the radio Saturday morning. Once I found the attached instructions for getting the dash opened up I was all set. The radio went in easily, the only issue was dealing with the background noise. The RCA connection to the factory amp was providing a solid enough ground for the radio to actually stay powered on when the primary ground was disconnected :o . The RCA ground loop isolators had their input/output connections inverted to the way the Pioneer was set up, but they seem to work just fine when installed opposite to their I/O markings. Once those were in, background noise was gone and the unit works great. Mounted the antenna to the front drivers side of the dash just under the glass, the mic to the steering column, and the iPod/USB connectors ran through the trans tunnel into the base of the center console.
The Avic-F90BT seems to be a good fit for the ES300. Great audio quality, GPS works fine, love the integration with the cell phone, and the ability to play MP3's from a DVD, SD card, USB, or iPod was huge for me. There is room for improvement on the interface, but I suspect that could be said about any of the units on the market. Now that the price has started dropping (I was out the door for less than $515 shipped) it's a good value for what it gives you.
Car_Tech_Docs.zip