[Flytmech]

The Amp is under the console as described and you can pop the tray out with your thumbs by applying pressure to both sides and pushing out while pulling up. The console comes out in less than 5 minutes to gain full access to the AMP.

Why not get the Solara Navigation head unit from OEMValue.com? I just installed one in my 2006 4x4 Limited and the damn thing rocks. I can help you with all the problems I ran into during the install. You can get steering wheel controls from the sienna to factory fit your wheel. You can add the Aux port, Bluetooth and Voice Mic, Reverse camera, Ipod adapter, the head unit plays MP3's in the 4 disc changer, you can even add XM or Sirius if you want. And believe it or not its all pretty much PLUG and PLAY.
Let me know if you decide to go with the Solara unit, I think you will be way more pleased.
I do think I have the wiring schematic you are looking for as well I have to wait till i get home to check.

Good Luck and Choose Wisely,

Flyt