I am looking to add cell phone bluetooth integration to my 04 GX470 too. The popular kit is from Parrot, model CK3100. Here is a link: http://www.parrot.biz/products/index.php?id=ck3100
I was searching for the mute wire, Lexus sent me the 2004 Nav radio schematic in PDF. I'll attach it. I have not decided which mute wire to use. Maybe someone has a suggestion? I check out the Lexus Link mute.
-Brian
Well, my attachement does not seem to be getting added. email me if you want the wiring diagram of the nav radio.