While not perfect, the USA SPEC TOY15 was the best way I could find to play my iPhone music through the Nav system 3-4 years ago. Back then they said it would work in the LX470 2002, but after I had dealt with them for a couple of months they decided that the unit wasn't 100% compatible for this year. They even sent me the next model up which I think is the TOY 20. Didn't work so I returned it.
I'm attaching a few pictures that shows what I'm looking at when using the different devices. The TOY15 is set-up under "DISC" so when pressing "DISC" once, the screen with 9 "buttons" comes up. If you press "DISC" again it goes into the 6 disc changer under the armrest. The first picture shows #7 lit up which lets you control the playlists, etc directly from the iPad/iPhone. You can still use the Volume control and other sound settings from the head unit. When #8 is lit the TOY15 unit is almost useless. You can play your first 6 playlists but you don't see any playlist names, artists or songs. Just numbers. You can skip to the next song in your playlist, but that's about it.
Side note; I was able to set the micro switches so that I could see the name of the artist and songs, but when toggling between the radio and the iPod it(TOY15) shut itself down and I had to disconnect the iPod before I could start again. That's why I changed the switches to the current set-up even though I lost the names of the songs, etc.
The next photo is of the screen with #9 lit. This is the satellite radio.
The DISC RPT and the rest of the buttons don't work. The only one that works is the "up" and "down" buttons to the right in the picture when in #8 mode. It jumps 10 tracks ahead or backwards every time you push it.
I placed the iPod/iPhone cable through the ashtray where it's stored and out of the way when not in use.
All in all I'm happy I installed this thing. Much better than the cassette adapter and no comparison with the FM modulator. Yes, it has its downfalls, but until they make a unit especially for our rigs, I'm sticking with this.