The Sienna forum has been a wealth of information!
A steering wheel switch is 84250-08030-B0 (B0 for the gray <taupe> switch), which I've just ordered. (includes both sides)
Parts for the Aux port are 84480-AE0303 and 86190-AE010. I've ordered them also.
My final bit of news is that I used the original electrical diagram and ran a wire between pin 12 and 15, but an update diagram showed the jump er between 12 and 18. I need to try this when I pull the radio. This may help my microphone issues.
More to come.....
Paul
