2012 LE, basic radio.
Set the language from Spanish to English
(it says Corolla, but it works for Sienna as well, as they have very similar audio equipments).
My tip: so I followed the instruction 1 and set up bluetooth audio for my iPhone 5s with the minivan, and later on I tried to add the bluetooth phone, and I was not successful during the step where the phone tries to connect to the bluetooth audio (car multi-media). The fix is to forget the car multi-media in the iPhone, and set up again for both phone and audio (“device type” in the car audio prompt).
(update 03-12-15) I had to pair my iPhone 5s bluetooth again with sienna, after iOS 8.1.3 update. Forgot this “forgot the car multi-media” tip initially 🙂 Note again select “phone setup” and “interior bluetooth audio”, this way it will work both for phone and audio.