Interesting. The Dealer told me I could, then told me I could not. They supposedly called honda technical support and were told no on the phone. I have the service manager looking deeper into this for me. I just got the MP3 player installed yesterday and would like to put XM in also because I spend a lot of time in the car each day.
I don't think you can. There is only one auxiliary input on the head unit, so only one auxiliary device can be connected at a time... Besides that, the head unit is not just a preamplifier, but it also controls these devices with a bus cable.