For those with a U.S. Xterra, does the RF head unit have just a Radio button or does it also have a SAT button on it?

Reason I ask, is I'm trying to find out if the ipod interface will work with a Canadian version of the Xterra (2006) with the RF Head unit. So far I have never been able to get a firm "yes this works" answer. They don't sell the interface at the CDN dealerships so I don't want to order it up from the States only to find out it won't work.
thanks