iSteven, if it is an 05 then the aux button does nothing, The Aux button would not do anything till 2007 or 2008. The iPod connector that someone has hidden in your center console is most likely the type where you have to tune the radio to a certain station. My 05 had a Sirius Satellite radio that was connected that way. It's now in a box in the garage.
1966 Mustang Sprint 200--Wimbledon White
1998 Mustang V6 Coupe--Silver--RIP, Totalled by brother
2005 Mustang V6 Premium Coupe--Sonic Blue