04' w/Nav and JBL AUX Input Options

I have searched endlessly to try and figure this out. Everything I read tells me that only certain types of aux adapters will work if you have Nav and the JBL system....Everything on eBay I see has conflicting information some say that it won't work with NAV or specific models, but then that same product from another seller will say that it will work. And then some list an 04' Prius but really it won't work. Does anyone know specifically which aux inputs will work for my Prius, and do I need to get any special cables for my head unit? Thanks a bunch.