I'm not taking about blue tooth, I have a USA*SPec: PA15-Toy (Toyota/lexus)
USA SPEC: iPod to Vehicle Interfaces I think it is due to Apple-imposed software limitations, everything else works, My GPS on the iphone comes out thru the factory radio system, when a call comes in the ringtone come thru the factory radio system, The songs comes out thru there to, the only thing that does not come thru my speakers are the conversations.
I think it somebody can break that limitation, we will be happy campers.