this is worth checking out!iv'e been dealing with the complex task of getting a integrated phone in our 2003 S-500.the cost and component install is pretty stout even if you get all used equip.EuroCarPhone.com is selling me their kit that they claim will work with my nav head unit and steering wheel.it looks like a simple install and the cost is approx $1100 complete with a docking station for the phone.