A few months back, I remember reading an article where aftermarket radio manufacturers were complaining because car makers were making the radios more and more specialized and they couldn't be replaced because it would affect the operation of the car.
One car I thought they refered to was Volvo's. They said that the radio unit contains not only the radio but controls for other parts of the car as well. I think they meant that alot of the steering wheel controls go back through the radio and would become useless.
Is it possible to replace the radio in a 1999 Volvo S80 (or any other modern car) and retain all the functionality of the radio as well as other car functions?
Or do radios do more that than just tune stations?