Because the question was asked, I'll explain a bit more.
If you have a 3 spoke steering wheel with cruise, these buttons *may* allow you to have partial or full steering wheel radio controls.
- They should physically fit into the steering wheel.
- The Volume button should work out of the box.
- The other button should work, and provide a function, but it might not be the intended function of the button. (this is what mine do)
- There is an article on this or another G6 site that takes about adding these in using the Tech 2 at a dealer to make it work correctly. (I asked a dealer to try it, but I don't think they understood, so it never happened. going to try again soon.)
Background: The steering wheel controls work by sending a specific resistance value on the line for each button, which gets interpreted as the function by the receiver (radio in this case.) Unfortunately, GM only kept the resistance values of the Volume buttons the same when they switched from the 4 spoke to 3 spoke steering wheel. I believe this was in 2006. However, some components, such as the radio, did not get updated if they did not have to for things like the radio controls if it was not chosen as an option. In my case, I have an 07, but it seems the radio believes the values are those of a 4 spoke wheel. So this is why your mileage may vary.