If you don't have steering wheel controls already on your steering wheel, then yes. That's all you'd need. I needed that SWI-PS, because my stock system had steering wheel controls, and I didn't want to lose their functionality. It would have been stupid to have nice controls on the steering wheel and not be able to use them. Now, if you have On-Star or something, you may need a slightly different model, but somewhere between PAC and Scosche you should be able to get it done. Also, if you call Scosche and tell them what you have, they can tell you exactly what you'll need.