There is a company called PAC that specializes in modules like you describe - keeping the steering wheel controls functional with an aftermarket radio.
Click HERE to visit their site. You have to choose a compatible manufacturer. Basically - it is turning the steering wheel controls into a "remote" hidden in the dash.
CLICK HERE for the PAC installation guide for the 2006 CTS
For best results and compatibility,
look for a shop in your area that carries PAC - it is a common manufacturer in the BIZ, and have them install it.
The simple answer to your question is YES as long as you use the module compatible for the brand of radio you are installing.
Thanks for using FixYa - a FixYa rating is appreciated for taking the time to answer your FREE question.
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