[Rayluka1]

I have a 2011 CTS with the premium package. It has the 12 speaker Bose system. I want to add the Nav unit to this car. When doing this since its the premium system can I plug and play with a new Nav head unit and screen or is it a special wiring install

 

[HurstGN]

Do a search...lots has been written, including how to swap the different units.