Took my CC to the dealer 3 weeks for a tranmission issue and after a diagnose they said they had to keep it. While they had it i told them to go ahead and install the ipod add on so i can control my ipod through the touch screen. They had my car for about 3 weeks and the day i was to pick it up the service manager called and said that they could not install the adapter because it was not compatible with the radio i have. He said it was an RNS 510 and that there was no way to attach it. I'm a little confused when i bought the car it was a saturday and they did not have anyone available to install and that is the only reason i left with out it and now they are telling me it could not be done. Is this correct?