Could you give me more details on the update CD? Release numbers? Part numbers? Release date? Anything? I called Sewell Cadillac here in Dallas and they want me to bring the car in to check. I may later this afternoon.
I hadn't thought of turning the call volume down since it should be turned off due the bluetooth connection, but I will give it a try.
Ok, I did take my 2009 STS *N in to Sewell Cadillac Friday afternoon. Although, they didn't say anything about a firmware update, they did find some TSB for Bluetooth echo that has them replacing the microphone. I should get it back some time tomorrow and I'll see if it fixes anything.