I recently ordered an aftermarket radio and adapter kit from Crutchfield. They suggest disconnecting the battery before performing any work. Since newer radios seem to be tied more and more into the car's overall electrical system, I'm inclined to do it. My question is this. Are there any codes/settings (none for the radio) that I need to worry about saving off with a scanner before I do so?
The only thing I can think of is the remote keyfobs - will they need reprogrammed? Will the mass air flow sensor need reprogrammed or will it go through a self-learn process over a number of miles/driving conditions?
You don't have to worry about saving anything before you disconnect the battery. After you reconnect it, you will have to reset the clock. Your trip odometer will have reset to zero. The one-touch up and down window control will need to be reset by completely raising and lowering each window one time. There will be some warning lights on your dash that illuminate the first time you start the car after reconnecting the battery, but they will go out once you have driven a few yards. I think one has to do with readaptation of the steering. Your key fobs should not need any reprogramming.