Does anyone know if disconnecting the battery reset the bose radio? Does the antitheft feature go into effect? I just wanted to reset the ecu on my 04 deville, so it would only be disconnected for a minute or two.. If it does how do I know the code for my radio?

You shoudn't have any problem disconnecting the battery, but, as you know, you'll loose your radio presets. Simply punch them in again. This is as it's been for the past 10-15 years, but I don't know what weird programable bullshit GM designed into the '04s