Shortly after buying my 2011 Mazda 3, my radio suddenly stopped producing sound. Aside from having no sound, the radio still worked fine as the in-car Bluetooth and all the buttons still operated as normal. After doing a little research online, I found out that the amplifier for the Bose sound system died. I also found out that and that Bose replaces the defective amplifiers for free! This article exists to help you diagnose the problem and deal with Bose yourself, so you do not have to go to a repair shop and have them fix it.