Glass delaminates at the edges before it breaks, which is why a mirror that will not clear is usually a glass rather than a motor problem.
Mirror glass delaminates at the edges before it breaks, which is why a mirror that will not clear in the morning is usually a glass rather than a motor fault. Heated and aspheric (wide-angle) variants are different part numbers from plain glass, and on some models the glass is supplied with the backing plate already attached.
