So i crashed my car over the winter into a tree and had to take my car into the dealer to get it fixed. It is a 04 mazda 3. I had installed an avic d3 6 months prior to the accident and i loved it and it played perfect. When i took the caar in i left the unit installed and took out my sub with the sub and speaker amp on the back of the box. When i put it all back in though nothing worked right. I had a terrible high pitched whine threw the speakers and when i would plug in the sub it exploded with sound. IHowever the speaker out puts work fine so i just listened to my rear speakers for a while