I just finished installing new speakers in my 2013 a3. I replaced the two front and the two back and ran those to a new amp in the rear. I have it connected to a pioneer 4200nex headunit. It was all working flawlessly but when i was finishing up putting the headunit back in mycar battery died from having the lights on too long. I recharged the battery and when I turned on my car I got stabilization program fault warning and my tire pressure light came on and wont reset. to top it all off i lost power to my amp. my pioneer headunit also displayed amp error. I checked the fuses behind the radio and on my wire harness adapter(C2R audi adapter) and they were all fine. I am scared that I really messed something up. Please let me know if you have any idea what has happened?