I have a 2008 gmc acadia. Just all of the sudden the radio started getting staticky sounding, and then would pop, and buzz. It gradually got worse, and the radio eventually stopped. The turn signals also dont make any noise, and the door chimes dont work either. I read about it could possibly be water in the wiring harness in the doors. I checked and there was some water in a couple of them. I cleaned and dried those out. It buzzed and popped a bit more, and Ive been keeping it in the garage. Its all dried out. It has completely quit working now. No sound at all from anything, and the buzzing and popping has stopped. I checked the fuses for the amp, and radio. All was good. So someone mentioned it could be the amp. Does the amp control the sound for everything? Any help would be appreciated.