I have a 2009 Cobalt LS the issue I am having is for the most part my front speakers don't work. They come on and off and when I use my blinker there is no sound and when like the seat warning symbol comes on there is no sound to it either. So I have figured it has something to do with the wiring harness but I don't even know where to locate the problem. So any help would be appreciated. Thank you!!!