iroccopz28

I have an 07 Cobalt. The front speakers work intermittently. When they work the chimes and everything work however when they aren't working the chimes aren't working. I thought it was an issue with the stereo so I replaced the stereo using the wiring interface, and now I only have rear speakers and haven't heard the front speakers or the chimes work at all. Has anyone had this happen or heard of it happening and have any idea where I should start to look? Ive done many stereos on my lifetime, however I have never done one that required the interface in order to hear the chimes.

Thank you for any help, I am lost at the moment and am looking forward to hearing some good new and direction.
Jim