Hello all! I have a 2015 Sentra SR. About 8/9 months or so ago my radio stopped producing sound and my backup camera stopped working all at the same time. My radio (touchscreen with GPS navigation) appear to be on and working, I can press the buttons and switch stations/change volume but there is no sound. For months I drove around with no sound, my local nissan dealership wanted $350 to diagnose and I figured it wasn't worth it. Randomly a few weeks ago, I got in my car and the radio was magically working again! It's worked great for a few weeks, but sadly now it is back to no sound and no backup camera. Any suggestions? I'm thinking wiring but can't find any diagrams online to know which wires to even check. Any help is appreciated! Thank you in advance.