Folks I have a 2016 PILOT EXL with sensing and we recently replace a cracked radio head unit with a replacement one we found off Ebay. Everything fired up okay however we have very little sound coming from the speakers. No matter how high we adjust the volume it will not go any louder. I spoke with the fellow we bought it from who is the original owner and he stated that everything worked perfectly when he pulled it. He just upgraded. Suggestions?