I purchased a replacement radio and when I pulled my old radio out I noticed that on my radio there were two wiring plugs, one white and one gray. On the new radio there are three plugs, one white, one gray and one blue. the white and gray plugs on the new radio are the same as the old radio. When I hooked up the new radio there was power and display but no sound. The plugs on the new and old radio are in different places. I'm thinking I'm missing something here. I don't think there is any way I can determine if this was out of an LS or GS or other model. On the face, the new radio is identical to the old radio.
Any thoughts would be much appreciated.