I just recently purchased a brand new 2010 Mazda 3 i touring sedan. I love almost everything about the car, but I do have a few questions about it. First of all, on the front grille of the car there is a round piece positioned near the bottom right corner. Does this piece serve any purpose, or is it just there? Also, when using the bluetooth audio system (I have an iPhone 3GS), I am able to change the volume of the music with no problem, but I am not able to change the song with the steering wheel controls. I have to do it manually through the phone. Any help would be appreciated.