I purchased used 2014 Pilot Touring recently. There is a rocker switch on the dash above the Parking brake release with a large P and what look like sound wave symbols (graduated small to large) to the right of the P. I can't find it anywhere in the manual, so I guessed it might be a sound signal activation switch when backing up. I tried that and I didn't hear anything. It has a green light and makes a beep when switched on. So I'm scratching my head. Anyone have any ideas? Thanks!