My 2014 Smart ED makes a funny taping noise when I first start driving. It doesn't do it the rest of the time during that drive. If I turn off the ignition and start out again it makes the taping noise again. Is this the pedestrian warning? If so why does it only do it when you start a new drive and doesn't do it when you take off from a stop? The noise is a repeating taping noise for a 4 or 6 count. Again it only does this when you first turn the ignition on and start moving at above 10 mph.