I called Kenwood regarding the same problem, they told me the vehicle selection has nothing to do with the icon, the vehicle selection is for the KNA_g510 to determine the max speed allowed, i.e. if you choose emergency vehicle, the max speed for the KNA-g510 would be higher than if you choose a car or truck.
System :" Garmin kna-G510/ Kenwood KTV-512
I'm having a problem with the Kenwood SatNav . It seems when I trun on the vehicle the nav comes on and work fine for a few minutes, then the screen goes to a blue screen with the words No nav. I have to restart the vehicle to get the nav on screen again then it does it all over again.