So pollen season is over and the interior of the truck needed a good cleaning. No key in ignition, no key anywhere near truck. As I wipe the Nav screen with a soft rag and pass by the volume and tuning dials which turn a bit the radio turns on with the nav screen lit up with maps loaded. Open and close the doors and the radio stays on. Go in the house, get the key, start the truck and the radio is still on. Shut the truck off, open the door, the radio goes off as expected. Asked the rep at the dealership service department about it and he gave me a bewildered stare. Is there some mystical combination of dial turning, button pushing that tests the radio function???