This only happens in the US, probably. The fun fact is that some car manufacturers believe this is global, so they only allow odd frequencies on the car radio.
We had a radio in our old Chrysler Voyager that required a pretty insane secret code being entered (turning it off and on again 5 times in a row or something like that was part of it) in order to enable to tune to regular EU frequencies...
My 2013 VW Golf has a similarly mad method to move the windscreen wipers to a position that enables the window to be cleaned. I forget the trick - I think its turn the car off, then on, then move the wiper stalk to one of its four or five positions. Or vice versa. I really can't remember.
Edit: switch ignition on, then off. Briefly press the down the windscreen wiper lever.
Oh, that servicing position. That's because you can't lift wipers from their resting position since bommet is too close to windscreen. You have to turn on the ingition, turn it off and then hold wiper stalk in the lowest position for 2 seconds. Same goes for 2013 Skoda Octavia. Had to learn that yesterday :)
I recently watched an episode of Top Gear where Clarkson was driving a Ford Mustang and used the odd-number ending frequencies on the radio as a part of his never-ending "American cars are weird" joke.