Cruising on AM radio waves

My Chevy Tahoe is making a creaking noise my mechanic friend can’t yet diagnose, so I am using the next best thing: mommy’s minivan. 

It’s a little more modern than my car, so I admit I am not adjusted to the fancy buttons many vehicles have these days.

So, when I somehow switched on the AM radio after accidentally pressing a button on the steering wheel, I avoided trying to figure out how to shut it off.