926
Jeep Introduces Pop-Up Ads That Appear Every Time You Stop
(tech.slashdot.org)
This is a most excellent place for technology news and articles.
Could be like some of those TVs that have baked-in ads. So if you don't have a data connection, they'll just play the default ones.
Edit: I imagine that the car to prevent you from unplugging the antenna would probably do the classic, "I haven't had a data connection in X amount of time, therefore I cannot verify the security of the device, so we're going to prevent the use of autoplay."
Or there's an LTE chip soldered in there somewhere...