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You probably don't remember these but I have a question
(lemmy.world)
This is a most excellent place for technology news and articles.
I think I can clear up your confusion.
By headphone jack there's a transmission of simple analog audio.
By USB however there are endless possibilities.
Ipods (and other apple devices) usually spoke a different protocol than simply providing file access as your car is likely expecting. On a pc you needed to install the application for that, too.
That's likely the reason for not working.
In this case it's easier to just stick in a mass storage usb stick with music files on it.
Yeah, apple always hated the "(any device) is a thing with folders and files inside" paradigm - it was always "I got this app that plays music, I don't know how". So it would be crazy if they would just make any device show the contents of the drive.