update for Uconnect

Yes, Chrysler would say that. Their uConnect system has been famous for not working well. A search here on the forum will show a large number of complaints about their system. See if any of the information here in this support document will help. Get help connecting your iPhone, iPad, or iPod touch with your car stereo - Apple Support

You might want to take a look at this other discussion about uConnect. Unable to connect to uconnect or Bluetooth iOS 8

You would need to contact Chrysler for updates to uConnect. They are responsible for that software. Check with them to ensure it is compatible with the iPhone 7 Plus.