Pioneer has confirmed that there is a compatibility issue with the AppRadio mode in some of its in-dash receivers with iPhones and iPod Touch running iOS 11. Due to the compatibility issue, the AppRadio mode will simply show a blank screen at launch.
The company is looking into a fix for the matter and until it arrives, it recommends users stick to iOS 10 on their iPhone or iPod Touch. A list of all the Pioneer models having compatibility issues with iOS 11 can be found here. The company will post a notice on its website along with a link to download an updated firmware which will resolve the issue.
AppRadio mode on Pioneer receivers allow users access to a bunch of compatible smartphone apps on the infotainment system of their car.
If your car has a Pioneer receiver or any other infotainment system that is having connectivity issues post updating to iOS 11, you can try some of the steps mentioned in this article to try and solve the problem.