I also have an Alpine ILX-705D and same issue - car play does not work wirelessly or when connect with USB Cable. Half the time the device doesn't even connect for simple settings. Perhaps it is a fault with the Alpine Firmware rather than Apple. I had a 702 previously and no issues connecting.
Billythefish
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution