I have a Koleos 2018 and everytime I plug my iphone to the usb start connecting and disconnecting and do not start Carplay. With Android Auto work’s perfectly.
Well, to fix the carplay won’t connect on your iPhone, firstly, please make sure the carplay is not restricted. Then please verify the siri. Next make sure everything is carplay-compatible. Finally, to completely get out of the trouble without data loss, then you are suggested to use any iOS system recovery tools.