I got an iPhone 11 Pro Max after Christmas that I immediately updated to iOS 13 upon unboxing.
I have a Pioneer Carplay system that I’ve had for about 4 years and that I’ve used successfully with iPhone 6, 7, and 8. I updated the firmware on the Pioneer system about 9 months ago to the latest.
However, when I connected the iPhone 11 to the Pioneer system I got nothing. Even though I could connect other generations of iPhones and run CarPlay no problem.
I googled the issue and tried many of the suggested solutions with no luck. However, there was one thing I read that I hadn’t tried: use an official Apple USB cable to connect the iPhone to the Pioneer. However, as you know, you need an adapter to connect the new Apple connector to traditional USB.
I ordered the adapter and it arrived today. I went out to the car feeling very skeptical. I connected the adapter and the cable to the Pioneer system, then plugged it into the iPhone, fired up the car, and.... I’ll be ****** if CarPlay didn’t come right up.
I tried again with several so-called “certified compliant” cables from third parties and got nada.
So, there you have it. The secret sauce appears to be that you must use an official Apple USB cable for iPhone 11 / iOS 13 connected to CarPlay. That’s not to say that there aren’t other, unrelated problems that people are experiencing, but this appears to be a big piece of the puzzle.