Similar issue. Updated from a iPhone 8+ to an iPhone 11 and 13.3.1. I have an older Pioneer head unit DEH-X6600BT that had worked just fine with my 8+ with a wired USB connection. After I updated, it's hit or miss if the usb works or not. I get a CHECK USB error on the reciever. Bluetooth is working so I can make and receive phone calls and Siri also works. None of the music apps or Pandora will connect anymore. Sometimes if I turn the car off and on and reconnect the phone it sometimes works.. Mostly not.
Ackman
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