sometimes I find I get nothing when I connect carplay.
depending on the app I sometimes have to have it running on the phone before I connect, sometimes I have to restart my phone, sometimes if I have BT connected I will get no sound and sometimes I have to insure the phones volume is right up before I hear anything from the unit.
so it is kind of hit or miss, I haven't found one specific way that insures when I plug my phone in that I will have full functionality.