No Siri audio over Bluetooth.
On my 2014 Toyota Camry with my iPhone 11.
Siri’s voice will work for map directions. I also have Bluetooth audio for playing music or on a phone call.
However any interaction via “hey Siri” will fail to provide any audio. I can see she is summoned on screen. However she doesn’t listen or speak.
What I have noticed is if I tap the Bluetooth icon in the bottom right when Siri is on screen, I will see two entries for my car audio. When I select the other duplicate entry she will work for that single Siri session (i can then press the Siri icon and continue the conversation). If I dismiss her and then use Hey Siri again, she will be silent.
This occurs on iOS 13.0 to 13.1.3. It doesn’t affect my iPhone 8 Plus on iOS 12.
I have factory reset my iPhone 11 and deleted the Bluetooth pair and re-paired. Same issue.
This appears to be a bug with iOS 13 or the iPhone 11.
Other users have posted here with the same issue but not just for car audio but for external Bluetooth speakers.
iPhone 11