I have a 2012 Toyota 4runner and it's driving me crazy that I can't use Siri in the car over Bluetooth.
All the regular Bluetooth features work fine, music, calls, etc work fine.
Hit the Siri button and I get a 3 second delay, then I say "call so and so"
Siri replies "it looks like its going to rain tonight"
I know it's a car mic issue, if I am at a complete stop, with the ac off then she does a lot better. Other than that it's unusable unfortunately.
I think a Siri "doesn't use Bluetooth" button would solve this issue for me.
Really hope it's in the works.