Is your phone mounted close to the air vent? Siri hears me perfectly in my car, even when the phone is in my pocket but it doesn't hear me at all when I mount the phone on the air vent.
Yes, it is. Maybe it doesn't hear me because of that.
For what it's worth, it doesn't work either when it's my pocket. When I come home and ask it to turn the lights on, it doesn't answer if it's not in my hand.
That might be a separate issue - you have to specifically enable a setting which will make the phone listen for Hey Siri when it's face down (or in the pocket).
