I mean at the very least it is used to control car keys. I know that because MANY cars are being stolen locally via the keys being reset using the OBD-II port.
They target particular models of a car. They drive around, find that car/model, then use a slim jim to open the door, plug into the OBD-II port, and reset the key to one in their possession - then they can just drive the car away as if it was their own.
(Apparently it is particularly straightforward on recentish BMWs, because the alarm has a dead area that allows a thief to gain access to the OBD port undetected.)
I mean at the very least it is used to control car keys. I know that because MANY cars are being stolen locally via the keys being reset using the OBD-II port.
They target particular models of a car. They drive around, find that car/model, then use a slim jim to open the door, plug into the OBD-II port, and reset the key to one in their possession - then they can just drive the car away as if it was their own.