After the monstable shifter debacle, the nhtsa insisted FCA make a software update to tell if the driver got out of the car when it was not shifted into park and then automatically shift it into park. This was when the WK2 didn't have an electric parking brake, that could be set by the computer.
One of the parameters the software looked for to tell if the driver got out of the car was if the seatbelt was unbuckled for the driver. There is a whole list of parameters, but they all come down to the car is running. Then the door opens and the drivers seatbelt is unbuckled and the software will shift into park, or set the parking brake on the M/Y with the brake the computer can activate.
Gotta' love it, when the car is in control of YOU, rather than YOU being able to control the CAR.....