I agree. All of the models use headrest that lock into place by pulling them up. Once you press the headrest button it sends a signal to the solenoid that vacuums out the pods, which pull the locking pins, and the headrests drop.
I'm not aware of an electrical system in the 140s that raises them or knocks them down automatically. I know the 220 and 215 have a system that works like that.