Please take this with a grain of salt, because I haven't experimented with it a whole lot, but I believe you can always open/close it with the fob when it is in park and you are outside the vehicle, can open/close it with the buttons on the frunk when the fob is nearby and the vehicle is in park and unlocked, and can open/close it from the button inside the vehicle when in park and the fob is in the cabin. I believe if you open it from inside the truck, you have to close it from inside the tuck, if you open from the outside buttons, you have to close it from the outside buttons, etc. The only possible exception to the foregoing is that I think the fob will aways close it when in park. Again, I haven't played with it a lot, but this has been my experience so far.... I imagine it has all kinds of if/then rules so someone couldn't walk up to your parked vehicle while you were in it and open (or close) your frunk, someone in a crosswalk couldn’t open it while you're sitting at a red light, you couldn't accidentally activate it when in motion, etc....