mts3 said:
It doesn't have to be switched on. On mine, I just leave the switch in the on position and it shuts off when the door is closed. Or at least I hope it does! (car battery hasn't died even after sitting a week).
It shuts off when you close the hatch, I got inside the trunk and had my friend close it to see if it did the day I brought the car home....let me tell you, it's quite roomy .