Tell a motion sensor to power on? Just wire the motion sensor, and it will pass power to the load when it sees motion.

I'm not getting the goal, and the solution seems to be horribly convoluted.

If a motion sensor sees no motion, it will time out and the load will turn off. If there is no power to a motion sensor, it will not detect motion.

Are you wanting the garage to light up when the door opens, or when there is motion?