It will start the 10 secs countdown once you activate the door so your job is to clear the path so the door can close
i think you are supposed to use one of jacobs powers- pull or whatever its called just press left shift and choose it (i think theres only one power on him at that time)
the Tip in the first responce is good
You run up to the door press the button. but DO NOT GO IN THE ROOM or the door wont close. its got a 10s count down and enimies wil ltry and run threw it
I'm way past that now lol. Just finish rescuing Tali.