when the alarm was being installed i noticed black plastic tube no wires, asked installer what it was, he advised thats for climate control and plugged it back in...he advised he didnt unplug it. is that all it is or is there actual wire connector???? thanks in advance if anyone can confirm this! also got a flashlight and shined it into little grill.... there nothing there besides a small metal wire and round plastic surround... maybe there is no sensor in there already!