Hi,
Yes, the Red Clip will activate the IR Motion Sensor with the Top Down. This is what I use, put side windows Up and Top down - better than some guy slashing the Top to take something from inside. Find it here:
http://store.yahoo.com/eagleday/inpr1.html
Hope this helps...
Happy Motoring!...Jim'99
PS No Factory xtra, it's standard and behind the Dark Red Oval Trim pieces on either side of the Interior Light on the Windshield Header. Hope this helps...