I had something similar on my '90 T-Bird. It actually was an after market moon roof from ASC. It had four buttons, open, vent, close and an override. It had one-touch open, one-touch close and when you turned the car off it fully closed. This feature could be turned off the with override button. Just hit that and it stays put where it is when you turn off the car.
Mike
'95 SE, ATX, KKM