1998 Buick Park Avenue Owner's Manual - Page 132

'hclose the glass panel,,press I and hold the switch fwwad. The sunshade must be manually closed. Once the astroroof is closed, it can be opened to a vent position. Push the switch upward to vent. To close, pull the switch downward. The sunshade must be opened and closed manually for vent operation. An assist strap over each door and the frorat rear passenger's door can be used to help you get in or outof your vehicle. It will operate garage doors and gates, or other devices controlled by radio frequency such as ltnome/office lighting systems.