1999 Cadillac DeVille Owner's Manual - Page 117

yellowblue Sunroof (Option) Press the switch rearward and release to express-open theglass panel and sunshade. The sunshade can also be opened by hand. If you want to stop the roof in a partially-opened position, press the switch in either direction. Press and release the switch again to open it fully. Press and hold the switch forward to close the glass panel. The sunshade can only be closed by hand. To vent, press the switch forward when the glass panel is closed. Open the sunshade by hand. To close the vent, press the switch rearward. The control switch only works when the ignition is on or when the Retained Accessory Power (RAP) is active. 2-57