Cadillac 1999 DeVille Owner's Manual page 117

Sunroof (Option)
The control switch only works when the ignition is on or
when the Retained Accessory Power (RAP) is active.
Press the switch rearward and release to express
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.
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