Buick 2001 Century - Manual (Page 127)

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Sunroof (If Equipped)
Your vehicle may be equipped with an express - open
sunroof. It includes a sliding glass panel and a one - piece
sunshade. The control switch works only when the
ignition or retained accessory power is on. See “Retained
Accessory Power” in the Index. The control switch is
located overhead on the headliner.
To open the sunroof to the vent position only, push
and hold the front of the switch. You will need to open
the sunshade by hand. To close the sunroof from the
vent position, push and hold the rear (indented part)
of the switch.
To open the sunroof, push the rear (indented part) of
the switch once. The sunroof and sunshade will open
by themselves. This is the express
- open feature.
To close the sunroof, push and hold the front of the
switch until the sunroof motor stops. The sunshade
can only be closed by hand.