Buick 2001 Park Avenue - Manual (Page 116)

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Front Reading Lamps
These lamps and the interior courtesy lamps will come
on when you open a door. They will turn off when you
turn on the ignition.
To turn on the front seat reading lamps when the doors
are closed, press the button behind the lamp you want
on. Press it again to turn the lamp off.
These lamps work even when the ignition is off.
Rear Reading Lamps
To turn on a rear seat reading lamp, press the switch
above that rear door. To turn off the reading lamp, press
the switch again.