Oldsmobile 2001 Silhouette Owner's Manual page 112

The power sliding door override switch(es) will also
stop the door(s) immediately, while the door(s) is
opening or closing, when the override switch(es) is
turned on.
The power sliding door(s) will only open if the transaxle
is in PARK (P). The transaxle does not have to be in
PARK (P) to close the door(s).
2-30
This switch is in front of the
driver's or the passenger's
side sliding door.
If the power sliding door(s) is open or in the process of
closing when you shift out of PARK (P), a buzzer will
sound. This is a warning that the sliding door(s) is not
completely closed.
If the power to the sliding door(s) is turned off, the
buzzer will not sound indicating the door(s) is not
completely closed.
CAUTION:
If you shift the transaxle out of PARK (P) and
accelerate before the power sliding door latches
closed, the door may reverse to the open position.
A child or others could fall out of the vehicle and
be injured. Always make sure the power sliding
door is closed and latched before you drive away.