Pontiac 2005 Montana Owner's Manual page 116

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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.
2-18
If an object obstructs the power sliding door(s) while it is
closing, the door will automatically reverse to the
open position, provided it meets sufficient resistance.
Resistance must be as strong as the force of the closing
door, or stronger. The force of the closing door
increases significantly as the door approaches the
latched position.
The driver's side sliding door is designed to open only
a little if the fuel door is open. If this ever happens,
do not try to force the sliding door. When the fuel filler
door is closed, the driver's side sliding door can be
opened normally.
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CAUTION:
You or others could be injured if caught in the
path of the sliding door. Make sure the door
path is clear before closing the door.
If you want to open the power sliding door(s) when the
override switch(es) is turned off, pull the inside or
outside handle and let go. The door will open fully.