Pontiac 2005 Montana Owner's Manual page 112

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CAUTION:
If your vehicle is facing downward on a steep
grade (15 percent or more), the door may not
stay open and could slam shut, possibly
injuring someone. To make sure the door does
not slam shut be sure to hold it open until
everyone is clear of the door, and only then
allow it to slowly close.
2-14
Lock either sliding door from inside the vehicle by
moving the manual lever down. Unlock it by moving
the lever up.
With the power door locks, the sliding door lock has a
delay feature. See Power Door Locks on page 2-10 and
Vehicle Personalization on page 2-57 .