Oldsmobile 1999 Silhouette - Manual (Page 120)

yellow blue
2-24
Sliding Door Lock
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.