Buick TERRAZA 2006 - Manual (Page 95)

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.
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