GMC 1993 Safari Owner's Manual page 65

I -
Rear Doors
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PO41 2
To open the rear doors from the outside, open the right rear door first. Grasp
the handle and pull the door open.
To open the left rear door, pull on the latch release handle
in the inside of
the door.
To close the rear doors, close the left door first. Check to make sure both
doors are completely closed.
The rear doors have a check assembly to keep the doors from opening
beyond
90".
2-7