Chevrolet 2005 Express Van Owner's Manual page 92

To open the rear doors from the outside, pull the
handle toward you to open the passenger's side rear
door first.
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To open the driver's side rear door, pull the latch
release at the inside edge of the door.
To close the rear doors, close the driver side rear door
first. Then, close the passenger side rear door.
Check to make sure both doors are completely closed.