Chevrolet 2009 Express Owner's Manual page 91

To open the front portion of a 60/40 door from the inside,
pull the handle toward you and push the door open.
To open the rear portion of a 60/40 door from the outside,
pull the handle on the side of the rear door and pull the
door toward you.
To close the 60/40 side doors, close the rear door first.
Then close the front door. Check to make sure that both
doors are completely closed.
The front side swing-out door has a check strap assembly
in the door frame to keep the door from opening beyond
90 degrees.
To open the door beyond 90 degrees, close the door
partially, pull the check strap toward you and then open
the door. When the door is closed, the check strap will
automatically re-engage.
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