Ford 1998 Windstar Owner's Manual page 112

To release the childproof lock:
Open the sliding door from the outside.
1.
Push the lever to the down position.
2.
Power Door Locks (If equipped)
The power door lock control switches are located in the panels
of the front doors. They control the locks on both front doors,
the sliding door and the liftgate. To lock all doors, push the
raised side of the switch. To unlock the doors, push the recessed
side of the switch.
The power door lock switch
Door locks can also be operated from the power door lock
switch in the cargo area.
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