1996 Mercury Sable Owner's Manual - Page 153

To set the childproof lock on each rear door, open the rear door. Find the lever inside the label. Move the lever up to the locked symbol. To release the childproof lock, open the rear door from the outside. Move the lever down to the unlocked symbol. Power Door Locks (If equipped) If your vehicle has power door locks, the controls to lock the doors are on the trim panel of the front door. When you close the doors after you set the door locks, the doors remain locked. If the power mechanism ever fails, the manual door lock will override the power controls. The power locks on the driver's door If the key is left in the driver's or passenger's outside lock cylinder for a period of time, the power door locks may cycle. This is a protective feature and will not harm the locks. When the key is removed, the locks will function normally. 126