FORD 2014 Expedition v.1 - Manual (Page 36)

If your child restraint system is equipped with a tether strap, and the
child restraint manufacturer recommends its use, Ford also recommends
its use.
CHILD SAFETY LOCKS
When these locks are set, the rear doors cannot be opened from the
inside.
The childproof locks are located on
the rear edge of each rear door and
must be set separately for each
door.
Move the lock control up to engage
the childproof lock.
Move it down to disengage the lock.
Child Safety 35
2014 Expedition (exd)
Owners Guide gf, 1st Printing, June 2013
USA (fus)