FORD 2003 F-150 v.4 - Manual (Page 79)

Childproof door locks (if equipped)
When these locks are set, the rear
doors cannot be opened from the
inside. The rear doors can be
opened from the outside when the
doors are unlocked.
The childproof locks are located on
rear edge of each rear door and
must be set separately for each
door. Setting the lock for one door
will not automatically set the lock
for both doors.
Move lock control up to engage the
childproof lock. Move control down
to disengage childproof locks.
INTERIOR TONNEAU COVER RELEASE (IF EQUIPPED)
Your vehicle is equipped with a mechanical interior tonneau cover
release handle that provides a means of escape for children and adults in
the event they become locked inside the pickup box.
Adults are advised to familiarize themselves with the operation and
location of the release handle.
Locks and Security
79