Ford F-150 2018 Owner's Manual page 38

Child Safety
E112197
The childproof locks are located on the
rear edge of each rear door and must be
set separately for each door.
Left-Hand Side
Turn counterclockwise to lock and
clockwise to unlock.
Right-Hand Side
Turn clockwise to lock and
counterclockwise to unlock.
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F-150 (TFC) Canada/United States of America, enUSA, Edition date: 201709, Second Printing