Lincoln NAUTILUS 2021 Supplemental Owner's Manual page 17

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4. Insert the belt tongue into the proper
buckle (the buckle closest to the direction
the tongue is coming from) for that
seating position until you hear a snap and
feel the latch engage. Make sure the
tongue is latched securely by pulling on
it.
2021 Nautilus (CD9) Canada/United States of America, enUSA, Edition date: 202011, First-Printing
Child Safety
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5. To put the retractor in the automatic
locking mode, grasp the shoulder portion
of the belt and pull downward until you
pull all of the belt out.
Note: The automatic locking mode is
available on the front passenger and rear
seats.
6. Allow the belt to retract to remove slack.
The belt clicks as it retracts to indicate it
is in the automatic locking mode.
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7. Try to pull the belt out of the retractor to
make sure the retractor is in the
automatic locking mode. You should not
be able to pull more belt out. If the
retractor did not lock, unbuckle the belt
and repeat Steps 5 and 6.
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8. Remove remaining slack from the belt.
Force the seat down with extra weight,
for example, by pressing down or
kneeling on the child restraint while
pulling up on the shoulder belt in order
to force slack from the belt. This is
necessary to remove the remaining slack
that exists once you add the extra weight