NISSAN 2011 LEAF - Owner's Manual - Manual (Page 116)

Front-facing — step 5
5. Allow the seat belt to retract. Pull up on the
shoulder belt to remove any slack in the belt.
Front-facing — step 6
6. Remove any additional slack from the seat
belt. Press downward and rearward firmly in
the center of the child restraint with your
knee to compress the vehicle seat cushion
and seatback while pulling up on the seat
belt.
7. Tighten the tether strap according to the
manufacturer’s instructions to remove any
slack.
Front-facing — step 8
8. After attaching the child restraint, test it
before you place the child in it. Push it from
side to side while holding the child restraint
near the seat belt path. The child restraint
should not move more than 1 inch (25 mm)
from side to side. Try to tug it forward and
check to see if the belt holds the restraint in
place. If the restraint is not secure, tighten
the seat belt as necessary, or put the
restraint in another seat and test it again.
You may need to try a different child
restraint. Not all child restraints fit in all
types of vehicles.
Safety—Seats, seat belts and supplemental restraint system 1-31