Subaru 2004 Legacy Owner's Manual page 49

Seat, seatbelt and SRS airbags
retracted properly to avoid catching the belt webbing
in the door.
Rear seatbelts (except rear center seatbelt on
wagon)
1. Sit well back in the seat.
2. Pick up the tongue plate and pull the belt out slowly.
Do not let it get twisted. If the belt stops before reach-
ing the buckle, return the belt slightly and pull it out
more slowly. If the belt still cannot be unlocked, let the
belt retract slightly after giving a strong pull on it, then
pull it out slowly again.
3. Insert the tongue plate into the buckle until you
hear a click.
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4. To make the lap part tight, pull up on the shoulder
belt.
5. Place the lap belt as low as possible on your hips,
not on your waist.
HS1050BA
HS1051BA