Subaru 2003 Impreza Owner's Manual page 49

Seat, seatbelt and SRS airbags
4. Insert the center seatbelt tongue plate in the cen-
ter seatbelt buckle marked "CENTER" on the left-
hand side until it clicks.
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5. To make the lap part tight, pull up on the shoul-
der belt.
6. Place the lap belt as low as possible on your
hips, not on your waist.