Subaru 2003 Impreza Owner's Manual page 48

2. After drawing out the seatbelt, pass it through the
belt guide as follows: First insert one edge of the
belt into the open gap in the comfort guide; then
slide the rest of the belt in, so that the whole belt fits
inside.
Seat, seatbelt and SRS airbags
3. After confirming that the webbing is not twisted,
insert the connector (tongue) attached at the web-
bing end into the buckle on the right-hand side until
a click is heard.
If the belt stops before reaching 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 it a strong pull, then pull it out slowly
again.
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