Subaru 2004 Impreza Owner's Manual page 63

Seat, seatbelt and SRS airbags
3. Insert the tongue plate into the buckle until you
hear a click.
4. Take up the slack in the lap belt.
5. Pull out the seatbelt fully from the retractor to
change the retractor over from the Emergency Lock-
ing Retractor (ELR) to the Automatic Locking Retrac-
tor (ALR) function. Then, allow the belt to rewind into
the retractor. As the belt is rewinding, clicks will be
heard which indicate the retractor functions as ALR.
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6. Push and pull the child restraint system forward
and from side to side to check if it is firmly secured.
Sometime a child restraint can be more firmly secured
by pushing it down into the seat cushion and then
tightening the seat belt.
7. Pull at the shoulder portion of the belt to confirm
that it cannot be pulled out (ALR properly functioning).