Subaru 2001 Legacy Owner's Manual page 48

Seat, seatbelt and SRS airbags
HS1019BA
n Unfastening the seatbelt
Push
HS0317
Push the release button of the center seatbelt buckle (on the left-hand
side) to unfasten the seatbelt.
NOTE
When the seatback is folded down for greater luggage space, it is
necessary to disconnect the connector.
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