Honda 1990 Accord Sedan Owner's Manual page 122

4. Remove the cover located on the center pillar.
5. Set the wrench extension into the wrench grip (both provid-
ed in the tool bag) then insert the wrench into the socket and
turn it counterclockwise until the shoulder belt buckle
reaches its rear locked position.
WRENCH GRIP
NOTE: After the manual operation, make sure that the seat
belt warning light is off and the shoulder belt buckle is seated
properly in its locked position.
6. Replace the cover on the center pillar.
7. Reinstall the fuse, the fuse remover and both fuse box
covers.
COVER
WRENCH
EXTENSION
WRENCH