Honda 1990 Civic Sedan Owner's Manual page 112

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Shoulder Belt Buckle (Sedan) (cont'd)
4. Remove the cover located on the center pillar.
5. Set the wrench extension into the wrench grip (both provided 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