2004 Honda Civic Owner's Manual - Page 44
2004 Honda Civic Manual
Page 44 highlights
Installing a Child Seat 4. After confirming that the belt is locked, grab the shoulder part of the belt near the buckle and pull up to remove any slack from the lap part of the belt. Remember, if the lap part of the belt is not tight, the child seat will not be secure. To remove slack, it may help to put weight on the child seat, or push on the back of the seat while pulling up on the belt. 5. Push and pull the child seat forward and from side to side to verify that it is firmly secured. If the child seat is not secure, unlatch the belt, allow it to retract fully, then repeat these steps. To deactivate the locking mechanism and remove a child seat, unlatch the buckle, unroute the seat belt, and let the belt fully retract. Driver and Passenger Safety 41