1998 Nissan Altima Owner's Manual - Page 42

After the child restraint is removed and the seat belt is allowed to wind back into the retractor, the automatic locking mode (child restraint mode) is canceled; the seat belt only locks during a sudden stop or impact. ARS1074 ARS1079 4. Allow the belt to retract. Pull up on the belt to remove any slack in the belt. 5. Before placing the child in the child restraint, use force to tilt the child restraint from side to side, and tug it forward to make sure it is securely held in place. 6. Check that the retractor is in the automatic locking mode by trying to pull more belt out of the retractor. If you cannot pull any more belt webbing out of the retractor, the belt is in the automatic locking mode. 7. Check to make sure the child restraint is properly secured prior to each use. If the lap belt is not locked, repeat steps 3 through 6. Seats, restraints and supplemental air bag systems 1-35