1999 Nissan Altima Owner's Manual - Page 44

After the child restraint is removed and the seat belt is fully retracted, the automatic locking mode (child restraint mode) is canceled. ARS1074 ARS1079 4. Allow the seat belt to retract. Pull up on the seat 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 seat belt out of the retractor. If you cannot pull any more seat belt webbing out of the retractor, the seat 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 1-37