1999 Nissan Sentra Owner's Manual - Page 37

After the child restraint is removed and the seat belt is fully retracted, the automatic locking mode (child restraint mode) is canceled. To install the anchor bracket, a metric bolt of the dimensions listed below must be used. Bolt diameter: 8.0 mm Bolt length: at least 1.18 in (30 mm) Thread pitch: 1.25 mm Secure the top strap to the attaching bolt which provides the straightest installation of the top strap. WARNING Child restraint anchor points are designed to withstand only those loads imposed by correctly fitted child restraints. Under no circumstances are they to be used for adult seat belts or harnesses. ARS1015 TOP STRAP CHILD RESTRAINT If your child restraint has a top strap, it must be secured to the provided anchor point. Anchor bracket hardware must be installed. The top strap anchor bracket hardware is available through an authorized NISSAN dealer. U.S. Part #88894-89900 Canadian Part #88894-89902 Secure the child restraint with the center lap belt or the lap portion of the outboard Threepoint belt and latch the top strap hook onto the anchor bracket. 1-30 Seats, restraints and supplemental air bag systems