2010 Nissan Altima Owner's Manual - Page 49

6. Check to make sure the child restraint is properly secured prior to each use. If the child restraint is loose, repeat steps 2 through 5. LRS0674 WRS0256 Rear-facing - step 5 5. After attaching the child restraint, test it before you place the child in it. Push it from side to side while holding the child restraint near the LATCH attachment path. The child restraint should not move more than 1 inch (25 mm), from side to side. Try to tug it forward and check to see if the LATCH attachment holds the restraint in place. If the restraint is not secure, tighten the LATCH attachment as necessary, or put the restraint in another seat and test it again. You may need to try a different child restraint or try installing by using the vehicle seat belt (if applicable). Not all child restraints fit in all types of vehicles. REAR-FACING CHILD RESTRAINT INSTALLATION USING THE SEAT BELTS 1-30 Safety-Seats, seat belts and supplemental restraint system