1999 GMC Sierra 1500 Pickup Owner's Manual - Page 59

6. To tightenthebelt,pullitsfreeendwhileyoupushdownonthechild restraint. 7. Pushandpullthechildrestraintindifferentdirectionstobesureit is secure. If the child restraint isn't secure, turn the latch plate over and in buckle it again.Thensee if it issecure. If it isn't,securetherestraint a different place in the vehicle and contact the child restraint maker for thei r advice. To removethechildrestraint,justunbucklethevehicle'ssafetybelt. ready to work for an adult or larger child passenger. Securing a Child Restraint in the Center Seat Position (Extended Cab) I It will be PO700 You'llbe using the lap belt. childrestrainthasone. See the earlier part about the top strap if the 145