2005 Chevrolet Blazer Owner's Manual - Page 13

To raise the seatbacks, lift up the seatbacks and pull up. Push and pull on the seatbacks to check that the latches have locked in the upright position. If they haven't, see your dealer for service. Push and pull on the head restraints to check that they have locked in the upright position. If they haven't, see your dealer for service. {CAUTION: If the seatback is not locked, it could move forward in a sudden stop or crash. That could cause injury to the person sitting there. Always press rearward on the seatback to be sure it is locked. {CAUTION: To return the head restraints to the upright position, reach behind the seats and pull the head restraint up until it locks into position. On two-door models with an inside mounted spare tire, the driver's side rear seat head restraint must be lifted and held upright as the seatback is raised. Otherwise, the head restraint will hit the spare tire and prevent the seatback from properly latching. A safety belt that is improperly routed, not properly attached, or twisted will not provide the protection needed in a crash. The person wearing the belt could be seriously injured. After raising the rear seatback, always check to be sure that the safety belts are properly routed and attached, and are not twisted. 1-7