Toyota is recalling roughly 550,000 Highlander SUVs due to a supplier defect that could cause the seat backs to fail to lock properly, increasing the risk of injury.The recall affects Highlander and Highlander Hybrid vehicles, model years 2021 to 2024, equipped with recliner technology in the second-row seats. The technology is intended to allow occupants to adjust the angle of the seats and then lock them in place. But the assembly teeth on the recliners may fail to fully engage in a locked position when the seat back is being adjusted, according to the National Highway Traffic Safety Administration (NHTSA)."A seat back that has not been secured in a locked position may fail to properly restrain occupants, increasing the risk of injury in the event of a crash at higher speeds," the recall notice said.The defective recliner technology was made by Toyota Boshoku Indiana, according to NHTSA.…