If the child seat is not properly secured in the event of a crash, it can increase the risk of injury.
Certain second-row or third-row rear seatbelts retractor assemblies may not automatically lock when the seatbelt is fully pulled out of the retractor, possibly preventing a child seat from being properly secured. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."
What to do: Book this in with a dealer now. It affects a safety system.