An audible chime that does not properly alert the driver to fasten their seat belt increases the risk of injury in a crash.
The receiver audio module control unit software may fail to properly generate audible seat belt warnings to the driver to fasten their seat belt. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 208, "Occupant Crash Protection."
What to do: Book it in at your next service. There is no deadline and no charge.