Seat Belt Warning Lamp - Mercedes
The red seat belt warning lamp flashes and an intermittent warning tone sounds. The driver or front passenger has not fastened the seat belt while the vehicle is in motion. Fasten your seat belt. If there are objects on the front passenger seat, remove the objects from the front passenger seat.
The red seat belt warning lamp lights up for six seconds once the vehicle has started. In addition, an intermittent warning tone may sound. The red seat belt warning lamp reminds the driver and front passenger to fasten their seat belts. Fasten your seat belt. If you have placed objects on the front passenger seat, the red seat belt warning lamp may remain lit.