Mercedes-Benz E-Class Operator's Manual page 406

404 Display messages and warning/indicator lamps
Seat belts
Warning/indicator lamp
7
Seat belt warning lamp
7
Seat belt warning lamp
Possible causes/consequences and
After starting the engine, the red seat belt warning lamp lights up for 6 seconds.
In addition, an acoustic warning tone may sound.
The seat belt warning lamp reminds the driver and front passenger to fasten their seat belts.
Fasten your seat belt .
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If you have placed objects on the front passenger seat, the warning lamp may stay lit.
The red seat belt warning lamp flashes and an intermittent warning tone sounds.
The driver or front passenger has not fastened their seat belt while the engine is in motion.
Fasten your seat belt .
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There are objects on the front passenger seat.
Remove the objects from the front passenger seat.
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