Mercedes-Benz AMG GT Operator's Manual page 377

Warning/indicator lamp Possible causes/consequences and
7
The red seat belt warning lamp flashes and an intermittent warning tone sounds.
or
The red seat belt warning lamp will light up for six seconds once the engine has started.
Seat belt warning lamp
In addition, an intermittent warning tone may sound.
*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 vehicle is in motion.
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There are objects on the front passenger seat.
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*The red seat belt warning lamp will light up once the engine 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.
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If you have placed objects on the front passenger seat, the red seat belt warning lamp may remain lit.
M M
Fasten your seat belt ( page 34).
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Remove the objects from the front passenger seat.
Fasten your seat belt ( page 34).
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Display messages and warning/indicator lamps 375
Solutions