Mercedes-Benz GL-Class 2012 Owners Manual - Manual (Page 260)

Warning and indicator lamps in the instrument cluster
Seat belts
Problem Possible causes/consequences and M Solutions
7
After starting the
engine, the red seat
belt warning lamp lights
up for six seconds. The seat belt warning lamp reminds the driver and front passenger
to fasten their seat belts.
X Fasten your seat belt ( Y page 55).
7
After starting the
engine, the red seat
belt warning lamp lights
up. In addition, a
warning tone sounds
for up to six seconds. G Risk of injury
The driver's seat belt is not fastened.
X Fasten your seat belt ( Y page 55).
The warning tone ceases.
7
The red seat belt
warning lamp lights up
after the engine starts,
as soon as the driver's
or the front-passenger
door is closed. G
Risk of injury
The driver or front passenger has not fastened their seat belt.
X Fasten your seat belt ( Y page 55).
The warning lamp goes out.
G
Risk of injury
There are objects on the front-passenger seat.
X Remove the objects from the front-passenger seat and stow
them in a secure place.
The warning lamp goes out.
258
Warning and indicator lamps in the instrument cluster
On-board computer and displays