Seat ALTEA FREETRACK Owner's Manual page 22

20 Seat belts
After the ignition has been switched on, the control lamp  on the instru-
1)
ment panel lights up if the driver has not fastened his/her seat belt, and
an audible warning is heard if the vehicle is driven at more than 30 km/h
(20 mph).
The warning lamp*  is switched off if the driver seat belt is fastened while
the ignition is switched on.

1)
Depending on the version of the model.