Turning the key to MAR the warning light on the dial turns on, but it should go off as soon as the engine is started.
If the 
warning light turns on when
the car is travelling (on certain versions together with the message on the display),
stop the engine immediately and contact a Fiat Dealership.
See also:
Seat Belt Extender
If a seat belt is too short, even when fully extended, and when the adjustable
upper shoulder belt anchorage (if equipped) is in its lowest position, your authorized
dealer can provide you with a ...
REAR WINDOW AND DOOR MIRROR DEMISTING/DEFROSTING (where required)
Press to turn this function on.
Activation is indicated by the turning on of the warning light
on the instrument panel.
This function is timed and switches off automatically after 30 minutes. To ...
Car protection system failure - fiat code
Turning the key to MAR the warning light on the dial shall flash only once and
then go off. If with the ignition key at MAR the warning light stays on, this indicates
a possible failure (see “Th ...