HANDBRAKE ON (red)
Turning the ignition key to MAR the warning light turns on, but it should go off after few seconds.
Low brake fluid level
The warning light turns on when the level of the brake fluid in the reservoir falls below the minimum level, due to possible leak in the circuit.
On certain versions the dedicated message is displayed.
If the warning light 
turns on
when traveling (on certain versions together with the message on the display) stop
the vehicle immediately and contact Fiat Dealership.
Handbrake on
The warning light turns on when the handbrake is on.
On certain versions, if the vehicle is moving the buzzer will also sound.
IMPORTANT If the warning light turns on when traveling, check that the handbrake is not engaged.
See also:
Start&Stop system and Gear Shift Indicator
With respect for the environment and fuel economy still in mind, the new
model implements a system called Start&Stop. Standard on all engines, this
device temporarily stops the engine and rest ...
Rubber hoses
As far as the brake system and fuel rubber hoses are concerned, carefully follow
the “Service schedule” in this section.
Indeed ozone, high temperatures and prolonged lack of fluid in the system ma ...
Heated rear window
The warning light on the dial turns on when the heated rear window is turned
on. ...