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:
23. Anti-Lock Brake (ABS) Light
This light monitors the Anti-Lock Brake System (ABS). The light will turn on
when the ignition switch is turned to the ON/RUN position and may stay on for as
long as four seconds.
If the ABS li ...
17. Oil Pressure Warning Light
This light indicates low engine oil pressure. The light should turn on momentarily
when the engine is started. If the light turns on while driving, stop the vehicle
and shut off the engine as so ...
Front fog lights
(green)
The warning light turns on when the front fog lights are turned on. ...