When the knurled ring is at 
push
the lever towards the dashboard (stable position).
The warning light 
on the instrument
cluster will come on.
Pulling the lever towards the steering wheel again, the main beams are turned off and the dipped beams on.
See also:
Reconfigurable multifunction display
The “Multifunction display” shows all the useful information necessary when driving,
more particularly: ...
Supplemental Restraint System (SRS) — Air Bags
This vehicle has Advanced Front Air Bags for both the driver and front passenger
as a supplement to the seat belt restraint systems. The driver’s Advanced Front
Air Bag is mounted in the center of ...
Diesel fuel filter sensor failure
The warning light on the dial comes on (on certain versions together with the
message on the display) when dieel fuel filter sensor failure is detected. Contact
Fiat Dealership as soon as poss ...