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:
Fuel Requirements
Your vehicle is designed to meet all emission regulations and provide satisfactory
fuel economy and performance when using high-quality unleaded gasoline having an
octane range of 87 to 91. The ...
Battery
The battery is of the “Limited maintenance” type: under normal conditions of
use the electrolyte does not need topping up with distilled water.
CHECKING THE CHARGE fig. 22
The battery charge may b ...
Engine starting
The car is fitted with an electronic engine lock device. If the engine fails
to start, see paragraph “Fiat Code system” in section “Dashboard and controls”. ...