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:
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 ...
Convertible Top Care – If Equipped
NOTE: Lubricate the top rails with Berulub FR 43 every 2000 cycles or if scratching
noises due to dust are present.
CAUTION!
Failure to follow these cautions may cause interior water damage, sta ...
Driving style
Starting
Do not warm the engine with the car at a standstill or at idle or high speed:
under these conditions the engine warms up much more slowly, increasing electrical
consumption and emissions ...