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:
Failure warnings
In case of parking sensor failure, the driver is warned when engaging reverse
by high sound warning (for 3 seconds). ...
Front fog lights
Contact Fiat Dealership to have front fog lights A-fig. 22 replaced.
...
Parking
Switch off the engine, pull up the handbrake and engage a gear (1st gear or reverse,
according to whether the vehicle is facing up or downhill) and leave the wheels
turned. If the vehicle is left ...