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:
Rear Park Assist Sensors
The four Rear Park Assist sensors, located in the rear fascia/bumper, monitor
the area behind the vehicle that is within the sensors’ field of view. The sensors
can detect obstacles, in the horizo ...
Scheduled servicing
Correct maintenance of the vehicle is essential for ensuring it stays in tiptop
condition for a long time to come.
This is why Fiat has programmed a series of checks and maintenance operations
ev ...
Deactivation
Turn the ignition key to STOP.
At the following starting operation (key at MAR), the sensor will not be reactivated
even is the stalk is on (B). In this event, to activate the rain sensor, you have ...