Turn the knurled ring to 
.
The warning light 
on the instrument
cluster will come on.
See also:
Installation of electric / electronic devices
Electric/electronic devices installed after buying the car or in aftermarket
shall bear the and marking:
Fiat Auto S.p.A. authorizes the installation of transceivers provided that installation
...
Engine oil
1.28V versions
1.3 Multijet versions
Checking engine oil
Check the oil level a few minutes (about 5) after the engine has stopped, with
the car parked on level ground.
Check that the level i ...
Heated Seats — If Equipped
On some models, the front driver and passenger seats may be equipped with heaters
in both the seat cushions and seatbacks. The controls for the front heated seats
are located on the center instrum ...