Turn the knurled ring to 
.
The warning light 
on the instrument
cluster will come on.
See also:
Cruise control
It is a device able to support the driver, with electronic control, which allows
driving at speed over 30 km/h on long and straight dry roads (e.g.: motorways),
at a desired speed, without pressin ...
Pretensioners
To increase the efficiency of the front seat belts, the Fiat Punto is fitted
with pretensioners. These devices “feel”, through a sensor, that a violent crash
is in progress and rewind the seat bel ...
Manually deactivating passenger’s front air bag (where required)
Should it be absolutely necessary to carry a child on the front seat, the passenger’s
air bag on the car can be deactivated.
Deactivation/reactivation takes place with ignition key at STOP and op ...