Fiat 500 Abarth Owner's Manual page 263

3. However, after driving the vehicle for up to 20 min-
utes above 15 mph (24 km/h), the Tire Pressure
Monitoring Telltale Light will flash on and off for
75 seconds and then remain on solid and the Tire
Pressure Monitoring Unavailable message will be
displayed.
4. For each subsequent ignition key cycle, a chime will
sound and the Tire Pressure Monitoring Telltale Light
will flash on and off for 75 seconds and then remain on
solid and the "Tire Pressure Monitoring Unavailable"
message will be displayed.
5. Once you repair or replace the original road tire and
reinstall it on the vehicle in place of the compact spare
tire, the TPMS will update automatically and the Tire
Pressure Monitoring Telltale Light will turn OFF, as
long as no tire pressure is below the low-pressure
warning limit in any of the four active road tires. The
vehicle may need to be driven for up to 20 minutes
above 15 mph (24 km/h) in order for the TPMS to
receive this information.
Enhanced TPM System
When the vehicle is equipped with an enhanced TPM
system, the driver can view text messages showing the
actual tire pressure value by position by selecting the tire
pressure menu command in the instrument cluster. Refer
to "Instrument Panel Features" in "Understanding Your
Instrument Panel" for further information.
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