Fiat 500 C Owner's Handbook Manual page 48

Entering the secret code
When the radio is switched on, if the
secret code is requested, the display
will show the word "Code" for about 2
seconds, followed by four dashes
"- - - -".
The secret code is made up of four
digits from 1 to 6, each corresponding
to one of the dashes.
To enter the first digit of the code, press
the corresponding button of the preset
stations (from 1 to 6). Enter the other
code digits in the same way.
If the four digits are not entered within
20 seconds, the display will show
"Enter code - - - -". This event is not
considered as incorrect entering of the
code.
After entering the fourth digit (within 20
seconds), the radio will work.
If an incorrect code is entered, the radio
will emit a sound and the display shows
the text "Radio blocked/wait" to notify
the user of the need to enter the
correct code.
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Each time the user enters an incorrect
code, the waiting time will gradually
increase (1 min, 2 min, 4 min, 8 min, 16
min, 30 min, 1 h, 2 h, 4 h, 8 h, 16 h, 24
h) up to a maximum of 24 hours. The
waiting time will be shown on the
display with the text "Radio
blocked/wait". After the message
disappears, the code entering
procedure may be started again.
Vehicle radio passport
This document certifies ownership of
the car radio. The car radio passport
shows the radio model, serial number
and secret code.
WARNING Keep the car radio passport
in a safe place so that you can give the
information to the relevant authorities if
the radio is stolen.
In the case of loss of the car radio
passport, contact the Fiat Dealership,
taking an ID document and the car
ownership documents.