Ducati DIAVEL Owner's Manual page 43

When temperature reading drops until reaching 4°C
(39°F), the ice warning will be enabled. This indication
will be disabled as soon as temperature rises up to
6°C (43°F).
Warning
This warning does not eliminate the possibility
of icy road areas even with temperatures above 4°C
(39°F); when ambient temperature is "low", ride
responsibly, especially on road areas not exposed to
sunlight and/or on bridges.
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Fig. 22