Ducati DIAVEL Owner's Manual page 179

Warning
The side stand must be fully up (in a horizontal
position) as its safety sensor prevents engine start
when down.
After Key-On, but with the engine not yet started, the
system will perform a Key-Off automatically if the
presence of the active key is not detected within 10
seconds.
Note
It is possible to start the engine with side stand
down and the gearbox in neutral. When starting the
motorcycle with a gear engaged, pull the clutch lever
(in this case the side stand must be up).
Move the red switch (1) up to uncover the black
button (4).
Push the button (4) to start the engine.
178
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4
Important
Do not rev up the engine when it is cold. Allow
some time for oil to be heated and reach all points
that need lubricating.
The red oil pressure warning light should go out a few
seconds after the engine has started.
The engine will shut off by turning the red key (1) on
the handlebar to RUN OFF.
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4
Fig. 130