Ducati Diavel Owner's Manual page 143

Press (2, fig. 128) for at least 3 seconds: The indication of the
E
activated function (fig. 129) will appear on the display of the
dashboard on tank for 5 seconds and the lights will remain on
for 2 hours. After this period of time, they will turn off
automatically.
Note
If there is a sudden interruption in the battery voltage
during the "Parking" function, the dashboard will disable this
function when the voltage is restored.
Important
The frequent use of this function can considerably
reduce the battery charge; it is recommended to use this
function only when necessary.
Warning
The exhaust system may still be hot even after engine
is switched off; take special care not to touch the exhaust
system with any part of your body and do not park the
motorcycle next to inflammable material (wood, leaves, etc.).
Warning
Using padlocks or other locks designed to prevent
motorcycle motion, such as brake disc locks, rear sprocket
locks, and so on is dangerous and may impair motorcycle
operation and affect the safety of rider and passenger.
142
2
PARKING
fig. 128
fig. 129