Ducati Diavel Carbon Owner's Manual page 147

Indication of incorrect position of the red
button.
This message tells you that the button should be
returned to the "top" position in order to ensure that
there is not an excessive current absorption by the
system.
Important
This could lead to battery discharge within a
short time.
Any incorrect position is detected within the first 60
seconds after vehicle switch-off (Key-Off).
If you press the starter button (8) for over 1 second
to switch off (Key-Off), system activates the warning
"RED SWITCH NOT RELEASED" as a flashing
message.
RED SWITCH NOT RELEASED
Fig 88
8
Fig 89
145