Ducati Diavel Carbon ABS Owner's Manual page 100

Indication of incorrect position of the red starter
button
This message indicates to the user 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 in 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 (1, fig. 77) for over 1 second to
switch off (Key-Off), system activates the warning "RED
SWITCH NOT RELEASED" as a flashing message (fig. 76).
RED SWITCH NOT RELEASED
E
fig. 76
1
fig. 77
99