Ducati XDIAVEL Owner's Manual page 243

The mechanical part (A) of the key (3) is used to open
the fuel filler cap, the seat latch and bag locks. The
metal part (A) of the key (3) remains hidden inside its
housing, you can take it out by pressing button (B).
Note
With the vehicle in "Key-On" and "engine off"
condition, if the presence of the active key (3) is not
detected for thirty consecutive seconds, the
motorcycle will turn off automatically without any
action by the rider.
242
3
A
B
Fig. 154