The activation of this (amber yellow) "warning" indicates that the hands free system has detected that the battery that permits the active key (1, fig. 62) To communicate and turn the vehicle on is almost discharged.
Note
In this case, ducati recommends replacing the battery as soon as possible as described in the paragraph "replacing the active key battery" (page 88).

Hands free key (hf) not recognised
High engine coolant temperatureStored lap display function
This function displays the stored laps.
To access the function it is necessary to view the "setting" menu page 48, using
button (1, fig. 14) ?"" or (2, fig.
14) ?" " select the "lap" function and
press the reset button
(12, fig. 12) To go to next pag ...
Removal of the licence plate holder
Disconnect connector (5) of the number plate holder wiring from the main one.
Release the number plate holder light cable from the ties and the cable grommets
as indicated in sect- 7 - 6, flexible
wiring/hoses positioning, since the cable is together with the rear abs sensor
cable.
...
Flywheel - alternator
Screw
Alternator stator
Plug
Sealing ring
O-ring
Cover
Screw
Aluminium gasket
Screw
Bracket
Locating bush
Screw
generator cover
Flange
Flanged nut
Plane washer
Flywheel
Washer
Inner ring
Needle roller bearing
Electric starter driven gear
Starter clutc ...