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 temperatureRemoving the silencer
Loosen the clamp (38) that retains the silencer (4) to the complete exhaust
system.
While holding the nut (8), loosen the screw (1) and remove the silencer (4)
from the motorcycle.
Loosen the screws (40) and remove the silencer guard (41).
...
Removal of the swingarm
Before removing the parts in question, you must first carry out the following
operations:
Remove the rear wheel eccentric hub as described in chapter "removal of the
rear wheel eccentric hub and rear wheel
shaft" of this section.
Loosen screws (7) and remove the hose grommets (13), (15) ...
Air intake
Air filter
Right air duct
Screw
Air temperature sensor
Screw
Left air duct
Sealing washer
Threaded insert
Spacer
Clamp
Breather hose
Spare parts catalogue
Diavel abs air intake - oil breather
Diavel carbon
abs
air intake - oil breather
Important
Bold reference num ...