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 temperatureHow to start the engine
With the motorcycle off and the dashboard on, the on/off switch is turned to
"run off"
With the motorcycle and dashboard on, the on/off switch is turned to "run
off".
To start the engine, simply push the on/off switch up to "run on" and press the
black start button.
...
Fuel tank
fuel tank
Rubber pad
Spacer
Screw
Hose
Tray
Y-fitting
Hose
Hose
Filler cap
Screw
Complete hose guide
Screw
Hose clip
Hose
Screw
Screw
Sealing washer
Screw
Flange
Sealing washer
Spare parts catalogue
Diavel abs fuel tank
Diavel abs fuel system
Diav ...
Residual range indication when the service is due
After resetting the first oil service warning (triggered at
1000 km), upon every key-on the system displays the
indication of which type of service should be performed next
(oil service or desmo service) and the residual range.
A (green) warning (1, fig. 32) Is activated for 2 seconds on
ever ...