Ducati Diavel Workshop Manual page 200

Indicating devices
Checking the front and rear brake light switches, neutral light switch, oil pressure switch and clutch switch
Brake light switches
To check the operation of the front (1) and rear (2) STOP lights use a multimeter to check that when the front or rear
brake is pressed, there is electrical continuity (Pos. A) across the terminals of the corresponding switch (Sect. 6 - 11,
Using a multimeter to check the electrical systems, related to the multimeter operation). When the brake is released,
there must be no electrical continuity across the terminals of the corresponding switch (Pos. B). If these tests fail to
produce positive results, the part in question must be renewed.
Gear selector sensor warning light
To check the gear selector warning light switch (3) proceed as follows.
The neutral light does not illuminate on the dashboard.
Remove the electric terminal connected to the neutral switch. Switch on the ignition switch (ignition key to ON position)
and ensure that the light illuminates when the terminal is earthed. If the light switches on, the neutral light switch should
be changed. If the light stays off, switch off the ignition (ignition key set to OFF) to switch off the dashboard and
check for electrical continuity between the neutral switch and engine ECU with a multimeter.
The neutral light on the dashboard is permanently illuminated.