CITROEN DS4 Owner's Handbook Manual page 58

Service overdue
For a few seconds after the ignition is switched on,
the spanner flashes to indicate that the service
must be carried out as soon as possible.
Example: the service is overdue by 180 miles
(300 km).
For a few seconds after the ignition is switched on,
the screen indicates:
A few seconds after the ignition is switched
on, the distance recorder resumes its normal
operation. The spanner remains on .
The distance remaining may be
weighted by the time factor, depending
on the type of driving.
Therefore, the spanner may also come
on if you have exceeded the two year
service interval.
Service indicator zero reset
After each service, the service indicator must
be reset to zero.
The procedure for resetting to zero is as
follows:
 switch off the ignition,
 press and hold the ".../000" trip distance
recorder zero reset button,
 switch on the ignition; the distance recorder
display begins a countdown,
 when the screen indicates "=/0" and the
spanner disappears, release the button.
This operation cannot be carried
out while a reminder of the servicing
information is being displayed.
Following this operation, if you wish to
disconnect the battery, lock the vehicle
and wait at least five minutes for the
zero reset to be registered.
Recalling the service information
You can recall the service information at any
time.
 Briefly press the ".../000" trip distance
recorder zero reset button.
The service information is displayed for a
few seconds, in the total distance recorder
line or in the type 2 instrument panel
central screen.