CITROËN DS5 Owner's Handbook Manual page 46

Service overdue
For 5 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 186 miles
(300 km).
For 5 seconds after the ignition is switched on,
the screen indicates:
5 seconds after the ignition is switched on,
the distance recorder resumes its normal
operation. The spanner remains on .
With Blue HDi Diesel versions, the
Service warning lamp also comes on
when the ignition is switched on.
The distance remaining may be
weighted by the time factor, depending
on the driving conditions.
Therefore, the spanner may also come
on if you have exceeded the period
since the last service, indicated in the
maintenance and warranty guide.
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 trip distance recorder
zero reset button,
 switch on the ignition; the distance recorder
display begins a countdown,
 when the display indicates "=0" , release
the button; the spanner disappears.
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 taken into account.
Retrieving the service
information
You can access the service information at any
time.
 Press the trip distance recorder zero reset
button.
The service information is displayed for a few
seconds, then disappears.