CITROËN DS5 Owner's Handbook Manual page 120

Reactivation
Press the "ECO OFF" switch again.
The system is active again; this is confirmed
by the switch warning lamp going off and a
message in the screen.
The system is reactivated automatically
at every new start using the START/
STOP button.
Operating fault
In the event of a fault with the system, the
"ECO OFF" switch warning lamp flashes then
comes on continuously.
Have it checked by a CITROËN dealer or a
qualified workshop.
In the event of a fault in STOP mode, the
vehicle may stall. It is then necessary to switch
off the ignition and start the engine again using
the START/STOP button.
Maintenance
Before doing anything under the bonnet,
deactivate the Stop & Start system to
avoid any risk of injury resulting from
automatic operation of START mode.
This system requires a 12 V battery with a
special specification and technology (reference
numbers available from CITROËN dealers).
Fitting a battery not listed by CITROËN
introduces the risk of malfunction of the system.
For charging, use a 12 V charger and do not
reverse the polarity.
The Stop & Start system makes use of
advanced technology. For any work on
the system go to a qualified workshop
with the skills and equipment required,
which a CITROËN dealer is able
to provide.