CITROËN DS 5 Handbook page 186

dynamic stability control (dSc)
and anti-slip regulation
(ASR)
Activation
These systems are activated automatically
each time the vehicle is started.
As soon as they detect a problem of grip or
trajectory, these systems act on the operation if
the engine and brakes.
This is indicated by flashing of this
warning lamp in the instrument panel.
deactivation
In exceptional conditions (starting a vehicle
which is bogged down, stuck in snow, on soft
ground...), it may be advisable to deactivate
the DSC and ASR, so that the wheels can turn
freely and regain grip.
Reactivate the systems as soon as the level of
grip permits.
F Press this button.
The indicator lamp in the button
comes on.
The DSC and ASR systems no longer act
on the operation of the engine and on the
brakes in the event of a involuntary change of
trajectory.
Reactivation
The systems are reactivated automatically each
time the ignition is switched back on or from
30 mph (50 km/h).
Below 30 mph (50 km/h), you can reactivate
them manually:
F Press this button again.
The indicator lamp in the button
goes off.
Operating fault
Illumination of this warning lamp and
the lamp in the deactivation button,
accompanied by an audible signal
and a message, indicate a fault with
the system.
Contact a CITROËN dealer or a qualified
workshop to have the system checked.