CITROEN DS3 Owner's Handbook Manual page 150

Deactivation
In exceptional conditions (starting a vehicle
which is bogged down, stuck in snow, on soft
ground...), it may be advisable to deactivate the
ASR and ESP systems, so that the wheels can
move freely and regain grip.
Press the "ESP OFF" button, located on
the left below the steering wheel.
If this warning lamp comes on in the
instrument panel and the indicator
lamp in the button comes on, this
indicates that the ASR and ESP
systems are deactivated.
Reactivation
These systems are reactivated automatically
each time the ignition is switched back on or
from 30 mph (50 km/h) (except 1.6 litre
THP 150 and RACING petrol engines).
Press the "ESP OFF" button again to
reactivate them manually.
Operating fault
If this warning lamp comes on,
accompanied by an audible signal and a
message in the multifunction screen, this
indicates a malfunction of these systems.
Have it checked by a CITROËN dealer or a
qualified workshop.
The ESP/ASR systems offer
exceptional safety in normal driving, but
this should not encourage the driver to
take extra risks or drive at high speed.
The correct functioning of these
systems depends on observation of the
manufacturer's recommendations on:
- wheels (tyres and rims),
- braking components,
- electronic components,
- assembly and repair procedures.
After an impact, have these systems
checked by a CITROËN dealer or a
qualified workshop.