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The alert is maintained until the system is r einitialised.
The loss of pressure detected does not
always
cause
visible
bulging
of
the
tyre.
D
o
not
satisfy
yourself
with
just
a
visual
c
heck. Before
reinitialising the system, ensure
t
hat the pressures of the four tyres are
correct for the use of the vehicle and in
line
with the recommendations on the
t
yre pressure label.
The
under-inflation detection system
d
oes not give a warning if a pressure is
i
ncorrect at the time of reinitialisation.
Under-inflation alert
This is given by fixed illumination of this warning lamp, accompanied by
a
n audible signal and the display of a
m
essage.
F
R
educe speed immediately, avoid
e
xcessive steering movements and sudden
b
raking
F
S
top
the vehicle as soon as it is safe to do so.F
I f you have a compressor (such as the one
i
n the temporary puncture repair kit) check
t
he pressures of the four tyres when cold.
I
f it is not possible to carry out this check
s
traight away, drive carefully at reduced
s
peed.
or
F
I
n the event of a puncture, use the
temporary
puncture repair kit or the spare
w
heel (depending on equipment),
Reinitialisation
It is necessary to reinitialise the system every time one or more tyre pressure is adjusted, and
a
fter changing one or more wheels.
A
label attached to the middle pillar, left hand
s
ide, gives a reminder of this.
Safety
Page 154 of 404

Reinitialisation of the system must be done with the ignition on a nd the vehicle stationary,
in the vehicle configuration menu.
Monochrome screen A
F Press the MENU button for access to the
main menu.
F
P
ress the " 5" or " 6" button to select
the
menu Veh conf ig,
then confirm by
p
ressing the OK
button.
F
P
ress the " 5" or " 6" button to select the
" Reinit inflat ",
menu, then confirm by
p
ressing the OK
button.
A
message is displayed to confirm the
in
struction.
F
C
onfirm by pressing the OK
button.
Monochrome screen c
F Press the MENU button for access to the
main menu.
F
P
ress the " 5" or " 6" button to
select
the menu, "Personalisation-
configuration "then
confirm by pressing
t
he OK
button.
F
P
ress the " 5" or " 6" button to select the
"
def
ine vehicle parameters "
menu, then
c
onfirm by pressing the OK
button.F
P ress the "
5" or " 6" button to select
the " Tyre pressures "
menu, then the
"R
einitialisation"
menu, then confirming
b
y pressing the OK
button.
A
message confirms the reinitialisation.
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DS3_en_Chap08_securite_ed01-2014
colour screen
F Press the "SETUP" button for access to
the configuration menu.
F
Sel
ect the " Vehicle parameters "
menu,
t
hen confirm.
F
Sel
ect "
dr
iving assistance ",
then confirm.
F
Sel
ect "Initialisation of under-inflation ",
then
confirm.
A
message is displayed to confirm the
r
einitialisation
i
nstruction.
F
Sel
ect "Ye s" or " No",
then confirm.
A
message confirms the reinitialisation.The
new pressure settings registered are
c
onsidered to be reference values by the
system.
Snow chains
The system does not have to be r einitialised after fitting or removing
sn
ow
c
hains. Before
doing anything to the system,
t
he pressures of the four tyres must be
c
hecked and the system reinitialised.
The under-inflation alert is only
dependable if the system has been
r
einitialised with all four tyres inflated to
the correct pressures.
Operating fault
The flashing and then fixed illumination of the u
nder-inflation w arning lam p a ccompanied b
y illumination of the Service warning lamp
i
ndicates a fault with the system.
In
this case, under-inflation monitoring of the
t
yres is no longer assured.
Have
the system checked by a CITROËN
d
ealer or a qualified workshop.
Safety
Page 156 of 404

Braking assistance systems
Group of supplementary systems which help you to obtain optimum braking in complete
s
afety in emergency situations:
-
a
nti-lock braking system (ABS),
-
e
lectronic brake force distribution (EBFD),
-
e
mergency braking assistance (EBA).Anti-lock braking system
and electronic brake force
distribution
Linked systems which improve the stability and manoeuvrability of your vehicle when braking,
i
n particular on poor or slippery sur faces.
Activation
The anti-lock braking system comes into operation automatically when there is a risk of
w
heel lock.
Normal
operation of the ABS may make itself
f
elt by slight vibration of the brake pedal.
When
braking in an emergency, press
v
ery firmly without releasing the
p
ressure.
Operating fault
If this warning lamp comes on, together with the STOP and ABS
warning
lamps, accompanied by an
a
udible
signal and a message in the screen, it
i
ndicates
a malfunction of the electronic brake
f
orce distribution which could result in loss of
control
of
the vehicle when braking.
You must stop as soon as it is safe to do so.
When
replacing wheels (tyres and
r
ims), ensure that they conform to the
ma
nufacturer's
r
ecommendations.
If
this warning lamp comes on,
a
ccompanied by an audible signal
a
nd a message in the screen, it
i
ndicates
a malfunction of the anti-lock braking
s
ystem
which could result in loss of control of
t
he
vehicle when braking.
In either case, contact a CITR
oË
N dealer or a
qualified
w
orkshop.
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Emergency braking assistance
System which, in an emergency, enables you to obtain the optimum braking pressure more
q
uickly, thus reducing the stopping distance.
Activation
It is triggered by the speed at which the brake pedal is pressed.
The effect of this is a reduction in the
resistance of the pedal and an increase in
braking
e
fficiency.
When
braking in an emergency, press
f
irmly without releasing the pressure.
Trajectory control systems
Anti-slip regulation (ASR)
and electronic stability
programme (ESP)
The anti-slip regulation (also known as Traction Control) optimises traction to prevent skidding
o
f the wheels, by acting on the brakes of the
d
riving wheels and on the engine.
The
electronic stability programme acts on the
b
rake of one or more wheels and on the engine
t
o keep the vehicle on the trajectory required
b
y the driver, within the limits of the laws of
p
hysics.Activation
These systems are activated automatically each time the vehicle is started.
They
come into operation in the event of a grip
o
r
t
rajectory
pro
blem.
This
is indicated by flashing of this
w
arning lamp in the instrument panel.
Safety
Page 158 of 404

deactivation
In exceptional conditions (starting a vehicle which is bogged down, stuck in snow, on soft
g
round...), it may be advisable to deactivate the
A
SR and ESP systems, so that the wheels can
m
ove freely and regain grip.
F
P
ress the "ESP OFF" button, located on
the
left below the steering wheel.
Illumination
of the lamp in the button indicates
t
hat
t
he
A
SR
a
nd
ES
P
s
ystems
a
re
d
eactivated.
Reactivation
These systems are reactivated automatically each time the ignition is switched back on or
f
rom 30 mph (50 km/h) except 1.6 litre
(THP 150, THP 155 and THP 160) and
R ACING
petrol engines.
F
P
ress the "ESP OFF" button again to
r
eactivate
t
hem
ma
nually.
Operating fault
The ESP/ASR systems offer exceptional s afety i n n ormal d riving, b ut
t
his should not encourage the driver to
t
ake extra risks or drive at high speed.
The
correct functioning of these
s
ystems depends on observation of the
ma
nufacturer's
r
ecommendations
o
n:
-
w
heels (tyres and rims),
-
b
raking components,
-
el
ectronic
c
omponents,
-
a
ssembly and repair procedures.
After
an impact, have these systems
c
hecked by a CITROËN dealer or a
q
ualified
w
orkshop.
Illumination
of this warning lamp in
t
he instrument panel and the lamp in
t
he "ESP OFF" button, accompanied
b
y an audible signal and a message
i
n
the
multifunction screen, this indicates a
m
alfunction of these systems.
Have
it checked by a CITROËN dealer or a
q
ualified
w
orkshop.
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DS3_en_Chap08_securite_ed01-2014
Active City Brake
Active City Brakeis a driving assistance system that aims to avoid a frontal collision or reduce
t
he speed of an impact if the driver does
n
ot take sufficient action (inadequate brake
a
pplication).
This system is designed to improve driving safety.
I t remains the driver's responsibility to c
ontinuously monitor the state of the traffic and
t
o assess the distances and relative speeds of
other
v
ehicle.
Active City Brakecan in no circumstances replace the need for vigilance on the part of t
he
d
river.
never look at the laser sensor through an optical in strument ( magnifying g lass, m
icroscope...) at a distance of less than
1
0 centimetres: risk of eye injury.Automatic
braking occurs later than if
d
one by the driver, so as to intervene
only
when there is a high risk of
c
ollision.
Principle
Using a laser sensor located at the top of the windscreen, this system detects a vehicle
r
unning in the same direction or stationary
a
head of your vehicle.
When
necessary, the vehicle's braking system
i
s operated automatically to avoid a collision
w
ith the vehicle ahead.
conditions for activation
Active City Brakeonly operates if the following conditions are met:
●
i
gnition on,
●
t
he vehicle is in a for ward gear,
●
s
peed is between about 3 and 18 mph
(
5 and 30 km/h),
●
t
he braking assistance systems (ABS,
E
BFD, emergency braking assistance) are
n
ot faulty,
●
t
he trajectory control systems (ASR, DSC)
a
re not deactivated or faulty,
●
t
he vehicle is not in a tight corner,
●
t
he system has not been triggered during
t
he previous 10 seconds.
Safety
Page 160 of 404

Operation
When your vehicle is too close to or
approaches the vehicle ahead too quickly the
s
ystem automatically applies the brakes to
a
void a collision. The
collision can be avoided automatically if the d
ifference in speed between your vehicle and the
vehicle
ahead does not exceed 9 mph (15 km/h).
Above
this threshold, the system will do what
i
s possible to avoid or reduce the accident by
lowering
the speed of impact.
The
automatic braking may bring the vehicle to
a
complete stop if the situation requires it.
In this case, the vehicle is held stationary
temporarily
(for about 1.5 seconds) to allow
t
he driver to take back control by pressing the
b
rake
ped
al.
You are then alerted by the display of a
message.
The
brake lamps on your vehicle come on to
w
arn other road users.
After
an impact, the system is
a
utomatically put out of service: it no
lon
ger
ope
rates.
You
must go to a CITROËN dealer or a
q
ualified workshop to have the system
m
ade operational again.
During
automatic braking, the driver
c
an always obtain a higher rate of
d
eceleration than that controlled by the
system,
by pressing firmly on the brake
ped
al.
The
triggering of the system may cause
t
he engine to stall, unless the driver
d
epresses the clutch pedal quickly
e
nough during automatic braking.