2015 Citroen C1 ECU

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Reinitialisation of the system is done with the
ignition on (ignition switch in the " ON" position
or " ON" mode) and the vehicle stationary.
F

O
pen the glove box.
F

P
ress the reinitialisation button.
The new pressure settings registered
are considered to be reference values by
the
system. F

T
his warning lamp flashes
3
times in the instrument panel
when the reinitialisation is done.
F

W
ait a few minutes before switching off
the ignition (ignition switch in the " ACC" or
" LOCK " position, or " OFF" mode).
Operating fault
The flashing and then fixed illumination
of the under-inflation warning lamp
indicates a fault with the system.
In this case, under-inflation monitoring of the
tyres is no longer assured.
Have the system checked by a CITROËN
dealer or a qualified workshop.
Before doing anything to the system,
the pressures of the four tyres must be
checked and the system reinitialised.
The under-inflation alert can only be
considered reliable if reinitialisation of
the system is done with the the four tyre
pressures correctly set.Snow chains
The system does not have to be
reinitialised after fitting or removing
snow chains.
Safety

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Electronic Stability Control (ESC) incorporating
the following systems:
-
a
nti-lock braking system (ABS) and the
electronic brake force distribution (EBFD),
-
em

ergency braking assistance,
-

t
raction control (TRC),
-

d
ynamic stability control (DSC).
Electronic stability control (ESC)
Definitions
Anti-lock braking system (ABS)
and electronic brake force
distribution (EBFD)
These systems improve the stability and
manoeuvrability of your vehicle when braking
and contribute towards better control in
corners, in particular on poor or slippery road
surfaces.
The ABS prevents wheel lock in the event of
emergency braking.
The electronic brake force distribution system
manages the braking pressure wheel by wheel.
Emergency braking assistance
In an emergency, this system enables you to
reach the optimum braking pressure more
quickly and therefore reduce the stopping
distance.
It is triggered according to the speed at which
the brake pedal is pressed. This is felt by a
reduction in the resistance of the pedal and an
increase in the effectiveness of the braking.
Traction control (TRC)
This system optimises traction in order to limit
wheel slip by acting on the brakes of the driving
wheels and on the engine. It also improves
the directional stability of the vehicle on
acceleration.
Dynamic stability control (DSC)
If there is a difference between the path
followed by the vehicle and that required by the
driver, this system monitors each wheel and
automatically acts on the brake of one or more
wheels and on the engine to return the vehicle
to the required path, within the limits of the laws
of physics.
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Safety

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Illumination of this warning lamp,
accompanied by an audible signal,
indicates that there is a fault with the
electronic brake force distribution
(EBFD), which could cause loss of
control of the vehicle when braking.
Operation
Illumination of this warning lamp,
accompanied by an audible signal,
indicates that there is a fault with
the ABS system, which could cause
loss of control of the vehicle when
braking.
Anti-lock braking system (ABS)
and electronic brake force
distribution (EBFD)When changing wheels (tyres and rims),
make sure that these are approved for
your vehicle.
Normal operation of the ABS may make
itself felt by slight vibration of the brake
pedal.
In emergency braking, press
very firmly without releasing
the

pressure.
Yo u must stop as soon as it is safe to do so.
Contact a CITROËN dealer or a qualified
workshop as soon as possible.
Dynamic stability control (DSC)
and traction control (TRC)
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.
Activation of the DSC system is
signalled by the flashing of this
indicator lamp in the instrument panel,
accompanied by an audible signal.
Activation of the TRC system is
signalled by the flashing of this
indicator lamp in the instrument panel.
Drive carefully at reduced speed, and contact a
CITROËN dealer or a qualified workshop.
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The TRC and DSC systems offer
increased safety in normal driving, but
should not encourage the driver to take
extra risks or drive at high speed.
The correct operation of these
systems depends on observation of
the manufacturer's recommendations
regarding the wheels (tyres and rims),
the braking components, the electronic
components and the assembly and
repair procedures used by CITROËN
dealers.
After an impact, have the system
checked by a CITROËN dealer or a
qualified workshop.
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 TRC systems, so that the wheels can
spin freely and regain grip.
Operating fault
However, it is recommended that theses
systems be reactivated as soon as possible.F

P
ress this button briefly.
This warning lamp comes on: the
TRC system no longer acts on the
operation of the engine.
Reactivation
The TRC and DSC control systems are
reactivated automatically every time the engine
is started. F

P
ress the button again to
reactivate it manually. Illumination of this warning lamp,
accompanied by an audible signal,
indicates a fault with the system.
Drive carefully at reduced speed and contact
a CITROËN dealer or a qualified workshop to
have the system checked.
Deactivation of the TRC system only
Deactivation of the TRC and DSC systems F

V

ehicle stationary , press this
button for at least than 3 seconds.
These warning lamps come
on: the TRC and DSC
systems no longer act on
the operation of the engine. When the TRC system only is deactivated, it is
reactivated as the vehicle's speed increases.
When both the TRC and DSC systems are
deactivated, they do not reactivate themselves
even if the speed of the vehicle increases.
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Safety

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Active City Brake
Active City Brake is a driving assistance system that aims to avoid a frontal collision or reduce the speed of an impact if the driver does not react or
reacts too late (brake application too late).This system is designed to improve
driving safety.
It remains the driver's responsibility to
continuously monitor the state of the
traffic and to assess the distances and
relative speeds of other vehicles.
Active City Brake can in no
circumstances replace the need for
vigilance on the part of the driver.
Never look at the laser sensor through
an optical instrument (magnifying glass,
microscope...) at a distance of less than
10 centimetres: risk of eye injury.
Automatic braking occurs later than if
done by the driver, so as to intervene
only when there is a high risk of
collision.
Principle
Using a laser sensor and a camera located at
the top of the windscreen, this system detects
a vehicle running in the same direction or
stationary ahead of your vehicle.
When necessary, the vehicle's braking system
is operated automatically to reduce the speed
of impact or to help avoid a collision with the
vehicle ahead.
Conditions for activation
Active City Brake only operates if the following
conditions are met:
●
t
he engine is running,
●

t
he vehicle is in a for ward gear,
●

t
he speed is between 9 and 87 mph
(15
and 140 km/h) for triggering the alert ;
the difference in speed between your
vehicle and the one ahead is more than
about 9
mph (15 km/h),
●

t
he speed is between about 18 and 50 mph
(30 and 80 km/h) for braking assistance ;
the difference in speed between your
vehicle and the one ahead is more than
about 18 mph (30 km/h),
●

t
he speed is between about 6 and 50 mph
(10 and 80 km/h) for automatic braking ;
the difference in speed between your
vehicle and the one ahead is more than
about 6 mph (10 km/h),
●

t
he braking assistance systems (ABS,
EBFD, EBA) are not faulty,
●

t
he trajectory control systems (TRC, DSC)
are not deactivated or faulty,
●

t
he vehicle is not in a tight corner,
●

t
he system has not been triggered during
the previous 10 seconds.
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Activation
Press the button, this warning lamp
comes on in the instrument panel.
Operation
Three levels of operation are possible:
● A lert: if a risk of collision with a vehicle is
detected, a warning lamp comes on in the
instrument panel together with an audible
signal. The thresholds for triggering the
alert can be set.
●

Br
aking assistance : increases the
braking started by the driver, only if a risk
of collision is detected.
●

A
utomatic braking : when your vehicle
is too close to or closing too quickly on
the vehicle ahead of you, the system
automatically operates the brakes to
reduce the speed of impact. A collision can
be avoided automatically if the difference
in speed between your vehicle and the one
ahead is not more than 18 mph (30 km/h).
You are then alerted by the display of
this warning lamp, accompanied by
an audible signal. The automatic braking may bring the vehicle to
a complete stop if the situation requires it.
The brake lamps on your vehicle come on to
warn other road users. The triggering of the system may cause
the engine to stall, unless the driver
depresses the clutch pedal quickly
enough during automatic braking.
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Safety

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Setting the alert thresholds
Press this button repeatedly to cycle
through the thresholds.
The default setting is "Normal".
The alert thresholds determine how you want to be warned of the imminent risk of collision with the
vehicle ahead of you.
You can choose one of three thresholds:
-

"

Far", to be given early warning (cautious driving).
-
"

Normal".
-

"

Close", for a later warning (sporty driving).
Deactivation
Press the button again, this indicator
comes on in the instrument panel.
The state of the system is memorised when the
ignition is switched off.
Safety

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Unwanted triggering of the system
It is possible for the system to detect a risk of
imminent collision and start working, in the
following conditions in particular:
-
d
etection of an object located close to the
outer edge of a bend (safety barrier, lamp
post or road sign),
-

d
etection of an object located at the top or
bottom of a steep slope,
-

d
etection of reflective objects (central
reservation...) in the road,
-

d
etection of the upper bar of a bridge or a
traffic light gantry,
-

d
etection of a vehicle on a bend travelling
in the other direction,
-

d
etection of a vehicle traveling in the other
direction, at a crossroads, when your
vehicle is turning left or right,
-

i
f the vehicle ahead of you sends up water
or snow,
-

i
f your vehicle stops very close to a wall or
other vehicles,
-

w
hen your vehicle closes rapidly on the
vehicle ahead,
-

i
f the vehicle is raised or lowered,
-
i

f the vehicle passes through a plastic curtain,
-

i
f driving through mist or smoke,
-

i
f the sensor is misaligned (following
replacement after a collision).
Never leave accumulations of snow or
any object projecting above the bonnet
or in front of the roof: this might fall into
the field of vision of the sensor and
generate a detection.
Operating limits
The system only detects
vehicles (cars, lorries)
that are stationary or moving in the same
direction as your vehicle. In difficult weather conditions (very
heavy rain, snow, fog, hail...), braking
distances increase, which can reduce
the ability of the system to avoid a
collision.
The driver must therefore remain
particularly vigilant.
The system is not triggered or is interrupted if
the driver:
-

a
ccelerates strongly (even if the speed
limiter is on),
-

o
r turns the steering wheel suddenly
(avoiding manoeuvre).
Detection capability is less effective if:
-

y
ou are driving on roads with pronounced
bends and/or on roads in poor condition,
-

y
our vehicle is excessively loaded, as
this changes the horizontal attitude of the
vehicle. It does not detect small vehicles
(bicycles, motorcycles), pedestrians or
animals, nor non-reflective stationary
objects.
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Safety