2023 CITROEN C4 engine

108
Driving
The vehicle stalls in STOP mode
All of the instrument panel warning lamps come
on if there is a fault.
►
Switch off the ignition then start the engine
again with the key or the " ST

ART/STOP" button.
12 V battery
The Stop & Start system requires a
12 V battery of specific technology and
specification.
All work must be carried out only by a
CITROËN dealer or a qualified workshop
Tyre under-inflation detection
This system alerts the driver if one or more tyres
suffer a drop in pressure.
The alert is raised when the vehicle is moving,
not when stationary.
It compares the information given by the wheel
speed sensors with reference values, which
must be reinitialised every time the tyre
pressures are adjusted or a wheel changed.
It takes into account the last values stored
during the reinitialisation request. It is therefore
essential that the tyre pressure is correct during
the operation. This operation is the driver’s
responsibility.
The tyre under-inflation detection cannot, in any circumstances, replace the need
for vigilance on the part of the driver.
This system does not avoid the need to
regularly check the tyre pressures (including
the spare wheel), especially before a long
journey.
Driving with under-inflated tyres, particularly
in adverse conditions (heavy load, high
speed, long journey):
–

worsens road-holding.
–


lengthens braking distances.
–


causes premature wear of the tyres.
–


increases energy consumption.
The inflation pressures defined for the vehicle can be found on the tyre pressure
label.
For more information on the Identification
markings, refer to the corresponding section.
Checking tyre pressures
This check should be done monthly
when the tyres are "cold" (vehicle stopped for
1 hour or after a journey of less than 6 miles
(10

km) at moderate speeds).
Otherwise, add 0.3 bar to the pressures
shown on the label.
Snow chains
The system does not have to be
reinitialised after fitting or removing snow
chains.
Under-inflation alert
This is signalled by the fixed illumination of this warning lamp, accompanied by an
audible signal and, depending on equipment, the
display of a message.
►

Reduce speed immediately
, avoid excessive
steering movements and avoid sudden braking.
►

Stop the vehicle as soon as it is safe to do
so.
The loss of pressure detected may not always cause visible deformation of the
tyre.
Do not rely on just a visual check.
►

Using a compressor
, such as the one in
the temporary puncture repair kit, check the
pressures of all four tyres when cold.
►

If it is not possible to carry out this check
immediately

, drive carefully at reduced speed.
►

In the event of a puncture, use the
temporary puncture repair kit or the spare wheel
(depending on equipment).
Driving too slowly may not ensure
optimum monitoring.
The alert is not immediately triggered in the
event of a sudden loss of pressure or tyre

11 3
Driving
6instrument panel must match that of the
country you are driving in.
Automatic sign reading is a driving aid system and does not always display the
correct speed limits.
The speed limit signs present on the road
always take priority over those displayed by
the system.
The system is designed to detect signs that
conform to the Vienna Convention on road
signs.
Specific speed limits, such as those for
heavy goods vehicles, are not displayed.
The display of the speed limit on the
instrument panel is updated when passing
a speed limit sign intended for cars (light
vehicles).
Activation/Deactivation
By default, the system is automatically activated
at every engine start.
With Touch screen BLUETOOTH audio
system or MyCitroën Play
The settings are changed via the Driving
touch screen menu.
With MyCitroën Drive
The settings are changed via the Vehicle
touch screen menu.
With MyCitroën Drive Plus
The settings are changed via the ADAS
touch screen application.
Information displayed on
the instrument panel


1. Detected speed limit indication
or
2. End of speed limit indication


The system is active but is not detecting speed
limit information.


On detecting speed limit information, the system
displays the value.


For a suggested maximum speed, the first time
that the vehicle exceeds it
by more than 3 mph
(5
km/h) (e.g. 59 mph (95 km/h)), the speed is
displayed and flashes for 10 seconds (depending
on version).
Operating limits
The system does not take account of reduced
speed limits, especially those imposed in the
following cases:
–

Atmospheric pollution.
–

Towing.
–

Driving with a space-saver type spare wheel
or snow chains fitted.
–


T
yre repaired using the temporary puncture
repair kit.
–

Y
oung drivers.
The system may not display the speed limit if it
does not detect a speed limit sign within a preset
period and in the following situations:
–

Road signs that are obstructed, non-standard,
damaged or bent.
–


Obsolete or incorrect maps.
Speed setting
recommendations
The driver can select the speed displayed by the
Road signs recognition system as the speed
setting for the speed limiter, cruise control or
adaptive cruise control using the OK button.
In the event of rain detection, the system offers
the driver a speed setting lower than the speed

11 7
Driving
6Cruise control
For more information, refer to the
General recommendations on the use
of driving and manoeuvring aids and the
Cruise control - particular
recommendations.
This system automatically maintains the vehicle’s speed at the value programmed
by the driver (speed setting), without the use of
the accelerator pedal.
Cruise control is switched on manually.
It requires a minimum vehicle speed of 25 mph
(40

km/h).
With a manual gearbox, third gear or higher must
be engaged.
With an automatic gearbox, mode

D
or second
gear or higher in mode

M
must be engaged.
With a drive selector, mode
D or B must be
engaged.
Cruise control remains active after
changing gear, regardless of the gearbox
type, on engines fitted with the Stop & Start
function.
Switching off the ignition cancels any
speed setting.
Steering-mounted controls



1. Cruise control selection
2. Switch on/pause cruise control at the
previously saved speed setting
3. Increase/Decrease the speed setting (if
cruise control activated)
Activation of cruise control in progress (if
cruise control deactivated)
4. Activation of cruise control in progress
Use the speed suggested by the Road signs
recognition
For more information on the Road signs
recognition


function, refer to the corresponding
section.
Information displayed on
the instrument panel


5. Cruise control mode selection indication
6. Cruise control on (green)/pause (grey)
indication
7. Speed setting value
8. Speed suggested by the Road signs
recognition function (depending on version)
Switching on/pausing
► Press button 1 to select the cruise control
mode; the function is paused (grey).
►

Press
3 upwards/downwards, or press 4-OK
to activate the cruise control and save a speed
setting as soon as the vehicle speed reaches the
desired level (green).
►

Pressing button 2-I I>

temporarily pauses the
function.

120
Driving
Steering-mounted controls



1. Selection/deselection of cruise control only or
Highway Driver Assist (depending on version)
2. Switch on/pause cruise control at the
previously saved speed setting
Confirmation of vehicle restart after automatic
stop (version with Stop & Go function)
3. Increase/Decrease the speed setting (if
cruise control activated)
Activation of cruise control in progress (if
cruise control deactivated)
Display and configuration of the inter-vehicle
distance setting
4. Activation of cruise control in progress
Use the speed suggested by the Road signs
recognition function
For more information on the Road signs
recognition


function, refer to the corresponding
section.
Information displayed on
the instrument panel


5. Cruise control activated (green)/paused
(grey)
6. Speed setting value
7. Speed suggested by the Road signs
recognition function
8. Vehicle held stationary (version with
Stop&Go function)
9. Inter-vehicle distance setting
10. Position of the vehicle detected by the
system
Use
Selecting the system
► With the engine running, press 1-ASSIST to
select cruise control mode.
The symbol for the Adaptive cruise control system is displayed on the instrument
panel.
Switching on cruise control
With an EAT8 automatic gearbox or a drive
selector, your speed must be between 0 and
112
mph (0 and 180 km/h).
System activation is also subject to the following
conditions:
–

driver's door closed.
–


driver's seat belt fastened.
–

mode D selected on the automatic gearbox.
–

parking brake released.
–


if the vehicle is stationary
, brake pedal
depressed.
►

Press
3 or 4-OK: the current speed becomes
the speed setting (minimum 19 mph (30
km/h))
and cruise control is immediately activated
(green display).
Modifying the speed setting
To change the speed setting using the vehicle’s
current speed:
►

For steps of +/- 1 mph (1 km/h), make
successive short presses upwards/downwards
on

3 to increase/decrease.
►

For steps of +/- 5 mph (5
km/h), press and
hold upwards/downwards on 3 to increase/
decrease.
Prolonged pressing and holding
upwards/downwards on 3 causes a rapid
change in vehicle speed.

130
Driving
Function statusDisplayComments
ON



"Hold the steering
wheel" or "Stay in lane" (depending on version) If, while correcting the trajectory, the system determines that the correction will not be
enough and that a solid line will be crossed: the driver is warned that \
they must provide
additional trajectory adjustment.
If the steering wheel is not held properly, an audible warning sounds, accompanied by
a message, until the trajectory correction is completed or the driver ha\
s grasped the
steering wheel correctly.
The duration of audible warnings will increase if multiple corrections a\
re performed
in quick succession. The warning will become continuous, persisting until the driver
responds.
Operating limits
The system goes into standby automatically in
the following cases:
–

ESC deactivated or operation triggered.
–


Speed below 40 mph (65
km/h) or greater
than 112 mph (180
km/h).
–

Electrical connection to a trailer
.
–

Use of a"space-saver" spare wheel detected
(as detection is not immediate, deactivation of
the system is recommended).
–


Dynamic driving style detected, pressure on
the brake or accelerator pedal.
–


Driving over lane markings.
–


Activation
of the direction indicators.
–

Crossing the inside line on a bend.
–


Driving on a tight bend.
–


Inactivity by the driver detected during
correction.
–


Narrow lane detected.
The following situations may interfere with the operation of the system or
prevent it from working:
–

Insufficient contrast between the road
surface and the side of the road (e.g. shade).
–


Lane markings worn, hidden (snow
, mud)
or multiple (roadworks, etc.),
–

Close proximity to the vehicle in front (lane
markings may not be detected).
–


Roads that are narrow
, winding.
Risk of undesirable operation
The system should be deactivated in the
following situations:
–
When changing a wheel or working near a
wheel.
–


T
owing or with a bicycle carrier on a towing
device, especially with trailer not plugged in or
not approved. –

Road in poor condition, unstable or with very
poor grip (risk of aquaplaning, snow
, ice).
–
Adverse weather conditions.
–

Driving on racing circuits.
–

Driving on a rolling road.
Deactivation/Activation
By default, the system is automatically activated
at every engine start.
With the dashboard button

133
Driving
6

This system:
– warns the driver that their vehicle is at risk of
collision with the vehicle in front, a pedestrian or
,
depending on version, a cyclist.
–

reduces the vehicle's speed to avoid a
collision or limit its severity

.
The speed will be reduced by a maximum of 12 mph (20 km/h) (versions
with camera only) or by a maximum of 31
mph (50
km/h) (versions with camera and
radar).
The system also takes motorcyclists into account.
This system is comprised of three functions:
–

Collision
Risk Alert.
–

Intelligent emergency braking assistance
(iEBA).
–


Active Safety Brake (automatic emergency
braking).


The vehicle has a multifunction camera located
at the top of the windscreen and, depending on
version, a radar located in the front bumper.
This system does not replace the need for driver vigilance.
This system is designed to assist the driver
and improve road safety.
It is the driver's responsibility to continuously
monitor traffic conditions in accordance with
applicable driving regulations.
As soon as the system detects a potential collision, it prepares the braking
circuit. This may cause a slight noise and a
slight sensation of deceleration.
Deactivation/Activation
By default, the system is automatically activated
at every engine start.
With Touch screen BLUETOOTH audio
system or MyCitroën Play
The settings are changed via the Driving
touch screen menu.
With MyCitroën Drive
The settings are changed via the Vehicle
touch screen menu.
With MyCitroën Drive Plus
The settings are changed via the ADAS
touch screen application.
Deactivation of the system is signalled by
the illumination of this warning lamp,
accompanied by the display of a message.
Operating conditions and
limits
Vehicle moving forward without trailer.
Brake system operational.
Seat belts fastened for all passengers.
Stabilised speed on roads with no or low
curvature.
This warning lamp lights up on the instrument panel without any additional
message, to indicate that the automatic braking
system is not available.
This is a normal behavior indicating that a
condition is not fulfilled and which does not
request the support of a workshop.
In any situations with ignition on where automatic
braking presents a risk, deactivating the system
is recommended, for instance:

134
Driving
– Towing a trailer (particularly a trailer without its
own braking system).
–
Carrying long objects on roof bars.
–


Driving with snow chains.
–


Using an automatic car wash.
–


Performing any maintenance (e.g.
changing a
wheel, working inside the engine compartment).
–

Placing the vehicle on a rolling bench in a
workshop.
–


T
owing the vehicle.
–

Following a damage of the windscreen close
to the detection camera.
The system is automatically deactivated when the use of certain types of
"space-saver" spare wheel (smaller diameter)
is detected, or if a fault with the brake pedal
switch or at least two brake lamps is detected.
Following a severe crash (e.g.
with airbag
deployment), the system is automatically
deactivated.
Have it checked by a CITROËN dealer or a
qualified workshop.
In case the detection is degraded or
temporarily unavailable by environment
conditions, then a driver indication is not
displayed (because a driver action is not
requested).
It can be dangerous to drive if the brake
lamps are not in perfect working order.
The driver must not overload the vehicle (keep within the GVW limit and load
height limits for roof bars).
Collision Risk Alert
This function warns the driver if there is a risk
of collision with the preceding vehicle, or with a
pedestrian or cyclist.
Modifying the alert trigger threshold
The trigger threshold determines the sensitivity
with which the function warns of the risk of
collision.
The selected threshold is memorised when the
ignition is switched off.
With Touch screen BLUETOOTH audio
system or MyCitroën Play
The threshold is set via the Driving touch screen menu.
►

Select one of the three pre-defined
thresholds: "

Far", "Normal" or "Close".
With MyCitroën Drive
The threshold is set via the Vehicle touch screen menu.
►

Select one of the three pre-defined
thresholds: "

Far", "Normal" or "Close".
With MyCitroën Drive Plus
The threshold is set via the ADAS touch screen application.
► Select one of the 3 preset thresholds: " Far ",
"Medium" or "Near".
Operation
Depending on the collision risk detected by the
system and the alert trigger threshold chosen
by the driver, different levels of alert may be
triggered and displayed on the instrument panel.
The system takes into account the vehicle
dynamics, the difference speed of the own
vehicle and the object identified for the
collision risk, and the operation of the vehicle
(e.g.
actions on the pedals, steering wheel) to
trigger the alert at the most relevant moment.
(orange)
Level 1: visual alert only, warning that the
preceding vehicle is very close.
The message "Vehicle close" is displayed.
(red)
Level 2: visual and audible alert, warning
that a collision is imminent.
The message "Brake! " is displayed.
Level 3: a micro-braking may be given,
confirming the risk of collision (optional).
While approaching a vehicle too quickly,
the level 2 alert may be displayed
directly.
Important: the level 1 alert depends on the
trigger threshold selected. It reacts only on
moving vehicles. It is disabled automatically
at lower speed.

135
Driving
6It is possible that collision warnings are
not given, are given too late or seem
unjustified.
The driver must always stay in control of the
vehicle and be prepared to react at any time
to avoid an accident.
If you select "Far" in the touch screen,
then the system warns sooner. This
increases the safety but increases also the
amount of alerts, if the legal safety distance is
not kept.
To reduce the alert occurrence, you can
change the setting to either of the other two.
Intelligent emergency
braking assistance (iEBA)
This function increases vehicle deceleration
if the driver does not brake enough to avoid a
collision.
This assistance is only provided if the driver
presses the brake pedal.
Active Safety Brake

This function, also called "automatic emergency
braking", intervenes after the acoustic alert if the
driver does not operate the brake pedal quickly
enough.
The system aims at reducing the speed of
impact or avoiding a collision if the driver fails to
react.
The speed will be reduced by a maximum of 12 mph (20 km/h) (versions
with camera only) or by a maximum of 31
mph (50
km/h) (versions with camera and
radar).
Operation
The system operates in the following speed
ranges:
–

Between 3 mph and 50 mph (5
km/h and
80
km/h) when a stationary vehicle is detected.
–

Between 3 mph and 50 mph (5
km/h and
80
km/h) when a pedestrian is detected.
–

Between 3 mph and 50 mph (5
km/h and
80
km/h) when a cyclist is detected (versions
with camera and radar only).
–

Between 3 mph and 50 mph (5
km/h and
80
km/h) (versions with camera only) or 87 mph
(140
km/h) (versions with cameras and radar)
when a moving vehicle is detected.
This warning lamp flashes (for approximately 10 seconds) as soon as
the function applies the vehicle’s brakes.
During the flashing time, the function is not
available.
With an automatic gearbox or drive selector, in
the event of automatic emergency braking, keep
the brake pedal depressed, also after a complete
stop is reached, to prevent the vehicle from
rolling away.
With a manual gearbox, in the event of automatic
emergency braking bringing the vehicle to a
complete stop, the engine may stall.
The driver can override the automatic emergency braking at any time by
strongly turning the steering wheel (evasive
manoeuver) and/or by firmly pressing the
accelerator pedal.