Driving -> Lane departure / Blind spot monitoring for Your DS 4 4 Door Second Generation (2021-2026)

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Driving  
Lane departure warning system  
System which detects the involuntary crossing  
of longitudinal traffic lane markings on the  
ground (solid or broken line).  
No warning is transmitted while the direction  
indicator is active and for approximately  
20 seconds after the direction indicator is  
switched off.  
Sensors, fitted below the front bumper, trigger  
a warning if the vehicle drifts over a lane  
marking (speed higher than 50 mph (80 km/h)).  
This system is particularly useful on motorways  
A warning may be transmitted if a direction  
marking (e.g. arrow) or non-standard marking  
(e.g. graffiti) is crossed.  
Activation  
F
and main roads.  
When switching the ignition on or with  
the engine running, press this button; the  
indicator lamp comes on.  
The lane departure warning system  
cannot in any circumstances replace  
the need for vigilance on the part of the  
driver.  
It is necessary to observe driving  
regulations and take a break every  
two hours.  
Operating fault  
In the event of a malfunction, the  
service warning lamp comes on,  
accompanied by an audible signal  
and a message in the screen.  
Deactivation  
F
Press this button again, the indicator lamp  
goes off.  
The status of the system remains in the  
memory when the ignition is switched off.  
Contact a CITROËN dealer or a qualified  
workshop.  
The detection may be impeded:  
Detection  
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if the sensors are dirty (mud, snow...),  
if the markings on the ground are  
worn,  
You are warned by the vibration of the driver's  
seat cushion:  
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on the right-hand side, if the marking on  
the ground has been crossed on the right,  
on the left-hand side, if the marking on the  
ground has been crossed on the left.  
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if there is little contrast between  
the markings on the ground and  
the road surface.  
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Driving  
Blind spot monitoring system  
Operation  
This driving assistance system warns the driver  
of the presence of another vehicle in the blind  
spot angle of their vehicle (areas masked from  
the driver's field of vision), as soon as this  
presents a potential danger.  
A warning lamp appears in the door mirror on  
the side in question:  
F
On switching on the ignition, or engine  
running, press this button to activate the  
function; the warning lamp comes on.  
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immediately, when being overtaken,  
after a delay of about one second, when  
overtaking a vehicle slowly.  
Sensors fitted in the front and rear bumpers  
monitor the blind spots.  
This system is designed to improve safety when driving and is in no circumstances a  
substitute for the use of the interior rear view mirror and door mirrors. It is the driver's  
responsibility to constantly check the traffic, to assess the distances and relative speeds of  
other vehicles and to predict their movements before deciding whether to change lane.  
The blind spot sensor system can never replace the need for vigilance on the part of  
the driver.  
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Driving  
The alert is given by a warning lamp which  
comes on in the door mirror on the side in  
question as soon as a vehicle - car, lorry,  
cycle - is detected.  
For this, the following conditions must be met:  
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all the vehicles must be moving in the  
same direction,  
the speed of your vehicle is between 7 and  
75 mph (12 and 140 km/h),  
when you overtake a vehicle with a speed  
difference of less than 6 mph (10 km/h),  
when a vehicle overtakes you with a speed  
difference of less than 15 mph (25 km/h),  
the traffic must be flowing normally,  
in the case of an overtaking manoeuvre,  
if this is prolonged and the vehicle being  
overtaken remains in the blind spot,  
you are driving on a straight or slightly  
curved road,  
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No alert will be given in the following situations:  
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when overtaking (or being overtaken by) a  
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in the presence of immobile objects  
(parked vehicles, barriers, street lamps,  
road signs...),  
with vehicles moving in the opposite  
direction,  
very long vehicle (lorry, coach...) which is  
at the same time detected at the rear in the  
blind spot angle and present in the driver's  
forward field of vision,  
in very heavy traffic: vehicles detected in  
front and behind are confused with a lorry  
or a stationary object,  
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your vehicle is not pulling a trailer,  
a caravan...  
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driving on a sinuous road or a sharp  
corner,  
when overtaking quickly.  
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Driving  
Operating fault  
In the event of a fault, the warning lamp in the  
button flashes then goes off.  
Have it checked by a CITROËN dealer or a  
qualified workshop.  
The system may suffer temporary  
interference in certain weather  
conditions (rain, hail...).  
In particular, driving on a wet surface  
or moving from a dry area to a wet area  
can cause false alerts (for example, the  
presence of a fog of water droplets in  
the blind spot angle is interpreted as a  
vehicle).  
In bad or wintry weather, ensure that  
the sensors are not covered by mud,  
ice or snow.  
Take care not to cover the warning  
zone in the door mirrors or the  
detection zones on the front and rear  
bumpers with adhesive labels or other  
objects; they may hamper the correct  
operation of the system.  
F
To deactivate the system, press this button  
again; the warning lamp goes off.  
The state of the system remains in memory on  
switching off the ignition.  
The system is automatically  
deactivated when towing with a towbar  
approved by CITROËN.