B Button CITROEN C4 2023 User Guide
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Electronic key with 
remote control function 
and built-in key
Remote control function 
 
The remote control can be used to perform 
the following remote functions (depending on 
version):
– 
Unlocking/Locking/Deadlocking the vehicle.
–
 
Unlocking and partial opening of the boot.
–
 
Remote operation of lighting.
–
 
Folding/Unfolding the door mirrors.
–
 
Activating/Deactivating the alarm.
–
 
Locating the vehicle.
–
 
Opening/Closing the windows.
–
 
Closing the sunroof.
–
 
Activating the vehicle’
 s electronic immobiliser.
Back-up procedures allow the vehicle to be 
locked/unlocked in the event of a failure of the 
remote control, the central locking, the battery, 
etc. For more information on the Back-up 
procedures, refer to the corresponding section.
Built-in key
The key built into the remote control can be 
used for the following operations, depending on 
version:
–
 
Locking/Unlocking the vehicle.
–
 
Activation/Deactivation of the manual child 
lock.
–
 
Activation/Deactivation of the front passenger 
airbag.
–
 
Back-up Unlocking/Locking of the doors.
–
 
Switching on the ignition and starting/switching 
off the engine.
W
ithout Keyless Entry and Start
 
 
â–º To unfold or fold the key, press the button.
With Keyless Entry and Start
 
 
â–º To eject the key or put it back in place, pull 
and hold the button.
Once the built-in key is ejected, always 
keep it with you to be able to carry out 
the corresponding back-up procedures.
Unlocking the vehicle  
With Touch screen BLUETOOTH audio 
system or MyCitroën Play
Selective unlocking is configured in the 
Driving touch screen menu.
With MyCitroën Drive
Selective unlocking is configured in the 
Vehicle touch screen menu.
With MyCitroën Drive Plus
Selective unlocking is configured in the 
Settings   > Vehicle touch screen 
application.
Complete unlocking
â–º Press the unlocking button.    
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2Selective unlocking
Driver's door
â–º Press the unlocking button.
The driver's door and the fuel filler flap are 
unlocked (Petrol or Diesel).
The driver's door and the charging flap are 
unlocked (Electric).
â–º
 
Press it 
 again to unlock the other doors and 
the boot.
The charging nozzle can be unplugged on the 
second press.
Complete or selective unlocking, and alarm 
deactivation (depending on version), is confirmed 
by the flashing of the direction indicators.
Depending on version, the door mirrors unfold.
Unlocking and partial opening of the 
boot
â–º Press this button for more than one 
second to unlock the boot.  The boot 
opens slightly.
This action unlocks the vehicle first.
Locking the vehicle  
Normal locking
â–º Press the locking button.
The locking, and the activation of the alarm 
depending on version, is confirmed by the 
lighting of the direction indicators.
Depending on version, the door mirrors fold.
An access (door or boot) that is not  properly closed prevents locking of the 
vehicle. However, if the vehicle is fitted with 
an alarm, it will be activated after 45
  seconds.
If the vehicle is unlocked but the doors or boot 
are not subsequently opened,
  the vehicle 
will automatically lock itself again after about 
30
 
seconds. If the vehicle is fitted with an 
alarm, it will be reactivated automatically.
Deadlocking
Deadlocking renders the interior door 
controls inoperative. It also disables the 
central locking button.
The horn remains operational.
Never leave anyone inside the vehicle 
when it is deadlocked.
â–º
 
Press the locking button.
â–º
 
Press the locking button again within 3 
seconds to deadlock the vehicle (confirmed by 
the temporary lighting of the direction indicators).
For the vehicles equipped with the Proximity 
Keyless Entry and Start system, a double 
audible signal indicates that the vehicle is not 
deadlocked.
With MyCitroën Drive Plus, depending on 
version, the activation/deactivation of the 
lock audible signal is configured in the 
Settings
  > Vehicle touch screen application.
Opening / Closing the 
windows
Opening the windows
â–º Press the unlocking button for more 
than 3 seconds.
Depending on version, the windows stop when 
the button is released or by pressing the button 
a second time.
Closing the windows and sunroof 
(depending on version)
â–º Press the locking button for more than 
3 seconds.
Depending on version, the windows and the 
sunroof stop when the button is released or by 
pressing the button a second time.
Ensure that no person or object could 
prevent the correct closing of the 
windows and sunroof.
If, on versions with alarm, you want to 
leave the windows and/or sunroof partially 
open, you must first deactivate the interior 
volumetric alarm protection.
For more information on the  Alarm, refer to 
the corresponding section.
Remote lighting of the 
lamps
(Depending on version)    
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â–º Press this button. The sidelamps, 
dipped beam headlamps, number plate 
lamps and door mirror spotlamps come on for 30 
seconds.
Pressing again before the end of the timed 
period switches off the lamps immediately.
Advice
Remote control
The remote control is a sensitive, high-
frequency device; avoid handling it in your 
pocket, due to the risk of unintentionally 
unlocking the vehicle.
Avoid pressing the remote control buttons 
while out of range of the vehicle, due to 
the risk of rendering the remote control 
inoperative. It would then be necessary to 
reset it.
The remote control does not work
  when the 
key is in the ignition switch, even when the 
ignition is switched off.
Anti-theft protection
Do not modify the electronic vehicle 
immobiliser, as this might result in 
malfunctions.
For vehicles with a key ignition switch, 
remember to remove the key and turn the 
steering wheel to engage the steering lock.
Locking the vehicle
Driving with the doors locked could make 
it more difficult for the emergency services 
to enter the passenger compartment in an 
emergency.
As a safety precaution, remove the key from 
the ignition or take the electronic key with you 
when leaving the vehicle, even for a short 
time.
Purchasing a second-hand vehicle
Have the key codes memorised by a 
CITROËN dealer, to ensure that the keys in 
your possession are the only ones able to 
start the vehicle.
Proximity Keyless Entry 
and Start
This is a Keyless Entry and Start system.
It enables automatic vehicle locking/unlocking 
simply by detecting the electronic key.
As long as the driver has the electronic key 
on their person, the vehicle unlocks as they 
approach and locks when they walk away.
Key recognition zones:
 
 
Zone A: welcome lighting on approaching 
the vehicle (between 3 and 5   metres from the 
vehicle).
Zone B: automatic locking on moving away from 
the vehicle (about 2
  metres from the vehicle).
Zone C: automatic unlocking on approaching 
the vehicle (between 1 and 2
  metres from the 
vehicle).
Activation/Deactivation
With Touch screen BLUETOOTH audio 
system or MyCitroën Play
The automatic functions are configured  via the Driving touch screen menu.
With MyCitroën Drive
The automatic functions are configured via the Vehicle touch screen menu.
With MyCitroën Drive Plus
The automatic functions are configured in the Settings   > Vehicle touch screen 
application.    
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2Unlocking the vehicle 
 
With Touch screen BLUETOOTH audio 
system or MyCitroën Play
Selective unlocking is configured in the 
Driving touch screen menu.
With MyCitroën Drive
Selective unlocking is configured in the 
Vehicle touch screen menu.
With MyCitroën Drive Plus
Selective unlocking is configured in the 
Settings  > Vehicle touch screen 
application.
Complete unlocking
The vehicle (doors and boot) unlocks 
automatically as the driver approaches in zone 
C, if the automatic functions are activated.
Depending on version, you can also unlock 
the vehicle by gently pressing the driver's door 
handle or the button on the boot.
Unlocking, and alarm deactivation (depending 
on version), is confirmed by the flashing of the 
direction indicators.
Depending on version, the door mirrors unfold.
If the electronic key remains around the 
vehicle (zones  A, B or C) for more than 
15 minutes without action, the automatic 
functions are deactivated. To unlock or lock 
the vehicle, use the remote control or, 
depending on version, press the driver's door 
handle.
If using the door handle does not lock/unlock 
the vehicle, bring the electronic key closer 
and repeat the desired action.
Selective unlocking
Driver’s door
It operates automatically when approaching 
the driver’s door, if the automatic functions are 
activated.
Depending on version, it can also operate by 
gently pressing the driver's door handle.
The driver's door and the fuel filler flap are 
unlocked (Petrol or Diesel).
The driver's door and the charging flap are 
unlocked (Electric).
â–º
 
Once inside the vehicle, to unlock all 
accesses, press the central locking button or pull 
the opening control on any door
.
Selective unlocking of the tailgate
The tailgate unlocks automatically as you 
approach the rear of the vehicle.
â–º 
Press the tailgate control to open the boot.
The doors remain locked.
Locking the vehicle
With MyCitroën Drive Plus
Depending on version, the activation/
deactivation of the lock audible signal is 
configured in the  Settings
  > Vehicle touch 
screen application.
Normal locking
With the doors and boot closed, the vehicle 
locks automatically upon leaving zone  B, if the 
automatic functions are activated.
 
 
Depending on version, you can also lock the 
vehicle by gently pressing the driver's door 
handle.
Locking is confirmed by the lighting of the 
direction indicators, and by a double audible 
signal when the vehicle is locked upon walking 
away.
The alarm does not activate when  locking automatically from a distance (the 
direction indicators do not light up).    
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It is not possible to lock the vehicle if the 
electronic key is left inside the vehicle.
Deadlocking  
Deadlocking renders the interior door 
controls inoperative. It also deactivates 
the central locking button.
The horn remains operational.
Never leave anyone inside the vehicle 
when it is deadlocked.
 
 
â–º Gently press the driver's door handle to lock 
the vehicle.
â–º
 
Press it again within 3
   seconds to deadlock 
the vehicle (confirmed by the temporary lighting 
of the direction indicators).
A double audible signal indicates that the vehicle 
is not deadlocked.
Advice
If one of the doors or the boot is still open 
or if the electronic key for the Keyless 
Entry and Start
 
 system has been left inside 
the vehicle, central locking will not take place.
If the vehicle is unlocked but the doors or 
tailgate are not subsequently opened, the 
vehicle will automatically lock itself again after 
about 30
  seconds. If fitted to the vehicle, the 
alarm is automatically reactivated (if 
previously activated).
Automatic folding/unfolding of the door  mirrors is configured in the touch screen.
For more information on  Mirrors, refer to the 
corresponding section.
As a safety measure, never leave the  vehicle, even for a short time, without 
taking the Keyless Entry and Start system’s 
electronic key with you.
Be aware of the risk of theft of the vehicle if 
the key is present in one of the defined areas 
while the vehicle is unlocked.
In order to preserve the battery in the 
electronic key and the vehicle's battery:
–
 
The unlocking
   on approach function 
(zone
  C) automatically switches to hibernation 
mode after several days (approximately one 
week) without being used. To unlock the 
vehicle, use the remote control or press on 
one of the door handles. The next time the 
vehicle is started, the automatic unlocking 
and locking functions will be reactivated.
–
 
If the welcome lighting is triggered 
several times in succession without the 
vehicle subsequently being started, it will be 
deactivated.
–
 
All "hands-free" functions switch to 
hibernation mode after 21 days without being 
used. 
To restore these functions, unlock the 
vehicle using the remote control and start the 
engine.
Electrical interference
The electronic key may not work if it is 
close to an electronic device (e.g.
  mobile 
telephone (switched on or on standby), laptop 
computer, strong magnetic fields). If this 
occurs, move the electronic key away from 
the electronic device.
Central locking 
 
 
 
Manual
â–º Press this button to lock/unlock the vehicle 
(doors and boot) from inside the passenger 
compartment.     
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2Central locking does not take place if any 
of the doors are open.
When locking/deadlocking from the 
outside
When the vehicle is locked or deadlocked 
from the outside, the indicator lamp flashes 
and the button is deactivated.
â–º
 
After normal locking, pull one of the 
interior door controls to unlock the vehicle.
â–º
 
After deadlocking, you must use the 
remote control or the
  Keyless Entry and Start 
system to unlock the vehicle.
Automatic (anti-intrusion  security)
The doors and boot lock automatically while 
driving (speed above 6 mph (10
  km/h)).
To deactivate/reactivate this function (activated 
by default):
â–º
 
Press the button until a confirmation 
message appears.
Transporting long or voluminous 
objects
Press the central locking control to drive 
with the boot open and the doors locked. 
Otherwise, every time the speed of the 
vehicle exceeds 6 mph (10 km/h), the sound 
of the locks rebounding will be heard and an 
alert will be displayed.
Back-up procedures
Lost keys, remote control, 
electronic key
Go to a CITROËN dealer with the vehicle's 
registration certificate, your personal 
identification documents and if possible, the label 
bearing the key code.
The CITROËN dealer will be able to retrieve the 
key code and the transponder code, enabling a 
new key to be ordered.
Complete unlocking/locking 
of the vehicle with the key
Use this procedure in the following situations:
–  Remote control battery discharged.
–
 
Remote control malfunction.
–
 
V
 ehicle battery discharged.
–
 
V
 ehicle in an area subject to strong 
electromagnetic interference.
In the first case, change the remote control 
battery.
In the second case, reinitialise
  the remote 
control.
Refer to the corresponding sections.
 
 
â–º Insert the key in the door lock.
â–º  T urn the key towards the front or the rear to 
unlock or lock the vehicle.
If the vehicle is fitted with an alarm, it will 
not be activated when locking with the 
key.
If the alarm is activated, the siren sounds 
when the door is opened; switch on the 
ignition to stop it.
Central locking not 
functioning
Use these procedures in the following cases:
–  Central locking malfunction.
–
 
Battery disconnected or discharged.
In the event of a malfunction of the 
central locking system, the battery must 
be disconnected to ensure that the vehicle is 
locked fully.
Front left-hand door
â–º Insert the key into the lock and turn it towards 
the front or rear of the vehicle to lock and unlock 
the door
.
Other doors
Unlocking
â–º Pull the interior door opening control.   
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Locking 
 
â–º Open the doors.
â–º  For the rear doors, check that the child lock 
is not on.
Refer to the corresponding section.
â–º
 
Gently insert the key into the latch located in 
the door lock, then turn the latch an eighth of a 
turn towards the outside of the door
.
â–º
 
Close the doors and check from the outside 
that the vehicle is locked.
Changing the battery
If the battery is flat, this warning lamp 
comes on, accompanied by an audible 
signal and the display of a message.
Battery type: CR2032/3 volts.
Without Keyless Entry and Start
 
 
With Keyless Entry and Start 
 
â–º Unclip the cover by inserting a small 
screwdriver in the slot and lift the cover .
â–º
 
Remove the flat battery from its housing.
â–º
 
Put the new battery in place, respecting the 
polarity
. Start by inserting it into the contacts 
located in the corner, then clip the cover onto 
the unit.
â–º 
Reinitialise the remote control.
For more information on  Reinitialising the 
remote control
, refer to the corresponding 
section.
Do not throw remote control batteries 
away, as they contain metals that are 
harmful to the environment. Take them to an 
approved disposal point.
This equipment contains a button type  battery.
Do not swallow the battery. Risk of chemical 
burns!
Swallowing the battery can cause serious 
internal burning in only 2 hours and can be 
fatal.
If batteries have been swallowed or inserted 
into a part of the body, seek immediate 
medical advice.
Keep new and used batteries out of the reach 
of children.
If the battery compartment does not close 
properly, stop using the product and keep it 
out of the reach of children.
Risk of explosion if the battery is 
replaced with an incorrect type!
Replace the battery with the same type.   
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2Risk of explosion or leaking of 
inflammable liquid or gas!
Do not use in/store in/place in an environment 
where the temperature is extremely high or 
where the pressure is extremely low due to 
very high altitude.
Do not try to burn, crush or cut a used battery.
Reinitialising the remote 
control
Following replacement of the battery or in 
the event of a fault, it may be necessary to 
reinitialise the remote control.
Without Keyless Entry and Start 
 
â–º Switch the ignition off.
â–º  T urn the key to position 2 (Ignition on) .
â–º
 
Immediately press the closed padlock button 
for a few seconds. â–º
 
Switch off the ignition and remove the key 
from the ignition switch.
The remote control is now fully operational 
again.
With Keyless Entry and Start 
 
â–º Insert the mechanical key (incorporated into 
the remote control) into the lock to open the 
vehicle.
â–º
 
Place the electronic key against the back-up 
reader on the steering column and hold it there 
until the ignition is switched on.
â–º
 
W
 ith a manual gearbox, place the gear lever 
in neutral then fully depress the clutch pedal.
â–º
 
W
 ith an automatic gearbox or drive 
selector, while in mode
 
P
 , depress the brake 
pedal.
â–º
 
Switch on the ignition by pressing the 
"
START/STOP" button.
If the fault persists after reinitialisation, contact a 
CITROËN dealer or a qualified workshop without 
delay.
Doors
Opening
From outside
â–º After unlocking the vehicle or with the 
"Keyless Entry and Start" system electronic key 
in the recognition zone, pull the door handle.
From inside
â–º Pull the interior opening control of a door; this 
unlocks the vehicle completely .
With selective unlocking activated:
– Opening the driver's door unlocks 
the driver's door only (if the vehicle has not 
already been completely unlocked).
–
 
Opening one of the passenger doors 
unlocks the rest of the vehicle.   
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Boot
Opening 
 
â–º After unlocking the vehicle, press the opening 
control and then lift the tailgate.
Opening from the inside 
 
 
 
â–º Press the boot opening button located on the 
dashboard.
The tailgtate is released and opens slightly
.
Closing
â–º Lower the tailgate using one of the interior 
grab handles.
In the event of a malfunction or if you 
experience difficulty opening or closing 
the tailgate, have it checked by a CITROËN 
dealer or a qualified workshop without delay, 
to avoid the issue deteriorating and prevent 
any risk of the tailgate dropping, potentially 
causing serious injury.
Back-up release
To manually unlock the boot in the event of a 
battery or central locking failure.
Unlocking
â–º Fold the rear seats to gain access to the lock 
from inside the boot.
 
 
â–º Insert a small screwdriver into hole  A  of the 
lock to unlock the boot.
â–º
 
Move the latch to the left.
Locking after closing
If the fault persists after closing again, the boot 
will remain locked.
In the event of a fault with the central 
locking system, it is essential to 
disconnect the battery to lock the boot and so 
ensure complete locking of the vehicle.
Alarm
(Depending on version) 
 
 
 
System which protects and provides a deterrent 
against theft and break-ins.
Exterior perimeter monitoring
The system checks for opening of the vehicle.
The alarm is triggered if anyone tries to open a 
door, the boot or the bonnet, for example.
Interior volumetric monitoring
The system checks for any variation in volume in 
the passenger compartment.   
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2The alarm is triggered if anyone breaks a 
window, enters the passenger compartment or 
moves inside the vehicle.
Self-protection function
The system checks whether any of its 
components are out of service.
The alarm is triggered if the battery, the central 
control or the siren wiring is put out of service or 
damaged.
Work on the alarm system
Contact a CITROËN dealer or a qualified 
workshop.
Locking the vehicle with full 
alarm system
Activation
â–º Switch off the ignition and exit the vehicle.
â–º  Lock or deadlock the vehicle using the 
remote control or by pressing on the driver's 
door handle.
When the monitoring system is active, the red 
indicator lamp in the button flashes once per 
second and the direction indicators come on for 
about 2 seconds.
The exterior perimeter monitoring is activated 
after 5 seconds and the interior volumetric 
monitoring after 45 seconds.
The alarm does not activate when  locking automatically from a distance.
If an opening (door, boot or bonnet) is not 
properly closed, the vehicle is not locked, 
but the exterior perimeter monitoring will be 
activated after 45 seconds, at the same time 
as the interior volumetric monitoring.
Deactivation
â–º Press one of the remote control unlocking 
buttons:
Short press. 
Long press. 
or
â–º
 
Unlock the vehicle by pressing the driver
 ’s 
door handle.
The monitoring system is deactivated: the 
indicator lamp in the button goes off and the 
direction indicators flash for about 2 seconds.
After unlocking using the remote 
control
If the vehicle automatically locks itself again 
(as happens if a door or the boot is not 
opened within 30 seconds of unlocking), the 
monitoring system is automatically activated.
Locking the vehicle 
with exterior perimeter 
monitoring only
Deactivate the interior volumetric monitoring to 
avoid the unwanted triggering of the   alarm,   in 
certain cases such as:
–
 
Slightly open window
 .
–
 
W
 ashing the vehicle.
–
 
Changing a wheel.
–
 
T
 owing the vehicle.
–
 
T
 ransport on a ship or ferry.
Deactivating interior volumetric 
monitoring
â–º Switch off the ignition and within 10   seconds 
press the alarm button until the indicator lamp is 
on fixed.
â–º
 
Exit the vehicle.
â–º
 
Immediately lock the vehicle using the remote 
control or by pressing on the driver's door 
handle.
Only exterior perimeter monitoring is activated; 
the red indicator lamp in the button flashes every 
second.
T
o take effect, this deactivation must be 
performed whenever the ignition is switched 
off.