2021-2023 Citroen C4 Keys Instruction Guide
Although they are frequently ignored, a car’s keys open the door to your driving experience. These keys serve a greater purpose in the Citroen C4 from 2021 to 2023 than just starting your car. They provide you with access to a world of innovative and cutting-edge automobile technologies.
You hold the key to a dynamic driving experience that flawlessly combines style, comfort, and performance when you have the Citroen C4’s keys in your hands. This article will help you get the most out of your ownership experience by examining the features, capabilities, and operations of the keys for the 2021–2023 Citroen C4. Understanding the Citroen C4’s keys is the first step in releasing its full potential, whether you’re the proud owner of one or are considering using it for your upcoming expedition.
Remote Control Function
The remote control can be used for the following remote functions, depending on version:
- Unlocking/Locking/Deadlocking the vehicle.
- 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. Without Keyless Entry and Start
To unfold or fold the key, press the button. With Keyless Entry and Start 
To Reject 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 Selective unlocking is configured in the Driving/Vehicle touch screen menu.
Complete unlocking
- Press the unlocking button.
Selective unlocking Driver’s door and fuel filler/charging flap
- Press the unlocking button.
- 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.
Locking the vehicle Normal locking
- 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.
- Press the locking button.
- 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.
Opening / Closing the windows
Opening the windows 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)
Press the locking button for more than 3 seconds. 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
- 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 memorized 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. If the electronic key is present in an area between 2 and 7 m from the vehicle for more than 30 minutes, the system is deactivated to preserve the battery. Key recognition zones: 
Zone A: welcome lighting on approaching the vehicle (between 3 and 5 metres from the vehicle).
Zone B: automatic locking on leaving the vehicle (about 2 metres from the vehicle).
Zone C: automatic unlocking on approaching the vehicle (between 1 and 2 metres from the vehicle). The automatic functions are configured via the Driving/Vehicle touch screen
Unlocking the vehicle 
Selective unlocking is configured via the Driving/Vehicle touch screen menu. Selective unlocking is deactivated by default.
Complete unlocking
The vehicle (doors and boot) unlocks:
- Either automatically as the driver approaches in zone C, if the automatic functions are activated.
- Or by gently pressing the driver’s door handle.
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 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 and fuel/charging flap They unlock:
- Either automatically when approaching the driver’s door, if the automatic functions are activated.
- Or by gently pressing the driver’s door handle.
- Once inside the vehicle, to unlock all accesses, press the central locking button or pull the opening control on any door.
Locking the vehicle Normal locking 
With the doors and boot closed, the vehicle locks:
- Either automatically, upon leaving zone B, if the automatic functions are activated.
- Or 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). 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. 
- Gently press the driver’s door handle to lock the vehicle.
- 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 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. The automatic door mirror folding/ unfolding function is configured via the touch screen’s Driving/Vehicle menu. 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 Press this button to lock/unlock the vehicle (doors and boot) from inside the passenger compartment. Central 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.
- After normal locking, pull one of the interior door controls to unlock the vehicle.
- 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):
- 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.
- Vehicle battery discharged.
- Vehicle 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. 
- Insert the key in the door lock.
- Turn the key towards the front or the rear to unlock or lock the vehicle.
FAQ’s
A remote key fob with keyless entry and start is mainly used on Citroen C4 vehicles.
A certified locksmith or a Citroen dealership are also good places to get a spare key.
Hold the key fob inside the vehicle while pressing the brake pedal twice to start the vehicle.
Install a fresh battery in the key fob. For instructions on replacing your battery, go to your owner’s handbook.
A certified technician or a Citroen dealership should do key fob programming.
You can manually lock and unlock the doors using the physical key blade that is concealed inside the key fob.
A few meters away from the car is normally the range, though it can vary.
You can customize the key fob on several Citroen models. To learn more about the various settings, consult your owner’s handbook.
A keyless emergency access code might be available on some models. For further information, check your owner’s handbook or speak with your dealer.
A replacement key fob must be ordered and programmed at a Citroen dealership.
You might be able to turn off the keyless entry system on some models. If you need instructions, consult your owner’s manual.
The key fob on some Citroen vehicles might support remote starting. For details, consult your owner’s handbook.
To avoid remote hacking, keep your key fob in a safe place and think about using a signal-blocking pouch.
In order to prevent problems, it is typically advised to have a Citroen dealership or technician complete key fob programming.
To guarantee the key fob works properly, keep it away from high temperatures, moisture, and physical damage.
Useful Link
View Full PDF:2021-2023 Citroen C4 User’s Manual | Auto User Guide
