Alarm
Protection and deterrent system against theft and break-in.
It provides the following types of monitoring:
- Perimeter
The system monitors the opening of the vehicle.
The alarm is triggered if someone tries to open a door, the boot, the bonnet...
- Volumetric
The system monitors changes in volume inside the passenger compartment.
The alarm is triggered if someone breaks a window, enters the passenger compartment or moves inside the vehicle.
- Anti-lift
The system monitors the vehicle's attitude (movement).
The alarm is triggered if the vehicle is lifted, moved or impacted.
! Self-protection functionThe system monitors the deactivation of its components.
The alarm is triggered if the battery, the central control unit or the siren wiring is deactivated or damaged.
For any work on the alarm system, consult the CITROËN network. Locking the vehicle with the full alarm system
Locking the vehicle with the full alarm system Activation
- Switch off the ignition and leave the vehicle.
- Press the lock button on the remote control.
The monitoring system is active: the button indicator flashes every second.
After pressing the lock button on the remote control, perimeter monitoring is activated after a 5-second delay, and volumetric and anti-lift monitoring after a 45-second delay.
If an opening (door, boot...) is not properly closed, the vehicle does not lock, but perimeter monitoring will activate after a 45-second delay, at the same time as volumetric and anti-lift monitoring.
Deactivation- Press the unlock button on the remote control.
The alarm system is deactivated: the button indicator light goes off.
Locking the vehicle with perimeter monitoring onlyDeactivate volumetric and anti-lift monitoring to prevent accidental alarm activation in certain cases, such as:
- leaving an animal in the vehicle,
- leaving a window partially open,
- washing your vehicle,
- changing a wheel,
- towing your vehicle,
- transporting the vehicle by boat.
- Switch off the ignition.
- Within ten seconds, press the button until the indicator light stays on steadily.
- Get out of the vehicle.
- Immediately press the lock button on the remote control.
Only perimeter monitoring is activated: the button indicator flashes every second.
For this deactivation to be taken into account, it must be carried out after each ignition switch-off.

Locking the vehicle with perimeter monitoring only Reactivating the volumetric and anti-lift monitoring
- Press the unlock button on the remote control to deactivate perimeter monitoring.
- Press the lock button on the remote control to activate all monitoring functions.
The button indicator flashes again every second.
Triggering the alarmThis results in the horn sounding and the indicator lights flashing for thirty seconds.
The monitoring functions remain active until the alarm has been triggered for the eleventh consecutive time.
When unlocking the vehicle with the remote control, the button indicator light flashing rapidly informs you that the alarm was triggered while you were away. This flashing stops immediately when the ignition is switched on.
Remote control failureTo deactivate the monitoring functions:
- Unlock the vehicle with the key in the driver's door lock.
- Open the door; the alarm is triggered.
- Switch on the ignition; the alarm stops. The button indicator light goes off.
- Lock or double-lock the vehicle with the key in the driver's door lock.
When the ignition is switched on, the button indicator light staying on steadily indicates a system fault.
Have it checked by the CITROËN network.
Automatic activation *2 minutes after the last door or the boot is closed, the system activates automatically.
- To prevent the alarm from being triggered when you get into the vehicle, press the unlock button on the remote control beforehand.
Test yourself
A quick Citroen C5 quiz: every answer comes with an explanation and a link to the manual page.