CITROËN C4 Handbook page 72

Access
Anti-intrusion security
This system allows automatic simultaneous locking of the doors and boot as soon as the speed of
the vehicle exceeds 6 mph (10 km/h).
Operation
If one of the doors or the boot is open, the
automatic central locking does not take place.
This is signalled by the sound of
the locks rebounding, accompanied
by illumination of this symbol in the
instrument panel, an audible signal
and the display of an alert message.
Carrying long and voluminous
objects
If you want to drive with the boot open,
you should press the central locking
button to lock the the doors. Otherwise,
every time the speed of the vehicle
exceeds 6 mph (10 km/h), the locks
will rebound and the alerts mentioned
above will appear.
Pressing the central locking button unlocks the
vehicle.
Above 6 mph (10 km/h), this unlocking is
temporary.
70
Activation / Deactivation
You can activate or deactivate this function
permanently.
F With the ignition on, press this button
until an audible signal starts and a
corresponding message is displayed.
The state of the system stays in memory when
switching off the ignition.