CITROËN C4 Handbook page 74

Access
Locking the vehicle with full
alarm system
Activation
F Switch off the ignition and get out of the vehicle.
F Lock the vehicle with the remote control.
or
F Lock the vehicle with the "Keyless Entry
and Starting" system.
The monitoring system is active: the indicator
lamp in the button flashes once per second
and the direction indicators come on for about
2 seconds.
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Following an instruction to lock the vehicle,
the exterior perimeter monitoring is activated
after a delay of 5 seconds and the interior
volumetric and anti-tilt monitoring after a delay
of 45 seconds.
If an opening (door, boot...) is not closed
fully, the vehicle is not locked but the
exterior perimeter monitoring will be
activated after a delay of 45 seconds at
the same time as the interior volumetric
and anti-tilt monitoring.
Deactivation
F Press the unlocking button on the remote
control.
or
F Unlock the vehicle with the "Keyless Entry
and Starting" system.
The monitoring system is deactivated: the
indicator lamp in the button goes off and the
direction indicators flash for about 2 seconds.
When the vehicle automatically locks
itself again (as happens if a door or
boot is not opened within 30 seconds of
unlocking), the monitoring system is not
reactivated automatically. To reactivate
the system, it is necessary to unlock
the vehicle and then lock it again using
the remote control or the "Keyless Entry
and Starting" system.