CITROËN C4 Handbook page 76

Access
Triggering of the alarm
This is indicated by sounding of the siren
and flashing of the direction indicators for
thirty seconds.
The monitoring functions remain active until
the alarm has been triggered eleven times in
succession.
When the vehicle is unlocked using the remote
control or the Keyless Entry and Starting
system, rapid flashing of the indicator lamp
in the button informs you that the alarm was
triggered during your absence. When the
ignition is switched on, this flashing stops
immediately.
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Failure of the remote control
To deactivate the monitoring functions:
F unlock the vehicle using the key (integral to
the remote control) in the driver's door lock,
F open the door; the alarm is triggered,
F switch on the ignition; the alarm stops; the
indicator lamp in the button goes off.
Locking the vehicle without
activating the alarm
F Lock or deadlock the vehicle using the
key(integral to the remote control) in the
driver's door lock.
Operating fault
When the ignition is switched on, fixed
illumination of the indicator lamp in the button
indicates a fault with the system.
Have it checked by a CITROËN dealer or a
qualified workshop.