CITROEN DS4 Owner's Handbook Manual page 109

Central locking control
This control allows the simultaneous locking or unlocking of the doors and boot from inside the
vehicle.
Locking
Press this button to lock the vehicle.
The red indicator lamp in the button comes on.
If one of the doors is open, central
locking from the inside does not take
place.
Unlocking
Press the button again to unlock the
vehicle.
The red indicator lamp in the button goes off.
If the vehicle is locked from the outside,
this button is inactive.
In this case, use the remote control
or the key to unlock the vehicle or
pull an interior door handle to open
a door.
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Access