From Inside; From Outside - CITROEN DS4 Owner's Handbook Manual

Doors
Opening

From outside

 After unlocking the vehicle completely
using the remote control or the key, pull the
door handle.
When the selective unlocking is
activated, the first press of the remote
control unlocking button permits
unlocking of the driver's door only.

From inside

 Pull the interior control lever of a front door;
this unlocks the vehicle completely.
With the selective unlocking activated:
- opening the the driver's door
unlocks the driver's door only (if the
vehicle has not already been
completely unlocked).
- opening one of the passenger
doors unlocks the rest of the
vehicle.
Closing
When a door is not closed correctly:
- when the engine is running ,
this warning lamp comes
on, accompanied by an alert
message for a few seconds,
- when the vehicle is moving (speed
higher than 6 mph (10 km/h)), this warning
lamp comes on, accompanied by an alert
message for a few seconds.