CITROËN DS5 Owner's Handbook Manual page 57

Locking the front and rear
passenger doors
 Open the doors.
 On the rear doors, check that the child lock
is not on (see the corresponding section).
 Remove the black cap, located on the edge
of the door, using the key.
 Insert the key in the socket without forcing
it, then without turning it, move the latch
sideways towards the inside of the door.
 Remove the key and refit the cap.
 Close the doors and check that the vehicle
has locked correctly from the outside.
Unlocking the front and rear
passenger doors
 Pull the interior door opening control.
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Access