CITROEN DS4 Owner's Handbook Manual page 264

Changing the LED lamps/sidelamps
For the replacement of this type of LED lamp,
contact a CITROËN dealer or a qualified
workshop.
Number plate lamps (W5W)
To facilitate the removal of the lamp, carry out
this operation with the tailgate half open.
Insert a thin screwdriver into the lens
cutout.
Push it outwards.
Remove the lens.
Change the faulty bulb.
To refit, press on the lens to clip it in place.
Third brake lamp (LEDs)
For the replacement of this type of LED lamp,
contact a CITROËN dealer or a qualified
workshop.