CITROËN DS 4 Handbook page 248

Access to bulbs
Depending on the engine and only on the left
hand side, you must first carry out the following
operations for access to the protective covers
on the bulbs.
F Remove the air deflector by unclipping
each of its three attachment points.
F Unclip the bonnet release cable at its
two fixings.
F Move the cable down.
After changing the failed bulb, remember to
put everything back in place (cable and air
deflector).
Changing direction indicator
bulbs
Rapid flashing of the direction indicator
warning lamp (right or left) indicates the
failure of a bulb on that side.
Model with halogen headlamps (type 1)
F Turn the bulb holder a quarter of a turn and
extract it.
F Pull out the bulb and change it.
To reassemble, carry out these operations in
reverse order.
Model with halogen (type 2) and xenon
headlamps
For the replacement of this type of LED lamp,
contact a CITROËN dealer or a qualified
workshop.
Amber coloured bulbs, such as the
direction indicators, must be replaced
with bulbs of identical specifications
and colour.