CITROËN C4 Picasso Owner's Handbook Manual page 278

Practical information
The headlamps are fitted with
polycarbonate glass with a protective
coating:
do not clean them using a dry
or abrasive cloth, nor with a
detergent or solvent product,
use a sponge and soapy water or a
pH neutral product,
when using a high pressure washer
on persistent marks, do not keep
the lance directed towards the
lamps or their edges for too long,
so as not to damage their protective
coating and seals.
Changing a bulb should only be done
after the headlamp has been switched
off for a few minutes (risk of serious
burns).
Do not touch the bulb directly with
your fingers, use a lint-free cloth.
It is imperative to use only anti-
ultraviolet (UV) type bulbs to avoid
damaging the headlamp.
Always replace a failed bulb with a
new bulb with the same type and
specification.
280
Directional dipped beam
headlamps (xenon model)
D5S xenon bulbs must be changed
by a CITROËN dealer or a qualified
workshop, as there is a risk of
electrocution.
In the event of failure of one of the D5S
bulbs, it is recommended that the bulb
on the other side be changed at the
same time.
Main beam headlamps (xenon model)
Remove the protective plastic cover by
pulling the tab.
Push the connector.
Remove the bulb and change it.
For reassembly, carry out these operations in
reverse order.