CITROËN C4 PICASSO Handbook page 310

In the event of a breakdown
Lamps on the tailgate
Identify the failed bulb.
F Open the boot.
F Remove the access cover.
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F Remove the three lamp fixing screws A.
F Disconnect the lamp connector.
F Carefully remove the lamp from its housing.
F Turn the bulb holder a quarter of a turn
anti-clockwise and pull the bulb out.
F Change the bulb.
For reassembly, carry out these operations in
reverse order.
Model with LED lamps
Model with conventional bulb lamps