Press and hold down the lock button on the key for 10 seconds. Check the central locking system by unlocking and locking the door consecutively.(if fitted - ignore this step if not ) Turn the engine on again and finish inspecting the system. Following any other procedure could cause malfunctioning of different units which depend on BSI. Recently (June 11th 2017) the central locking system on my Citroen C3 exclusive (sensodrive) stopped functioning properly. The rear doors (back seat doors) stayed completely shut, both from the inside and outside. The passenger door in the front could only be opened form the inside and the driver seat door could only be opened manually with the The wiring diagram of the Citroen Xsara Picasso contains all the information needed to place each component in the right spot and connect them together to form a functioning central locking system. It is a detailed, visual representation of all the parts, cables, and plugs that make up the system. The diagram typically includes labels, arrows 6dgCL5.

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