CITROËN C4 Picasso Owner's Handbook Manual page 271

Position the spare wheel on the box so that
the positioning indicator will be introduced
into the bolt hole in the middle of the box.
Pass the hook with its connection plate into
the wheel then the box, as illustrated.
Practical information
Raise the wheel/box assembly underneath
the vehicle by turning the carrier drive nut
anticlockwise using the wheelbrace and
the extension.
Tighten fully. When the cable is fully wound
in, rotation of the nut no longer presents
any resistance.
Check that the wheel is horizontally flat
against the floor.
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