CITROËN C4 Handbook page 247

For BlueHDi Diesel versions
If your vehicle has an electric parking brake,
the jack is stowed in a bag placed in the boot.
If your vehicle has a manual parking brake,
the jack is stowed under the spare wheel and
under the storage box:
F remove the "space-saver" type spare
wheel,
F remove the polystyrene storage box,
F push the jack forward, then lift it by its rear
part.
In the event of a breakdown
Access to the spare wheel
The spare wheel is installed in the boot under
the floor.
Depending on version, the spare wheel may be
a standard size steel or alloy wheel; for some
countries of sale it is the "space saver" type.
For access to the spare wheel, first refer to
"Access to the tools" in this section.
If your vehicle has an electric parking
brake, only a "space saver" type of
wheel can be stowed in the boot.
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