CITROEN DS5 Owner's Handbook Manual page 195

Access to the spare wheel
The spare wheel is supported by a cable-driven
carrier underneath the vehicle.
Taking out the wheel
Raise the floor to reveal the spare wheel
carrier drive nut.
Turn this drive nut fully clockwise, using
the wheelbrace 1 and the extension 8, to
unwind the carrier cable.
Practical information
Detach the wheel from the rear of the
vehicle.
Remove the hook with its connection plate
to release the wheel, as shown in the
illustration.
Pull out the wheel.