CITROËN C4 Picasso Owner's Handbook Manual page 232

Safety
2 row centre seat belt
nd
The seat belt for the centre rear seat is built into the roof.
Fastening
Pull the strap and insert the tongue A into
the right hand buckle.
Insert tongue B into the left hand buckle.
Check that each buckle is correctly
fastened by pulling on the belt webbing.
232
Unfastening
Press the red button in buckle B , then
buckle A.
Guide the seat belt as it reels in and place
the tongue B and then A on the magnet in
the roof anchorage point.
Before any operation of the rear seats,
to avoid damage to the seat belts
check that there is no slack in the outer
belts and secure their tongues on the
anchorage points. The centre seat belt
must be fully reeled in.
3rd row seat belts
Fastening
Detach the seat belt strap from its retaining
loop located on the side trim of the boot.
Pull on the strap and insert the tongue into
the buckle.
Check that the buckle is correctly fastened
by pulling on the belt strap.
Unfastening and stowing
Press the red button in buckle.
Guide the seat belt strap as it reels in.
Secure the strap, flat in the retaining loop.
Ensure that the the seat belts are
secured when not in use.