How do the back seats in a Citroen C4 Picasso fold down?

If you mean the 3 behind the driver, I think the seats have to be all the way back (using the lever at the front of the seat base). Now look at the rear of the seat, in the centre of the base you will see a red pull cord, you simply pull the cord and push the backrest down. Pull on the black pullcord on the backrest to raise it again, making sure it clicks into place.

When these seats are down, look on the seat back, there may be a tray you unclip and fold over onto the boot floor to make the floor flat. If lowering the rear pair of seats on a Grande Picasso fold back the boards behind the seats, you will see the red pull cord on the seat base. Pull on the cord and lower the seat fully IN ONE COMPLETE MOVE.

If you fold the seat half way and then decide to raise it again the mechanism will jam and you may damage the seat. To lift it pull on the black pull cord on the seat back and again pull the seat all the ... more.

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