To get on the third seat, it is necessary to put a back of the back seat which is before it and to shift this seat forward, having pulled a rychazhok or having pressed a pedal. To return a back seat on the place, pull it back, yet you will not hear the click demonstrating that the seat is recorded. 

Prevention When you return a back seat in a starting position, do not pull it for the thongs intended for folding of a seat.