Folding back the rear seat backrest
WARNING Risk of becoming trapped when adjusting the seats
When you adjust a seat, you may trap yourself or a vehicle occupant.
When adjusting a seat, make sure that no one has any body parts in the sweep of the seat.
WARNING Risk of accident if the rear bench seat, rear seat and seat backrest are not engaged
The rear bench seat, rear seat and seat backrest may fold forwards, even while the vehicle is in motion.
As a result, the vehicle occupant will be pressed into the seat belt with increased force. The seat belt will not be able to protect as intended and could cause additional injury.
Objects or loads in the boot or load compartment cannot be restrained by the seat backrest.
Make sure that the rear bench seat, the rear seat and the seat backrest are engaged before every trip.
NOTE Damage caused by trapping the seat belt when the seat backrest is folded back
The seat belt could become trapped and thus damaged when the seat backrest is folded back.
Ensure that the seat belt tongue has been inserted at the side in the marked position.
NOTE Damage to the roof lining when the rear seat backrests are folded forwards and backwards
The roof lining could be damaged when the seat backrests are folded forwards and backwards.
Before you fold the seat backrests forwards and backwards, insert the head restraints.
Folding back the rear seat mechanically
Move the driver's or front passenger seat forwards, if necessary.
Swing seat backrest 
back until it engages.
back until it engages. Make sure that the red marking of the lock verification indicator is no longer visible. Otherwise, the seat backrest will not be locked.