Locking the release catch of the centre rear seat backrest
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.
Requirements:
The left and centre seat backrests are engaged and joined together.
You can lock the centre seat backrest release catch if you want to secure the boot against unauthorised access. The centre seat backrest can then be folded forwards only together with the left seat backrest.
Fold the centre and left seat backrests forwards.
To lock or unlock:
slide the catch 
upwards or downwards.