Adjusting the seat backrest (comfort rear bench seat)
Only the seat backrests of a comfort rear bench seat can be adjusted.
Pull release handle 
for the seat backrest upwards and hold it in position.
for the seat backrest upwards and hold it in position. Move the seat backrest to the desired position.
Release the seat backrest release handle and move the seat backrest slightly.
and move the seat backrest slightly. The seat backrest will engage in position.