Vauxhall VIVARO Owner's Manual page 49

Backrest inclination
Pull lever, adjust inclination and
release lever. Allow the backrest to
engage audibly.
Do not lean on backrest when
adjusting.
Seat height
Lever pumping motion:
up : seat higher
down : seat lower
Seats, restraints
Lumbar support
Adjust lumbar support using
handwheel to suit personal
requirements.
Rotate handwheel to increase and
decrease support.
47