Saab 2003 9-3 Owner's Manual page 17

Backrest rake angle
WARNING
The backrest should be upright during
driving, so that the safety belt, airbag and
backrest can provide optimum protection
in the event of emergency braking or a
crash, in particular a rear-end collision.
To find the most comfortable position, turn
the knob to provide stepless adjustment of
the backrest.
Adjusting the backrest
Safety
Lumbar support
Adjust the firmness of the lumbar support by
turning the knob.
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