Opel ASTRA Owner's Manual page 54

52 Seats, restraints
Loose or bulky clothing prevents the
belt from fitting snugly. Do not place
objects such as handbags or mobile
phones between the belt and your
body.
9 Warning
The belt must not rest against hard
or fragile objects in the pockets of
your clothing.
Seat belt reminder X, k 3 92.
Removing
To release belt, press red button on
belt buckle.
Using the seat belt while pregnant
9 Warning
The lap belt must be positioned as
low as possible across the pelvis
to prevent pressure on the
abdomen.