Opel Cascada Owner's Manual page 47

Keys, doors and windows 45
The airbag control indicator v
illuminates if the anti-roll bars have
been deployed.
The system deploys with the soft top
opened or closed.
The soft top must not be operated if
the anti-roll bars have been deployed.
A continuous warning will sound and
a message appears in the Driver
Information Centre if the switch is
actuated.