Vauxhall ASTRA Owner's Manual page 224

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Control indicator
Illuminated
Fault in the system. The system is not ready
for operation. Have the fault remedied. We
recommend that you consult your Vauxhall
Authorised Repairer. The system's
integrated self-diagnostics allows faults to
be quickly remedied.
If it flashes
The fault is due to sensors obstructed with
snow or ice. The sensors must be
undamaged and free of dirt, snow and ice.
Interference due to external sources of
ultra sound (e.g. pneumatic drills, rotary
machines). Once the source of interference
is removed, the system will operate
normally.
Drive Control Systems
Caravan/trailer towing equipment 3,
caravan/trailer towing
The system automatically detects if a
towbar is properly fitted to the vehicle.
When towing, the parking distance sensor
is automatically deactivated when the
trailer cable is plugged into the socket.
Fitting rear load racks 3
Rear load racks, e.g. bicycle racks, fitted
near the sensors could disrupt the system.
Observe the note on the Astra TwinTop on
page 151.
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