Vauxhall 2009 Tigra Owner's Manual page 122

118 Driving and Operation
Ultrasonic parking sensors 3
Parking distance sensors make reverse
parking easier by measuring the distance
between the rear of the vehicle and
obstacles behind it. It is the driver,
however, who maintains full responsibility
for parking.
The system records the distance using four
sensors in the rear bumper.
To activate
The parking distance sensors are activated
automatically when the ignition is switched
on and reverse gear is engaged.
Operational readiness is indicated by a
brief tone.
If the vehicle approaches an obstacle,
a series of acoustic signals sound. The
interval between the signals becomes
shorter as the vehicle gets closer to the
obstacle. When the distance is less than
30 cm, the signal is continuous.
9 Warning
Under certain circumstances, various
reflective surfaces on objects or clothing
as well as external noise sources may
cause the system to fail to detect
obstacles.
To deactivate
The system deactivates automatically
when reverse gear is disengaged.
Fault
In the event of system faults, a permanent
tone sounds at a distance of 1 metre from
the obstacle. Have the cause of the fault
eliminated by a workshop.
In order to avoid operational problems or
erroneous information, the sensors must be
undamaged and free of soiling, snow and
ice.