Rear Parking Assist - Aston Martin DB 9 2010 Manual

If the system has a fault a single three second tone will be heard (only
once per ignition cycle) and the parking assist button LED will blink
when reverse gear is selected or the ignition is set to ON. The system
is automatically disabled when a fault is detected.
Parking assist may sound spurious tones if it detects an ultrasonic
frequency using the same band as the sensors.
The system consists of inner and outer sensors. When
maneuvering forward into a Garage, etc., the front outer sensors will
cease detection if they detect a stationary or receding object for three
seconds or more, this allows detection directly at the front of the
vehicle in this type of manoeuvre.

Rear Parking Assist

(if installed on your vehicle)
Warning: Rear parking assist does not replace need for total
vigilance and caution when parking or reversing.
When parking or reversing make full use of rearward vision
and all mirrors to be aware of persons or objects in the vicinity of
the vehicle. Take appropriate measures to protect them from
danger.
In heavy rain or similar adverse conditions, the rear parking
assist sensors may not always be able to accurately measure
distance to close objects. A fully laden vehicle or irregular
obstacles may also cause inaccurate measurements.
Rear parking assist assists in detecting obstructions as the vehicle is
reversed towards them. The system is ON when reverse gear is
selected. When the system is operating an intermittent 'beep' signal
will be heard. The 'beep' frequency increases in pitch and
persistence as the vehicle reverses to an obstruction.
The 'beeps' start at approximately 5.5 ft (1.7 m) from any
obstruction. The 'beep' becomes continuous at distances less than
1 ft (30 cm).
If reversing into a confined area, i.e. a home garage, the rear
parking assist outer sensors will detect the side walls and, after three
seconds, the 'Beep' sequence will stop. As reversing continues the
rear parking assist inner sensors will detect the rear wall or
obstruction and the 'Beep' sequence will start again.
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