Porsche 911 Manual page 135

General information
– The system provides assistance when driving at
speeds above approx. 15 km/h (9 mph).
– At speeds below 15 km/h (9 mph), the driver is
supported by the Rear Turn Assist, however, on
the vehicle side where the direction indicator
was actuated and only when driving off.
– The Rear Turn Assist is active up to approx. 20
km/h (12 mph).
– Lane Change Assist and Rear Turn Assist are not
available if the system detects that the radar
sensors are covered.
– The radar sensors can sometimes detect other
objects (e.g. high or raised crash barriers), not
just vehicles.
– The display is designed so that you notice it
merely by glancing at the exterior mirror.
Information
If the position of the radar sensors was changed fol-
lowing an accident, for example, this can impair the
function of Lane Change Assist.
e Visit a qualified specialist workshop. Porsche
recommends a Porsche partner as they have
trained workshop personnel and the necessary
parts and tools.
Information
To ensure that Lane Change Assist can work
properly:
e Do not cover the radar sensors on the rear
bumper with objects (e.g. stickers). Also remove
any dirt, snow and ice from this area.
e Do not cover the warning indicator in the exterior
mirror (e.g. with stickers or self-adhesive blind
spot mirrors).
e Subsequent painting of the bumper may lead to a
reduction in the sensor range owing to the
thicker coating layer. The electrical properties
may also differ from those of the approved
paints.
Fig. 99: Radar sensors in the rear bumper
Operating principle
Lane Change Assist measures the distance and
speed difference of detected vehicles compared to
your vehicle using the radar sensors integrated in the
Lane Change Assist (LCA)
rear bumper. The radar sensors calculate an area of
up to 70 m to the rear (approach zone) and the
blind-spot.
Whenever Lane Change Assist regards the speed
difference and distance as critical for changing
lanes, this is indicated on the relevant exterior mirror.
Both sides of the vehicle are displayed separately.
This is how the warning indicator in the left exterior
mirror assists the driver when changing to the left
lane, for example.
If a vehicle regarded as critical has switched on its
direction indicator, the respective warning indicator
in the exterior mirror flashes brightly and briefly
several times.
When slowly overtaking another vehicle (speed dif-
ference of less than approx. 15 km/h (9 mph)), the
warning indicator lights up as soon as this vehicle is
in your blind-spot area and is detected by Lane
Change Assist. If there is a greater speed difference,
this is not indicated in the exterior mirror.
The speed range of the Lane Change Assist is not
reached immediately after driving off. Until it is
reached, the driver is supported via the Rear Turn
Assist.
When the direction indicator is on, the Rear Turn
Assist detects objects located next to and behind
your vehicle, but only at the side on which the indi-
cator has been activated. If a potential hazard is de-
tected, the respective warning indicator on the
exterior mirror lights up. If your own calculated driv-
ing path crosses that of a detected vehicle on the
side of the vehicle on which the indicator has been
activated, the respective warning indicator on the
exterior mirror will flash brightly and briefly several
times.
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