BMW Z4 Roadster Owner's Handbook Manual page 179

Display in the instrument cluster
The symbol is illuminated green: a lane
marking has been detected on at least
one side of the vehicle and warnings can
be issued.
Warning function
When leaving the lane
If the vehicle leaves the lane and the lane mark‐
ing is detected, the steering wheel vibrates in ac‐
cordance with the steering wheel vibration set‐
ting.
If the turn indicator is switched on before chang‐
ing lanes, no warning is issued.
Steering intervention
If a lane marking is crossed in the speed range
up to 210 km/h, approx. 130 mph, the system
may intervene not only by vibrating but also with
a brief active steering intervention. The steering
intervention helps to keep the vehicle in lane.
Steering intervention can be felt at the steering
wheel, and can be overridden manually at any
time. With active steering intervention, the dis‐
play flashes in the instrument cluster.
Warning signal
If the system executes an active steering inter‐
vention multiple times within 3 minutes without
the driver touching the steering wheel, an acous‐
tic warning is emitted. A short warning signal
sounds on the second steering intervention. A
longer warning signal sounds from the third
steering intervention onwards.
A Check Control message is also displayed.
The warning signal and Check Control message
tell the driver to pay more attention to the lane.
Cancellation of the warning
The warning is interrupted in the following situa‐
tions:
Online Edition for Part no. xxx - X/18
Safety
▷ Automatically after approximately 3 seconds.
▷ On returning to the correct lane.
▷ If the vehicle is braking heavily.
▷ On indicating.
▷ If Dynamic Stability Control DSC intervenes.
System limits
Safety note
WARNING
The system may not respond at all, or may re‐
spond too late, incorrectly or without justifica‐
tion due to limits of the system. There is a dan‐
ger of accidents or damage to property.
Observe the information on the system limits
and intervene actively if necessary.
Functional limitations
The system may have limited functionality in the
following situations, for example:
▷ In thick fog, wet conditions or snow.
▷ When there are missing, worn, poorly visible,
merging/separating or ambiguous lane mark‐
ings; for example, in areas where there are
roadworks.
▷ If lane markings are covered by snow, ice, dirt
or water.
▷ On sharp bends or narrow roads.
▷ If lane markings are not white.
▷ If lane markings are obscured by objects.
▷ If the vehicle is too close to the vehicle ahead.
▷ When there is sustained glare due to oncom‐
ing light, for example the sun is low in the sky.
▷ If the field of view of the camera or the wind‐
screen in front of the rear-view mirror is soiled
or covered.
▷ If the camera has overheated due to exces‐
sively high temperatures and has been tem‐
porarily deactivated.
CONTROLS
179