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Fatigue detection (break recommendation)
Introduction
This chapter contains information on the following subjects:
Function
168
Information messages
168WARNING■ For the driving ability is always the driver's responsibility. Never drive if you
feel tired.■
The system may not detect all cases where a break is needed.
■
Therefore, take regular, sufficient breaks during long trips.
■
There will be no system warning during the so-called micro-sleep.
Note
■ In some situations, the system may evaluate the driving incorrectly and thus
mistakenly recommend a break (e.g. sporty driving, in adverse weather conditions,
or in bad road conditions).■
The fatigue detection system is designed primarily for motorway driving.
Function
First read and observe the introductory information and safety warn-ings
on page 168.
The fatigue detection system advises the driver on the basis of information about
the steering behaviour, to take a break from driving. The system recommends a
break at speeds of 65-200 km/h.
After the ignition has been switched on, the system evaluates the steering be-
haviour for 15 minutes. This baseline analysis is constantly compared with the
current steering behaviour.
If the system detects deviations from normal steering behaviour due to possible
fatigue of the driver, it recommends to take a break from driving.
The system deletes the stored baseline analysis if one of the following condi-tions is met.
› The vehicle is stopped and the ignition is turned off.
› The vehicle is stopped, the seat belt is taken off and the driver's door is opened.
› The vehicle is stopped for more than 15 minutes.
If none of these conditions is met or the driving style is not changed, the system
recommends a driving break again after 15 minutes.
The system can be activated/deactivated in the Infotainment » operating instruc-
tions for Infotainment , chapter Vehicle settings (CAR button) .
Information messages
First read and observe the introductory information and safety warn-
ings
on page 168.
The icon appears and the following message for a few seconds in the display of the instrument cluster .
Driver alert. Take a break!
DRIVER ALERT TAKE A BREAK
An audible signal is also emitted.
168Driving
WARNING“Quick-charging” the vehicle battery is dangerous and requires a special
charger and specialist knowledge.
CAUTION
On vehicles with the START/STOP system, the pole terminal of the charger must
not be connected directly to the negative terminal of the vehicle battery, but only
to the engine earth » page 244, Jump-starting in vehicles with the START-STOP
system .
Note
We therefore recommend that vehicle batteries be rapid charged by a specialist
garage.
Replacing
First read and observe the introductory information and safety warn-
ings
on page 224.
When replacing a battery, the new vehicle battery must have the same capacity,
voltage, amperage and be the same size. Suitable vehicle battery types can be
purchased from a specialist garage.
We recommend having the battery replaced by a specialist garage, where the
new vehicle battery will be installed properly and the original battery will be dis-
posed of in accordance with national regulations.
Disconnecting and reconnecting
First read and observe the introductory information and safety warn-
ings
on page 224.
On disconnecting and reconnecting the vehicle battery, the following functions
are initially deactivated or are no longer able to operate fault-free:
OperationOperating measureElectrical power window (operational faults)» page 49Enter the radio/navigation system code num-
ber» Operating instructions for Info-
tainment Radio or » Operating
instructions for Infotainment
NavigationSetting the clock» page 14Data in the multifunction display are deleted» page 29
Note
We recommend having the vehicle checked by a specialist garage in order to en-
sure full functionality of all electrical systems.
Automatic load deactivation
First read and observe the introductory information and safety warn-ings
on page 224.
The vehicle voltage control unit automatically prevents the battery from discharg-
ing when the bettery is subjected to heavy loads. This manifests itself by the fol-
lowing.
› The idling speed is raised to allow the generator to deliver more electricity to
the electrical system.
› Where appropriate large convenience consumers, e.g. seat heaters, rear win-
dow heaters, have their power limited or in case of emergency shut off com-
pletely.
CAUTION
■ Despite such intervention by the vehicle electric system management, the vehi-
cle battery may be drained. For example, when the ignition is switched on a long
time with the engine turned off or the side or parking lights are turned on during longer parking.■
Consumers which are supplied via a 12 V socket can cause the vehicle battery to
discharge when the ignition is switched off.
Note
Driving comfort is not disrupted by any shutting off of consumers. Often the driv-
er is not aware of it having taken place.
227Inspecting and replenishing
