
No lane-correcting brake application occurs if: R
you clearly and actively steer, brake or accel-
erate. R
you cut the corner on a sharp bend. R
you have switched on the turn signal. R
a driving safety system intervenes, e.g. ESP ®
,
PRE-SAFE ®
Brake or Active Blind Spot Assist.R
you have adopted a sporty driving style with
high cornering speeds or high rates of accel-
eration. R
ESP ®
is switched off.R
the transmission is not in position D .R
a loss of tire pressure or a defective tire has
been detected and displayed. R
an obstacle in the lane in which you are driving
has been detected.
Active Lane Keeping Assist may not detect other
road users or traffic situations. An inappropriate
brake application may be interrupted at any time
if you: R
steer slightly in the opposite direction R
switch on the turn signal R
clearly brake or accelerate
A lane-correcting brake application is interrup-
ted automatically if: R
a driving safety system intervenes, e.g. ESP ®
,
PRE-SAFE ®
Brake or Active Blind Spot Assist.R
lane markings can no longer be recognized.
Switching on Active Lane Keeping Assist
X
Press button D .
Indicator lamp C lights up. The Lane Keep‐
ing Assist On message appears in the mul-
tifunction display. If all conditions have been
satisfied, a warning or steering intervention
may be made.
If you drive at speeds above 40 mph
(60 km/h) and lane markings are detected, the lines in the assistance graphics display
( Y
page 268) are shown in green. Active Lane
Keeping Assist is ready for use. X
To switch off: press button D .
Indicator lamp C goes out. The Active Lane
Keeping Assist is deactivated. The Lane
Keeping Assist Off message appears in
the multifunction display.
Selecting Standard or Adaptive setting X
In the DriveAssist menu on the on-board
computer, select the Active Lane Keep‐
ing Assist function ( Y
page 271).X
Select Standard or Adaptive .
When Standard is selected, no warning vibra-
tion occurs if: R
you switch on the turn signals. In this event,
the warnings are suppressed for a certain
period of time. R
a driving safety system intervenes, such as
ABS, BAS or ESP ®
.
When Adaptive
is selected, no warning vibra-
tion occurs if: R
you switch on the turn signals. In this event,
the warnings are suppressed for a certain
period of time. R
a driving safety system intervenes, e.g.
ABS, BAS or ESP ®
. R
you accelerate hard, e.g. kickdown. R
you brake hard. R
you steer actively, e.g. swerve to avoid an
obstacle or change lanes quickly. R
you cut the corner on a sharp bend.
In order that you are warned only when neces-
sary and in good time if you cross the lane mark-
ing, the system recognizes certain conditions
and warns you accordingly.
The warning vibration occurs earlier if: R
you approach the outer lane marking on a
bend. R
the road has very wide lanes, e.g. a highway. R
the system recognizes solid lane markings.
The warning vibration occurs later if: R
the road has narrow lanes R
you cut the corner on a bendDriving systems 239
Driving and parking Z

Aut oma tic engine startThe automatically switched-off internal combus -
tio n engin e start s automatically in certai n situa-
tions , if:R
th e power demand from th e driver via th e
accelerato r pedal is greate r than th e electric
motor alon e can provideR
th e driver switches to driv e program S or MR
th e condition of charge of th e high-voltage
battery has reached th e lower limitR
th e settings of th e automatic climat e control
require it, e.g. at external temperatures abov e
30 †
Over ru n mod eIn overrun mode, th e combustio n engin e is
switched off and is disconnected from th e driv e
train. The electric motor: R
generates low thrust , whic h correspond s to
th e overrun mod e of an active combustio n
engin eR
function s as a generator and produce s th e
necessary energ y for th e auxiliary consumer s
and charge s th e high-voltage battery
Ove rrun mod e is possible in th e followin g spee d
range: R
in driv e program E below 81 mph (13 0 km/h)R
in driv e program E+ below 11 2 mph
(18 0 km/h)
In driv e program E+ , after th e accelerato r pedal
has been released th e coasting characteristic s
of th e vehicl e are adapted to th e traffic condi-
tions . Further information about th e haptic
accelerato r p edal ( Y
page 251).
Route-based operating strategy Fo r th e route-based operating strategy, th e sys-
te m factors in information about th e expecte d
rout e when rout e guidance is active.
The information on th e rout e is provide d by th e
multimedia system and includes th e following:R
road categories R
spee d limitation sR
dat a on downhill gradients The use of electric energ y is automatically opti-
mally distributed from th e beginnin g to th e en d
of th e journey, usin g information about th e
route. The distribution is pre-emptive and takes
int o consideration : R
th e sections of th e journey aheadR
th e energ y consumption on th e whole rout e
The condition of charge of th e high-voltage bat -
tery is thus systematically controlled. In addi-
tion, th e control function takes int o accoun t
that: R
th e fuel saving s throug h th e use of electrical
energ y can vary, depending on th e rout e (e.g.
urban , interurban or highway) R
th e use of electrical energ y is held available in
particular for electric operation (e.g. urban
routes)
The vehicl e thus automatically select s th e opti-
mum driving mod e for th e respectiv e sectio n of
th e route.
The route-based operating strategy is available
under th e followin g conditions: R
driv e program E+ is selected R
HYBRID driving mod e is selectedR
active rout e g uidance is activated R
suitable map dat a is available
When th e route-based operating strategy is
bein g used, th e area in fron t of th e vehicl e is
shown as green in th e multifunction display.
Parking X
Apply th e electric parking brake.
The red $ indicator lamp in th e instrumen t
cluste r light s up. X
Use th e DIRECT SELECT leve r to shif t th e
automatic transmission to P .X
Switch th e ignition off .
The READY indicator in th e instrumen t cluste r
goes out .
Further information on parking and switching off
th e internal combustio n engin e ( Y
page 190).PLUG ‑ IN HYBRID operation 253
Driving and parking Z

G WARNING
If you deactivate ESP ®
, ESP ®
no longer sta-
bilizes the vehicle. There is an increased risk
of skidding and an accident.
Only deactivate ESP ®
in the situations descri-
bed in the following.
It may be best to deactivate ESP ®
in the follow-
ing situations: R
when using snow chains R
in deep snow R
on sand or gravel
For further information about ESP ®
, see
( Y
page 73). X
Start the engine. X
Press the