Activating
and
deactivating the start/stop
system
manually
•
Press
the
0
button in the centre
console
~
F
ig.
146.
•
If the
start/stop
system
has been
deactivated,
the
indicator
lamp
in the
button
lights
up.
The engine will start if
the vehicle is
in
stop mode
when
the
system
is deactivated
manually.
Start/stop mode when adaptive cruise
control (ACC) is active
The
engine
will be switched off after the adaptive
cruise
control
(ACC) has brought the vehicle
to
a
standstill with an active braking intervention
~
page
226.
In the
following
instances,
the
engine will
restart
when
the ACC
is
active:
•
If
the accelerator is depressed.
•
When the
ACC has
resumed speed and
dis-
tance control.
•
If the vehicle ahead
has moved
on.
The brake servo and the electromechanical
steering will not function if the engine is
switched
off.
• Never allow the vehicle to roll
if
the engine
is
switched off.
• The start/stop system must be deactivated
if
work is to be carried out
in
the engine com-
partment.
Downhill driving assistant
rf'n
First read and observe the
introductory
~
information and safety warnings
£
on
page 196.
The downhill driving assistant in
vehicles
with
an
~utomatic
gearbox helps when braking and travel-
ling downhill
~
£
.
The downhill
driving
assistant
uses
the
braking power
of the
engine.
The automatic gearbox selects
the best
gear
for
t~e
circumstances
by
taking the
steepness of
the
h1l.l and the current speed
into
consideration.
To do
th1s
the
selector
lever must be in
position
D or
S.
The downhill driving assistant is
not
active
in
Tip-
Ironic
mode.
As
the downhill
driving
assistant
can only shift
down
as
far
as
the
3rd
gear,
it
may
be necessary
to activate
the
Tiptronic
mode
when
driving
down
If the
start/stop system is used
in
very
high
outside temperatures over
a
long
period, the
vehicle battery can
be
damaged.
m
In
some
cases, it
may
be necessary to
restart
L!J
the
engine
manually.
Follow any correspond-
ing
messages
on
the
instrument
cluster
display.
m
The
start/stop system
is
automatically
activa-
L!J
ted when the
Eco
driving
mode is
selected in
vehicles that
have
Driving
Mode
Selection
~
page
248.
<l
particularly
steep
inclines.
When
in
Tiptronic
mode,
select
the 2nd
or
1st
gear manually in order
to
make use
of
the braking
effect of
the
engine and
to
relieve the
brakes.
Activating the downhill driving assistant
automatically:
•
If the
incline is
greater than
approximately
6%.
•
AND:
if the selector
lever
is in position
0
or
s.
•
In addition, if the CCS or ACC is switched
off:
if
the
vehicle speed
is
less
than
approximately
80 km/h (50 mph)
or the brake
pedal is
depressed.
•
In addition if the CCS or ACC is active:
if the
stored
speed
is
exceeded.
Driver assist systems
199
..