brake MERCEDES-BENZ S-CLASS CABRIOLET 2018 Owner's Guide

Requirements:RESP®must be activated, but not inter vening.
RThe driving speed is at least 15mp h
(20 km/h).
RThe transmission is in position h.
#Toactivate cruise control: pressrock er
switch 1up.
#Toactivate cruise control: pressrock er
switch 2up (SET/+) or down (SET/-).
#Remo veyour foot from the accelerator pedal.
The cur rent speed is stored and maintained
by theve hicle.
#To increase/reduce speed: pressrock er
switch 2up/down tothe pressure point.
The stored speed is increased or reduced by
1 mp h(1 km/h).
or
#Press rocker switch 2beyond the pressure
point.
The stored speed is increased or reduced by
5 mp h(1 0 km/h).
or
#Ac celerate theve hicle tothe desired speed.
#Press rocker switch 2up.
If cruise control is activated and Traf fic Sign
Assist has detected a speed restriction sign wi th
a maximum permissible speed and this is dis‐
pla yed in the instrument clus ter:
#To adopt the de tected speed: pressrocker
switch 3up.
The maximum permissible speed shown by
th e traf fic sign is stored and theve hicle
maintains this speed.
#To deactivate cruise control:
press rocker switch 3(CNCL) down.
When cruise control is deactivated:
RRo cker switch 2(SET/+) or (SET/-) sa ves
th e cur rently driven speed and theve hicle
maintains this speed.
RRo cker switch 3(RES) calls up the speed
last stored and theve hicle maintains this
speed.
#To deactivate cruise control: pressrock er
switch 1down.
% Ifyo u brake, deactivate ESP
®or if ESP®
inter venes, cruise control is deacti vated.
When youswit choff theve hicle, the last
speed stored is cleared.
Driving and parking 16
1

Active Di stance Assist DI STRONIC
Function of Active Di stance Assist
DI STRO NIC
Active Dis tance Assist DISTRONIC maintains the
set speed on free-flowing roads. If vehicles
ahead are de tected, the set dis tance is main‐
ta ined, if necessar y,unt ilth eve hicle comes toa
halt. The vehicle accelerates or brakes depend‐
ing on the dis tance totheve hicle in front and
th e set speed. Speed (in thera nge between
15 mp h(2 0 km/h) and 130mp h(210 km/h))
and the dis tance totheve hicle ahead are set
and sa ved on thesteering wheel. Other
features of Active Dis tance Assist
DISTRONIC:
RAd justs the driving style depending on the
selected drive program (fuel-saving, comfort‐
able or dynamic) (
→page 136)
RRe acts tostationary vehicles in urban speed
ra nges (e xcept bicycles and mo torcyc les) if
conditions are suf ficient toenable de tection.
It also does not de tect pedestrians.
RInitiates rapid acceleration tothestored
speed, if the turn signal indicator is switched
on tochange totheove rtaking lane.
RTa ke s one-sided overtaking restrictions into
account on highw ays or on multi-lane roads
with separate roadw ays.
Ve hicles with Active Parking Assis t:ifth eve hicle
has been braked toast andstill on a multi-lane,
separate roadw ay by Active Dis tance Assist
DISTRONIC, it can au tomatical lyfollow th
eve hi‐
cle in front driving off again within 30 seconds. If
a crit

ical situation is de tected when driving off, a
visual and acoustic warning is given indicating
th at the driver must now take control of theve hi‐
cle. The vehicle is not accelerated any fur ther. Ac
tive Dis tance Assist DISTRONIC is only an aid.
The driver is responsible forke eping a safe dis‐
ta nce totheve hicle in front, forve hicle speed
and for braking in good time.
Sy stem limitations
The sy stem may be impaired or may not function
in thefo llowing ins tances, forex ample:
RIn snow ,ra in, fog, heavy spr ay, if there is
gl are, in direct sunlight or in greatly varying
ambient light.
RThe windshield in the area of the camera is
dirty, fogged up, damaged or co vered.
RIfth era dar sensors are dirty or co vered.
ROn slippery roads, braking or accelerating
can cause the drive wheels tolose traction
and theve hicle could then skid.
RIn parking garage s or on roads with steep
uphill or downhill gradients.
Do not use Active Dis tance Assist DISTRONIC in
th ese situations.
16 2
Driving and pa rking

&WARNING Risk of accident from acceler‐
ation or braking byActive Dis tance
Assist DISTRONIC
Ac tive Dis tance Assist DISTRONIC may accel‐
erate or brake in thefo llowing cases, for
ex ample:
RIfth eve hicle pulls away using Active Dis‐
ta nce Assist DISTRONIC.
RIfth estored speed is called up and is
considerably faster or slo werth an the
cur rently driven speed.
RIfAc tive Dis tance Assist DISTRONIC no
longer de tects a vehicle in front or does
not react toreleva nt objects.
#Alw ays carefully obser vethe traf fic con‐
ditions and be ready tobrake at all
times.
#Ta ke into account the tra ffic situation
before calling up thestored speed.
&
WARNING Risk of accident due toinsuf‐
fi cient decele ration byActive Dis tance
Assist DISTRONIC
Ac tive Dis tance Assist DISTRONIC brakes
yo ur vehicle with up to50 % of the maximum
possible deceleration. If this decele ration is
not suff icient,Active Dis tance Assist
DISTRONIC alerts you with a visual and
acoustic warning.
#In these cases, adjust your speed and
ke ep a suf ficient dist ance.
#Braketheve hicle yourself and/or take
ev asive action.
&
WARNING Risk of accident if de tection
function of Active Dis tance Assist
DISTRONIC is impaire d
Ac tive Dis tance Assist DISTRONIC does not
re act or only pa rtially reacts:
RWhen driving on a dif fere nt line tothe
ve hicle ahead or changing lane.
RTo pedestrians, animals, bicycles or
mo tor bikes, stationary vehicles or unex‐
pected obs tacles.
RTo complex traffic situations.
RTo oncoming vehicles and crossing traf‐
fi c.
Ac tive Dis tance Assist DISTRONIC can nei‐
th er give warnings nor inter vene in such sit‐
uations.
#Alw ays obser vethe tra ffic conditions
carefully and react accordingl y.
OperatingActive Di stance Assist DI STRO NIC
Re quirements:
RThe vehicle has been star ted.
RThe elect ric park ing brake is released.
RESP®is activated and is not inter vening.
RThe transmission is in position h.
RAllthe doors are closed.
RCheck of thera dar sensor sy stem success‐
fully comple ted (vehicle tra veling fasterthan
12 mp h (20 km/h)).
Driving and parking 16
3

#Toactivate/deacti vate Active Di stance
Assist DI STRO NIC: press button 1.
#Toactivate Active Di stance Assist
DI STRO NIC:press rock er switch 3up (SET
+) or down (SET-), or press rocker switch 4
up. Remo veyour foot from the accelerator
pedal.
The cur rent speed is stored and maintained
by theve hicle. or
#To
activate Active Di stance Assist
DI STRO NIC with a stored speed: press
rock er switch 4up. Remo veyour foot from
th e accelerator pedal.
% Ifrock er switch 4is pressed up twice while
driving, Active Dis tance Assist DISTRONIC is
acti vated with the speed restriction dis‐
play ed in the instrument clus ter.
#To accept the displa yed speed restriction
when Active Di stance Assist DI STRONIC
is active: pressrocker switch 4(RES) up.
The speed limit displa yed in the instrument
clus ter is ado pted as thestored speed. The
ve hicle adapts its speed tothat of theve hicle
in front, but only up tothestored speed.
#To pull away wit hDistance Assis t
DISTRONIC activated: remo veyour foot
from the brake pedal.
#Press rocker switch 4(RES) up.
or
#Depress the accelerator pedal briefly and dis‐
tinctl y.
The functions of Active Dis tance Assist
DISTRONIC continue tobe car ried out.
&
WARNING Risk of accident due toActive
Dis tance Assist DISTRONIC still being
activated when you lea vethe driver's
seat
If yo u lea vethe driver's seat while theve hicle
is being braked byActive Dis tance Assist
DISTRONIC only, theve hicle can rollaw ay.
#Alw ays deactivate Active Dis tance
Assist DISTRONIC and secure theve hi‐
cle topreve nt it from rolling away
before you lea vethe driver's seat.
#To deactivate Active Di stance Assist
DI STRO NIC:press rock er switch 4(CNCL)
down.
#To increase/reduce speed: pressrock er
switch 3up/down tothe pressure point.
The stored speed is increased or reduced by
1 mp h(1 km/h).
16 4
Driving and pa rking

System limitations
Te mp orary speed restrictions (e.g. for a cer tain
time or due towe ather conditions) cannot be
proper lyde tected bythe sy stem. The maximum
permissible speed applying for a vehicle with a
trailer is not de tected bythe sy stem. In these sit‐
uations you must adjust your speed yourself.
&
WARNING Risk of accident due toActive
Speed Limit Assi stadapting theve hicle's
speed
The speed adop tedby Active Speed Limit
Assi stmay be too high or incor rect in some
individual cases, such as:
RInthewe t or in fog
RWhen towing a trailer
#Ensure that the driven speed complies
with traf fic re gulations.
#Ad just the driving speed tosuit cur rent
traf fic and weather conditions.
Function of route-based speed adaptation
%
The availability of thefo llowing function is
countr y-dependent.
When Dis tance Assist DISTRONIC is acti ve,th e
function adju ststh e speed depending on the
ro ute events ahead. Depending on the drive pro‐
gram selected, theve hicle negotiates thero ute
eve nt ahead in a fuel-s aving, com fortable or
dynamic manner. When thero ute event has been
passed, theve hicle accelerates again tothe
st ored speed. The set dis tancetotheve hicle
ahead, vehicles de tected ahead and speed
re strictions ahead are take n into account.
Ro ute-based speed adjustment can byconfig‐
ured in the multimedia sy stem (
→page 167).
Ro ute events ahead are:
RBends
RT-intersection, traf fic circles and tollst ations
RTu rns and exits
% When theto llst ation is reached, Active Dis‐
ta nce Assist DISTRONIC adopts the speed as
th estored speed. Also,
the speed is reduced if the turn signal to
ch ange lanes is switch ed on and one ofthefo l‐
lowing situations is de tected:
RTu rning off at intersections
ROn slowing-down lanes
ROn lanes adjacent toslowing-down lanes
The driver is responsible forch oosing theright
speed and observing other road users. This
applies in particular tointersections, traf fic cir‐
cles and sets of traf fic lights, as route-based
speed adap tati

on does not brake theve hicle toa
st andstill.
When route guidance isactive, thefirs t speed
adjustment is car ried out automatically. If the
turn signal indica tor is switched on, the selected
ro ute isconfirmed and fur ther speed adjustment
is activated.
Speed adjustment is canceled in thefo llowing
cases:
RIf th e turn signal indicator is switched off
before thero ute event.
RIfth e driver depresses the accelera tor or
brake pedal during the process.
16 6
Driving and pa rking

Lane Change Assist cannotthen assist you
by applying steering torques .
#Always monitor the lane change and
ke ep your hands onthesteering wheel.
Obser vethe tra ffic conditions and steer
and/or brake if necessar y.
System limitations
The sy stem limitations of Active Steering Assist
apply toActive Lane Change Assi st
(
→page 167).
Ac tivating/deactivating Active Lane Change
Assi st
Multimedia sy stem:
,Vehicle.k Assistance
#Select Lane Change Assist .
#Activate Oor deacti vate ª the function.
Fu nction of Active Eme rgency Stop Assist
If th e driver continues toigno rethere peated
acoustic warning toput their hands on thesteer‐
ing wheel, Active Dis tance Assist DISTRONIC
re duces the speed. If the driver still does not
re spond, theBeginning Emergency Stop mes‐sage is shown in
the multifunction displa y.The
ve hicle is decelerated in stages toast andstill. At
speeds below 40 mph(6 0 km/h) the hazard
wa rning lights switch on automaticall y.
When theve hicle is stationar y,thefo llowing
actions are car ried out:
RThe vehicle is secured with the electric park‐
ing brake.
RAc tive Dis tance Assist DISTRONIC is ended.
RThevehicle is unloc ked.
RIf possible, an emer gency call is placed to
th e Mercedes-Benz emer gency call center.
The driver can cancel the deceleration at any
time byper form ing one of thefo llowing actions:
RSt eering
RDepressing the brake or accelera tor pedal
RPressing a steering wheel button or operat‐
ing Touch Control
RAc tivating or deacti vating Active Dis tance
Assist DISTRONIC
Overview ofActive Di stance Assist
DI STRO NIC displa ysinthe instrument clus‐
te r
The assis tance graphic and thest atus display
show thest atus of thefo llowing functions in the
instrument clus ter:
RAc tive Dis tance Assist DISTRONIC
RRoute-based speed adap tation
RAc tive Steering Assist
Driving and parking 17
1

Active Steering Assist status display
1Gr ay steering wheel: Active Steering Assist
switched on and passive
2Green steering wheel: Active Steering Assist
switched on and active
3Ye llow steering wheel flashing: transition
from active topassive status (sy stem limita‐
tion de tected or prom pttothe driver to
actively con firm )
During the transition from the active topassive
st atus, symbol 3is shown as enlar ged and
fl ashes yello w. Once the sy stem is passive, sym‐
bol 1is shown as gr ayinthe multifunction dis‐
pla y.
Information on Hill Start Assist
Hill Start Assist holds theve hicle for a short
time when pulling away on a hill under thefo l‐
lowing conditions:
RThe transmission is in position hork.
RThe elect ric park ing brake is released.
This gives you enough time tomo veyour foot
from the brake pedal tothe accelera tor pedal
and depress it before theve hicle begins toroll.
&
WARNING Risk of accident and injury
caused bytheve hicle rolling away
Af ter a short time, Hill Start Assist no longe r
holds theve hicle and it can rollaw ay.
#Therefore, swiftly mo veyour foot from
th e brake pedal tothe accelerator
pedal. Ne ver attem pttolea vetheve hi‐
cle if it is being held byHill Start Assist.
HOLD function
HOLD function
The HOLD function holds theve hicle at a stand‐
st ill without requ iring youto depress the brake
pedal, e.g. when pulling away uphill.
Sy stem limitations
The HOLD function is only intended toprov ide
assis tance when driving and is not a suff icient
means of safeguarding theve hicle against rolling
aw ay when stationar y.
RThe incline must not be greater than 30%.
Ac tivating/deactivating the HOLD function
&
WARNING Risk of an accident due tothe
HOLD function being activated when you
lea vetheve hicle
If yo u lea vetheve hicle while only the HOLD
function is braking theve hicle, theve hicle
can rollaw ay inthefo llowing situations:
RIf th ere is a malfunction in the sy stem or
in the po wer supply.
Driving and parking 17
3

RIfth e HOLD function is deactivated by
depressing the accelera tor pedal or the
brake pedal, e.g. byave hicle occupant.
RIfth e electrics in the engine compart‐
ment, the battery or the fuses are tam‐
pered with or if the battery is disconnec‐
te d.
#Alw ays deactivate the HOLD function
and secure theve hicle against rolling
aw ay before leaving theve hicle.
* NO
TEDama gefrom au tomatic braking
When Active Brake Assi st,Ac tive Dis tance
Assist DISTRONIC or the HOLD function are
activated, theve hicle brakes autonomously
in cer tain situations.
To avo id damage totheve hicle, deactivate
th ese sy stems in thefo llowing or similar sit‐
uations:
#During towing
#In a car wash
Requirements:RThe vehicle is stationar y.
RThe driver's door is closed or the seat belt on
th e driver's side is fastened.
RThe engine is running or has been au tomati‐
cally switched off bythe ECO start/ stop
function.
RThe electric parking brake is released.
RAc tive Dis tance Assist DISTRONIC is deacti‐
va ted.
RThe transmission is in position h,kori.
Ac tivating the HOLD function
#Dep ress the brake pedal and af ter a short
time quickly depress fur ther until theë
display appears in the multifunction displa y.
#Release the brake pedal.
Deactivating the HOLD function
#Depress the accelerator pedal topull away.
or
#Depress the brake pedal until theë dis‐
play disappears from the multifunction dis‐
pla y. The HOLD function is deactivated in
thefo llow‐
ing situations:
RAc tive Dis tance Assist DISTRONIC is acti va‐
te d.
RThe transmission is switched toposition j.
RThevehicle is secured with the electric park‐
ing brake.
In thefo llowing situations, theve hicle is held by
th e transmission position jorby the electric
parking brake:
RThe seat belt is unfas tened and the driver's
door is opened.
RThe engine is switched off.
RThere is a malfunction in the sy stem or the
po we r supply is insuf ficient.
AIR BODY CONT ROL
AIR BODY CONT ROL function
AIR BODY CONTROL is an air suspension sy stem
with variable damping for impr oved driving com‐
fo rt. The all-round le vel control sy stem ensures
th e best possible suspension and const ant
174
Driving and pa rking

ROAD SURFA CE SCAN:
RMonitorsthero ad in front of theve hicle
using multifunction camera 1.
RIs active when one of drive programs A
(Comfort) or N(CURVE) is selected.
RDetects une venness in thero ad sur face, e.g.
bump s, before theve hicle drives overth em.
RRe duces chassis mo vements. Sy
stem limitations
RO AD SURFA CE SCAN can be impaired inthe
fo llowing situations or can stop functioning:
RIf th ero adw ayis insuf ficiently lit, e.g. at
night.
RIn sno w,rain, fog, heavy spr ay, if there is
gl are, in direct sunlight or in greatly varying
ambient light.
RIf th e windshield in the area of multifunction
camera 1is dirty, fogged up, damaged or
co vered.
RIfth ero ad sur face has no optic stru cture or
re flects light.
RIf th e dis tance totheve hicle in front is too
short.
RIf sections of thero ute ha veave ry small
ra dius of cur vature.
RDuring dynamic driving maneu vers, e.g. if
yo u accelerate or brake theve hicle sharpl y.
RAtspeeds below 5 mph (7 km/h) or abo ve
11 2mp h (180 km/h).
RIfth eve hicle is at a raised le vel or in drive
prog ram C (Sport) or B(Sport Plus). Obser
vethe no tes on cleaning the multifunction
camera (
→page 338).
Setting theve hicle le vel
&
WARNING Risk of accident because
ve hicle le vel is too high
If yo u drive at a higher vehicle le vel,th e driv‐
ing characteristics may be impaired due to
th e higher vehicle center of gr avity.
The vehicle can drift outwards, forex ample,
when steering or cornering.
#Alw aysch oose a vehicle le vel which is
suited tothe driving style and thero ad
sur face conditions.
&
WARNING Risk of entrapment from vehi‐
cle lo wering
When lo wering theve hicle, people could
become trapped if their limbs are between
th eve hicle body and the tires or underneath
th eve hicle.
#Make sure no one is underneath the
ve hicle or in the immediate vicinity of
18 0
Driving and pa rking

RYouappl yth e parking brake.
RYo u enga getransmission position j.
RESP®intervenes.
RYo u open the trunk lid.
Sy stem limitations
Objects located abo veor below the de tection
ra nge of Active Parking Assist are not de tected
when the parking space is being measured.
These are also not take n into account when the
parking maneuver is calculated, e.g. overhanging
loads, overhangs or loading ramp s of truc ksor
th e boundaries of parking spaces. In some cir‐
cums tances, Active Parking Assist may therefore
guide you into the parking space prematurely.
&
WARNING Risk of accident due to
objects located abo veor below the
de tection range of Active Parking Assist
If th ere are objects abo veor below the
de tection range, thefo llowing situations may
arise:
RAc tive Parking Assist may steer too early.
RVe hicles with automatic transmis‐
sion: Thevehicle may not stop in front of
th ese objects.
This could cause a collision.
#In these situations, do not use Active
Pa rking Assist.
Sn owfa ll or heavy rain may lead toa parking
space being measured inaccuratel y.Pa rking
spaces that are partial lyoccupied bytrailer
dr aw bars might not be identified as such or be
measured incor rectly. Only use Active Parking
Assist on le vel, high-grip ground.
Do no t useActive Parking Assist in thefo llowing
situations:
RIn extreme weather conditions such as ice,
pac ked snow or in heavy rain.
RIfyo u are transporting a load that pr otru des
be yond theve hicle.
RIfth e parking space is on a steep downhill or
uphill gradient.
RIf yo u ha veinstalled snow chains. Ac
tive Parking Assist may also display parking
spaces that are not suitable for parking, e.g.:
RPa rking spaces where parking is prohibited.
RPa rking spaces on unsuitable sur faces.
Ac tive Parking Assist will not assist youwit h
parking spaces at right angles tothe direction of
tr ave l in thefo llowing situations:
RIf two parking spaces are located immedi‐
ately next toeach other.
RIfth e parking space is directly next toa low
obs tacle such as a low curb.
Ac tive Parking Assist will not assist you with
parking spaces at right angles tothe direction of
tr ave l in thefo llowing situat ions:
RIf
th e parking space is on a curb.
RIfth e parking space is bordered byan obs ta‐
cle, e.g. a tree, a post or a traile r.
Driving and parking 19
1