ATTENTION ASSIST
Gene ral notes
ATTENTION ASSIST help syou during long,
monotonous journeys, suc has on highways. It is
active in th e37 mph (60 km/h) to 12 5mph
(20 0km/h) range. If ATTENTION ASSIST
detects typical indicators of fatigue or increas -
ing lapse sin concentration on th epart of th e
driver ,it suggest staking abreak.
Import ant safety notes
ATTENTION ASSIST is only an aid to th edriver .It
might no talways recogniz efatigue or increasing
inattentiveness in time or fail to recogniz ethem
at all. The system is no t asubstitut efor awell-
reste dand attentive driver .
The functionalit yof ATTENTION ASSIST is
restricted and warning smay be delaye dor no t
occur at all:
Rif th elengt hof th ejourney is less than approx -
imately 30 minute s
Rif theroad condition is poor ,e.g. if th esurfac e
is uneven or if there are pothole s
Rif there isastron gside win d
Rif you hav eadopted asport ydrivin gstyle wit h
high cornering speeds or high rates of accel-
eration
Rif you are predominantly drivin gslower than
37 mph (60 km/ h)or faster than 125 mph
(200 km/h)
Rif the time has been set incorrectly
Rin active driving situations, such as when you
change lanes or change your speed
The ATTENTION ASSIST tiredness assessment
is deleted and restarted when continuing the
journey, if:
Ryou switch off the engine
Ryou take off your seat belt and open the driv-
er's door, e.g. for a change of drivers or to
take a break
Displaying the attention level
You can have current status information dis-
played in the assistance menu (Ypage 160) of
the on-board computer.
XSelect the Assistance display for Attention
Assist using the on-board computer
(
Ypage 159).
The following information is displayed:
Rlength of the journey since the last break.
Rthe attention level determined by ATTENTION ASSIST (Attention Level), displayed in a
bar display in five levels from high to low
RIf ATTENTION ASSIST is unable to calculate
the attention level and cannot issue a warn-
ing, the System Suspended
message
appears. The bar display then changes the
display, e.g. if you are driving at a speed below
37 mph (60 km/h) or above 124 mph
(200 km/h).
Activating ATTENTION ASSIST
XActivate ATTENTION ASSIST using the on-
board computer (Ypage 160).
The system determines the attention level of
the driver depending on the setting selected:
Selection Standard
: the sensitivity with which
the system determines the attention level is set
to normal.
Selection Sensitive
: the sensitivity is set
higher. The attention level detected by Attention
Assist is adapted accordingly and the driver is
warned earlier.
When ATTENTION ASSIST is deactivated, the
é symbol appears in the multifunction dis-
play in the assistance graphic display.
When ATTENTION ASSIST has been deactivated,
it is automatically reactivated after the engine
has been stopped. The sensitivity selected cor-
146Driving systems
Driving and parking
Switching on Blind Spot Assist
XMake sure that Blind Spot Assist
(Ypage 160) is activated in the on-board
computer.
XSelect key position 2with the Start/Stop but-
ton.
Warning lamps :in the exterior mirrors light
up red for approximately 1.5 seconds and
then turn yellow.
Lane Keeping Assist
General notes
Lane Keeping Assist monitors the area in front of
your vehicle by means of multifunction cam-
era :which is attached behind the top of the
windshield. Active Lane Keeping Assist detects
lane markings on the road and can warn you
before you leave your lane unintentionally.
This function is available in the range between
40 mph and 120 mph (60 km/h and 200 km/h).
A warning may be given if a front wheel passes
over a lane marking. It will warn you by means of
intermittent vibration in the steering wheel for
up to 1.5 seconds.
Important safety notes
GWARNING
Lane Keeping Assist may not always clearly
recognize lane markings.
In this case, Lane Keeping Assist may:
Rgive an unnecessary warning
Rnot give a warning
There is a risk of an accident.
Always pay particular attention to the traffic
situation and stay in lane, in particular if
warned by Lane Keeping Assist.
GWARNING
The Lane Keeping Assist warning does not
return the vehicle to the original lane. There is
a risk of an accident.
You should always steer, brake or accelerate
yourself, in particular if warned by Lane Keep-
ing Assist.
If you fail to adapt your driving style, Lane Keep-
ing Assist can neither reduce the risk of an acci-
dent nor override the laws of physics. Lane
Keeping Assist cannot take into account the
road, traffic and weather conditions. Lane Keep- ing Assist is merely an aid. You are responsible
for the distance to the vehicle in front, for vehi-
cle speed, for braking in good time and for stay-
ing in your lane.
The Lane Keeping Assist does not keep the vehi-
cle in the lane.
The system may be impaired or may not function
if:
Rthere is poor visibility, e.g. due to insufficient
illumination of the road, or due to snow, rain,
fog or spray
Rthere is glare, e.g. from oncoming traffic, the
sun or reflections (e.g. when the road surface
is wet)
Rthe windshield is dirty, fogged up, damaged or
covered, for instance by a sticker, in the vicin-
ity of the camera
Rthere are no, several or unclear lane markings
for a lane, e.g. in areas with road construction
work
Rthe lane markings are worn away, dark or cov-
ered up, e.g. by dirt or snow
Rthe distance to the vehicle in front is too small and the lane markings thus cannot be detec-
ted
Rthe lane markings change quickly, e.g. lanes
branch off, cross one another or merge
Rthe road is narrow and winding
Rthere are strong shadows cast on the road
Switching on Lane Keeping Assist
XActivate Lane Keeping Assist using the on-
board computer; to do so, select Standardor
Adaptive(Ypage 161).
If you drive at speeds above 40 mph
(60 km/h) and lane markings are detected,
the lines in the assistance graphics display
Driving systems149
Driving and parking
Z
The coolant temperature display is in the lower
section of the tachometer (Ypage 30).
Under normal operating conditions and with the
specified coolant level, the coolant temperature
may rise to 248 ‡ (120 †).
Operating the on-board computer
:Multifunction display
;Right control panel
=Left control panel
XTo activate the on-board computer: set the
Start/Stop button to key position 1.
You can control the multifunction display and
the settings in the on-board computer using the
buttons on the multifunction steering wheel.
Left control panel
òROpens the menu list
9
:Press briefly:
RScrolls in lists
RSelects a menu or function
RIn the RadioorMediamenu:
opens the track or station list and
selects a station, an audio track or
a video scene
RIn the Telephonemenu: switches
to the phone book and selects a
name or a telephone number
9
:Press and hold:
RScrolls quickly through all lists
RIn the RadioorMediamenu:
selects a station, audio track or
video scene using rapid scrolling
RIn the Telephonemenu: starts
rapid scrolling if the phone book is
open
aRIn all menus: confirms the selected
entry in the list
RIn the RadioorMediamenu:
opens the list of available radio
sources or media
RIn the Telephonemenu: switches
to the phone book and starts dial-
ing the selected number
ñRSwitches off the Voice Control
System (see the separate operat-
ing instructions)
%Press briefly:
RBack
RIn the RadioorMediamenu: dese-
lects the track or station list or list
of available radio sources or media
RHides display messages
RExits the telephone book/redial
memory
%Press and hold:
RCalls up the standard display in the
Tripmenu
Right control panel
~RRejects or ends a call
RExits the telephone book/redial
memory
6RMakes or accepts a call
RSwitches to the redial memory
W
XRAdjusts the volume
8RMute
óRSwitches on the Voice Control Sys-
tem (see the separate operating
instructions)
152Displays and operation
On-board computer and displays
Multifunction display
:Transmission position (Ypage 111)
;Time
=outside temperature (Ypage 151)
?Display
AAdditional speedometer (Ypage 162)
Display panel ?shows the selected menu or
submenu and display messages.
The multifunction display shows the unit in addi-
tional speedometer Ainverse to the speedom-
eter unit in the instrument cluster.
XTo open the menu list: press theòbut-
ton on the steering wheel.
Display panel ?appears in the menu list.
Possible displays in the multifunction dis-
play:
R= PARKTRONIC (Ypage 139)
RCRUISECruise control (Ypage 127)
R_Adaptive Highbeam Assist (Ypage 88)
RèECO start/stop function (Ypage 105)
RëHOLD function (Ypage 136)
Menus and submenus
Menu overview
Press the òbutton on the steering wheel to
open the menu list.
Operating the on-board computer (
Ypage 152).
Depending on the vehicle equipment, you can
select the following menu:
RTripmenu (Ypage 153)
RNavimenu (navigation instructions)
(Ypage 154)
RRadiomenu (Ypage 156)
RMediamenu (Ypage 157)
RTelephonemenu (Ypage 158)
RAssistance Graphicmenu (Ypage 159)
RServicemenu (Ypage 160)
RSettingsmenu (Ypage 160)
RAMGmenu (Ypage 162)
Trip menu
Standard display
XPress and hold the %button on the steer-
ing wheel until the Tripmenu with trip odom-
eter :and odometer ;appears.
Calling up the range
XPress the òbutton on the steering wheel
to open the menu list.
XPress :or9 on the steering wheel to
select the Tripmenu.
XPress:or9 to select the approximate
Range.
The approximate range that can be covered
depends on the fuel level and your current
driving style. If there is only a small amount of
fuel left in the fuel tank, a vehicle being refu-
Menus and submenus153
On-board computer and displays
Z
Accepting a call
If someonecall syou when you are in th eTele‐phonemenu, adisplay message appear sin th e
multifunction display.
You can accept acall at any time, eve nif you are
no tin th eTelephone
menu.
XPress th e6 buttonon th esteering whee l
to accept an incoming call .
Rejectingorending a call
You can en dor rejec t acall at any time eve nif
you are no tin th eTelephonemenu.
XPress th e~ buttonon th esteering whee l
to rejec tor en d acall.
Selecting an entry in the phonebook
XPressòon thesteering whee lto open th e
men ulist .
XPress :or9 on thesteering whee lto
select th eTelephonemenu.
XConfir mby pressing aon thesteering
wheel.
XPress th e:, 9ora buttonto
switch to th ephone book .
XPress:or9 to select th enames on e
after th eother .
or
XTo star trapid scrolling: press and hold:
or 9 for longer than on esecond.
The names in th ephone book are displayed
quickl yon eafter th eother .
If you press and hold th e: or9 button
for longer than fiv eseconds, th enam e
appear swit hth enext or previous lette rinitial
lette rin th ealphabet .
Rapid scrollin gstops when you release th e
butto nor reac hth een dof th elist .
XIf only one telephone number is store dfor
a name: press th e6 ora buttonto
start dialing.
or
XIf there is mor ethan one number for a
particular name: press the6 ora
butto nto display th enumbers.
XPress th e: or9 buttonto select th e
number you want to dial.
XPress th e6 ora buttonto start dialing. or
XTo exit th
etelephone book :press th e~
or % button.
Redialing
The on-board computer saves th elast names or
number sdialed in th eredial memory.
XPress òon thesteering whee lto open th e
men ulist .
XPress :or9 on thesteering whee lto
select th eTelephonemenu.
XConfir mby pressing aon thesteering
wheel.
XPress th e6 buttonto switch to th eredial
memory.
XPress th e: or9 buttonto select th e
desired nam eor number .
XPress the6 ora buttonto start dialing.
or
XTo exit th eredial memory :press th e~
or % button.
Assistance graphic menu
XUseò on thesteering whee lto call up th e
list of menus.
XPress th e: or9 buttonon th esteering
whee lto select th eAssistanc eGraphi c
menu.
XConfirmby pressing aon thesteering
wheel.
The multifunction display shows th e
DISTRONI CPLU Sdistanc edisplay in th e
assistanc egraphic .
The assistanc egraphic displays th estatus of
and information from th efollowin gdrivin g
systems or drivin gsafet ysystems :
Menus and submenus159
On-board computer and displays
Z
RACETIMER
Displaying and starting RACETIMER
:Lap
;RACETIMER
The RACETIMER is only intended for use on a
closed race circuit. Do not use the function on
public roads.
You can start the RACETIMER when the engine is
running or if you select key position 2with the
Start/Stop button.
XUse ò on the steering wheel to call up the
list of menus.
XPress the :or9 button on the steering
wheel to select the AMGmenu.
XConfirm by pressing aon the steering
wheel.
XPress the :or9 button repeatedly
until the RACETIMER is shown.
XTo start: press the abutton to start the
RACETIMER.
Starting a new lap
:Lap
;RACETIMER
=Quickest lap time
XPress the :or9 button to select NewLap.
XPressato confirm.
A maximum of 32 laps may be stored.
Stopping the RACETIMER
XPress the :or9 button to select Stop.
XPressato confirm.
If you stop the vehicle and select key position 1
with the Start/Stop button, the RACETIMER
interrupts timing. If you select key position 3
with the Start/Stop button and then press a
Start
to confirm, timing is continued.
Continuing the RACETIMER
XPress the :or9 button to select Con‐tinue.
XPressato confirm.
164Menus and submenus
On-board computer and displays
Display messagesPossible causes/consequences andMSolutions
The yellow!warning lamp lights up and th ered F (USAonly)
or ! (Canada only) indicator lamp flashes .
It is no tpossibl eto apply th eelectric parking brak emanually.
XShift th etransmission to position P.
XVisitaqualified specialist workshop .
$(USA
only)
J( Canada
only)
Check Brake Fluid
Level
There is no tenough brak efluid in th ebrak efluid reservoir .
In addition ,th e$ (USAonly) or J(Canada only) warning lamp
lights up in th einstrumen tcluste rand awarning tone sounds.
GWARNIN G
The braking effec tmay be impaired.
There is aris kof an accident.
XPull ove rand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions. Do no tcontinu edrivin g
under any circumstances.
XSecur eth evehicl eagainst rollin gaway (Ypage 119).
XConsult aqualified specialist workshop .
XDo notadd brak efluid .This does no tcorrec tth emalfunction .
#
CheckBrakePadWear
The brak epads/linings hav ereached their wear limit.
US Aonly: th ered $ brakesystem warning lamp also lights up while
th eengin eis running.
XVisit aqualified specialist workshop .
G
Inoperative
Oneor mor emain features of th embrace system are malfunctioning .
XHaveth embrace system checke dimmediately at aqualified spe -
cialist workshop .
Collision Preven ‐tionAssist Plu sCurrently Unavaila‐ble See Operator' sManual
COLLISION PREVENTION ASSIST PLU Sis temporarily no toperational.
Possibl ecauses are:
Rth eradar sensor system is temporarily inoperative, e.g. due to elec -
tromagneti cradiation emitted by nearby TV or radi ostation sor
other source sof electromagneti cradiation .
Rthesystem is outside th eoperating temperature range.
Rth eon-boar dvoltag eis to olow.
Whe nth ecauses state dabov eno longer apply, th edisplay message
disappears.
COLLISION PREVENTION ASSIST PLU Sis operational again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 119).
XRestart th eengine.
172Display messages
On-board computer and displays
Display messagesPossible causes/consequences andMSolutions
Collision Preven‐tionAssist Plu sInoperative
COLLISION PREVENTION ASSIST PLU Sis temporarily inoperative due
to amalfunction .Adaptive Brake Assis tmay also hav efailed.
XVisit aqualified specialist workshop immediately.
PRE-SAFE Inopera‐tiv eSeeOperator' sManual
Importantfunction sof PRE-SAF E®havefailed. Al lother occupant
safet ysystems ,e.g. air bags ,remain available.
XVisit aqualified specialist workshop immediately.
RadarSensor sDirtySee Operator' sMan ‐ual
At least on eof th efollowin gdrivin gsystems or drivin gsafet ysystems
is temporarily restricted or inoperative:
RCOLLISION PREVENTION ASSIST PLU S
Possibl ecauses are:
Rth esensor sin th eradiato rtrim and/o rin th ebumpers are dirty
Rth efunction of th edrivin gsystem or drivin gsafet ysystem is
impaire ddue to heav yrain or snow
A warning tone also sounds.
Whe nth ecauses state dabov eno longer apply, th edisplay message
disappears. Al ldrivin gsystems or drivin gsafet ysystems are operative
again .
If th edisplay message does no tdisappear :
XPull overand stop th evehicl esafely as soo nas possible, payin g
attention to roa dand traffic conditions.
XSecur eth evehicl eagainst rollin gaway (Ypage 119).
XSwitchoff th eengine.
XClean th esensor sin th efollowin glocation s (Ypage 237):
Rin theradiato rtrim
Rin th efron tbumper
Rin th erear bumper, particularly in th emiddle of th erear bumper
XRestart th eengine.
The display message disappears.
6
SRSMalfunctionSer ‐viceRequired
The restrain tsystem is faulty. The 6warning lamp also lights up in
th einstrumen tcluster.
GWARNIN G
The air bags or Emergency Tensioning Devices may either be triggered
unintentionally or, in th eevent of an accident, may no tbe triggered .
There is an increased ris kof injury.
XVisit aqualified specialist workshop immediately.
Fo rfurther information about th erestrain tsystem, see (
Ypage 35).
Display messages173
On-board computer and displays
Z