computer MERCEDES-BENZ C-Class SEDAN 2012 W204 Owner's Guide

Active Lane Keeping Assist
Important safety notes
Active Lane Keeping Assist monitors the area
in front of your vehicle by means of a camera
at the top of the windshield. Active Lane
Keeping Assist detects lane markings on the
road and warns you before you leave your
lane unintentionally. If you do not react to the
warning, a lane-correcting application of the
brakes can bring the vehicle back into the
original lane.
:Active Lane Keeping Assist camera
If you have selected the Display Unit
Speed-/Odometer (Y page 206) function in
the on-board computer and select km as the
unit of measurement, Active Lane Keeping
Assist is active from speeds of 60 km/h. If
the miles display unit is selected, the
assistance range begins at 40 mph.
GWARNING
Active Lane Keeping Assist does not keep
your vehicle in its lane. It is only an aid and
may detect the lane markings on the road
incorrectly or not at all.
The system may be impaired or may not
function if:
R several or no lane markings for a single lane
are present.
R there is poor visibility, e.g. due to
insufficient illumination of the road, or due
to snow, rain, fog or spray.
R there is glare, e.g. from oncoming traffic,
the sun, or reflection from other vehicles.
R the windshield is dirty, fogged up or
covered, for instance by a sticker, in the
vicinity of the camera.
R the lane markings are worn away, dark or
covered up, e.g. by dirt or snow.
R the distance to the vehicle in front is too
small and the lane markings thus cannot be
detected.
R the lane markings on the road are unclear,
e.g. near roadworks.
R the lane markings change quickly, e.g.
lanes branch off, cross one another or
merge.
R the road is narrow and winding.
Active Lane Keeping Assist cannot detect
road and traffic conditions. It is not a
substitute for attentive driving. You are
responsible for the vehicle's speed, braking in
good time, and steering correctly. Always
adapt your driving style to suit the prevailing
road and weather conditions. Always pay
attention to traffic conditions and your
surroundings. Otherwise, you may fail to
recognize dangers in time, cause an accident
and injure yourself and others.
Warning vibration in the steering wheel
A warning can be given when a front wheel
passes over a lane marking. You will be
warned by means of intermittent vibration in
the steering wheel for up to 1.5 seconds.
In order that you are warned only when
necessary and in good time if you cross the
lane marking, 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
freeway.
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 bend.190Driving systemsDriving and parking

Active Lane Keeping Assist does not detect
traffic situations or road users. An
inappropriate brake application may be
interrupted at any time if you:
R steer slightly in the opposite direction.
R use a turn signal.
R clearly brake or accelerate.
A lane-correcting brake application is
interrupted 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 AssistXSwitch on Active Lane Keeping Assist using
the on-board computer ( Y page 205).
Symbol : appears in the multifunction
display.
If your speed exceeds 40 mph (60 km/h)
and lane markings are detected,
symbol : is shown in green. Active Lane
Keeping Assist is ready for use.192Driving systemsDriving and parking

Useful information ............................194
Important safety notes ....................194
Displays and operation ....................194
Menus and submenus ......................198
Display messages ............................. 213
Warning and indicator lamps in the
instrument cluster ............................239193On-board computer and displays

Useful information
i This Operator's Manual describes all
models and all standard and optional
equipment of your vehicle available at the
time of publication of the Operator's
Manual. Country-specific differences are
possible. Please note that your vehicle may
not be equipped with all features
described. This also applies to safety-
related systems and functions.
i Please read the information on qualified
specialist workshops ( Y page 24).
Important safety notes
You will find an illustration of the instrument
cluster in the "At a glance" section
( Y page 29).
GWARNING
A driver's attention to the road and traffic
conditions must always be his/her primary
focus when driving.
For your safety and the safety of others,
selecting features through the multifunction
steering wheel should only be done by the
driver when traffic and road conditions permit
it to be done safely.
Bear in mind that at a speed of just 30 mph
(approximately 50 km/h ), your vehicle is
covering a distance of 44 feet (approximately
14 m) every second.
GWARNING
No messages will be displayed if either the
instrument cluster or the multifunction
display is inoperative.
As a result, you will not be able to see
information about your driving conditions,
such as
R speed
R outside temperature
R warning/indicator lamps
Rmalfunction/warning messages
R failure of any systems
Driving characteristics may be impaired.
If you must continue to drive, do so with added
caution. Contact an authorized Mercedes-
Benz Center as soon as possible.GWARNING
Malfunction and warning messages are only
indicated for certain systems and are
intentionally not very detailed. The
malfunction and warning messages are
simply a reminder with respect to the
operation of certain systems. They do not
replace the owner's and/or driver's
responsibility to maintain the vehicle's
operating safety. Have all required
maintenance and safety checks performed on
the vehicle. Bring the vehicle to an authorized
Mercedes-Benz Center to address the
malfunction and warning messages.
Displays and operation
Coolant temperature display
GWARNING
Driving when your engine is overheated can
cause some fluids which may have leaked into
the engine compartment to catch fire. You
could be seriously burned.
Steam from an overheated engine can cause
serious burns which can occur just by opening
the engine hood. Stay away from the engine
if you see or hear steam coming from it.
Stop the vehicle in a safe location away from
other traffic. Turn off the engine, get out of the
vehicle and do not stand near the vehicle until
the engine has cooled down.
The coolant temperature gauge is in the
instrument cluster on the left-hand side.
Under normal operating conditions and with
the specified coolant level, the coolant
temperature may rise to 248 ‡ (120 †).
194Displays and operationOn-board computer and displays

! If the coolant temperature is too high a
display message is shown.
If the coolant temperature rises above
248 ‡(120 †), do not drive any further as
this could damage the engine.
Tachometer
The red band in the tachometer indicates the
engine's overrevving range.
! Do not drive in the overrevving range, as
this could damage the engine.
The fuel supply is interrupted to protect the
engine when the red band is reached.
Outside temperature display
The outside temperature display is in the
multifunction display ( Y page 196).
GWARNING
The outside temperature indicator is not
designed to serve as an ice-warning device
and is therefore unsuitable for that purpose.
Indicated temperatures just above the
freezing point do not guarantee that the road
surface is free of ice. The road may still be icy,
especially in wooded areas or on bridges.
Changes in the outside temperature are
displayed after a short delay.
Speedometer with segments
The segments in the speedometer indicate
which speed range is available.
Cruise control ( Y page 159) activated:
The segments light up from the stored speed
to the maximum speed.
DISTRONIC PLUS ( Y page 161) activated:
One or two segments in the set speed range
light up.
DISTRONIC PLUS detects a vehicle in front:
The segments between the speed of the
vehicle in front and the stored speed light up.
Operating the on-board computer
Overview
The on-board computer is activated as soon
as you turn the SmartKey to position 1 in the
ignition lock.
You can control the multifunction display and
the settings in the on-board computer using
the buttons on the multifunction steering
wheel.
:Multifunction display;To switch on the Voice Control System;
see the separate operating instructions=Right control panel?Left control panelABack buttonDisplays and operation195On-board computer and displaysZ

Left control panel=
;R Calls up the menu and menu bar9
:Press briefly:
R Scrolls through lists
R Selects a submenu or function
R In the Audio menu: selects a
stored station, an audio track or
a video scene
R In the Tel (telephone) menu:
switches to the phone book and
selects a name or telephone
number9
:Press and hold:
R In the Audio menu: selects the
previous/next station or selects
an audio track or a video scene
using rapid scrolling
R In the Tel (telephone) menu:
starts rapid scrolling through the
phone bookaR Confirms a selection/display
message
R In the Tel (telephone) menu:
switches to the telephone book
and starts dialing the selected
number
R In the Audio menu: stops the
station search function at the
desired station
Right control panel
~R Rejects or ends a call
R Exits phone book/redial
memory6R Makes or accepts a call
R Switches to the redial memoryW
XR Adjusts the volume8RMute
Back button
%Press briefly:
R Back
R Switches off the Voice Control
System
R Hides display messages or calls
up the last Trip menu function
used
R Exits the telephone book/redial
memory%Press and hold:
R Calls up the standard display in
the Trip menu
Multifunction display
Values and settings as well as display
messages are shown in the multifunction
display.
:Description field;Menu bar=Drive program?Outside temperature or speed
( Y page 206)ATransmission position196Displays and operationOn-board computer and displays

XTo show menu bar ;: press the =
or ; button on the steering wheel.
The following messages may appear in the
multifunction display:
X j YParking Guidance ( Y page 178)_Adaptive Highbeam Assist
( Y page 110)ÀATTENTION ASSIST ( Y page 182)ÃLane Keeping Assist ( Y page 185) or
Active Lane Keeping Assist
( Y page 190)HOLDHOLD function ( Y page 172)ÄPRE-SAFE ®
Brake ( Y page 65)Displays and operation197On-board computer and displaysZ

Menus and submenus
Menu overview
The number of menus shown depends on the optional equipment in the vehicle.
Function:Trip menu ( Y page 199);Navi menu (navigation details) ( Y page 200)=Audio menu ( Y page 201)?Tel menu (telephone) ( Y page 202)ADriveAssist menu (assistance) ( Y page 204)BServ. menu ( Y page 206)
R calls up display messages ( Y page 213)
R tire pressure loss warning system (Canada only) ( Y page 317)
R tire pressure monitor ( Y page 319)
R ASSYST PLUS service interval display ( Y page 282)CSett. menu ( Y page 206)DAMG menu in AMG vehicles ( Y page 210)
The Audio and Tel menus differ slightly in vehicles with an audio system and vehicles with
COMAND. The examples given in this Operator's Manual apply to vehicles equipped with
COMAND.
198Menus and submenusOn-board computer and displays

Trip menu
Standard displayXPress and hold the % button on the
steering wheel until the Trip menu with
odometer : and trip odometer ; is
shown.
Trip computer "From start" or "From
reset"
The values in the From Start submenu are
calculated from the start of a journey, while
the values in the From Reset submenu are
calculated from the last time the submenu
was reset ( Y page 200).
XPress the = or ; button on the
steering wheel to select the Trip menu.XPress the 9 or : button to select
From Start or From Reset .
Trip computer "From start" (example)
:Distance;Time=Average speed?Average fuel consumption
The From Start trip computer is reset
automatically if:
R the ignition has been switched off for more
than four hours.
R 999 hours have been exceeded.
R 9,999 miles have been exceeded.
When 9,999 hours or 99,999 miles have been
exceeded, the trip computer is automatically
reset From Reset .
Displaying the range and current fuel
consumptionXPress the = or ; button on the
steering wheel to select the Trip menu.XPress the 9 or : to select the
current fuel consumption 16
and 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, the display shows
a vehicle being refueled C instead of the
range.
Digital speedometer
XPress the = or ; button on the
steering wheel to select the Trip menu.XPress 9 or : to select the digital
speedometer.:Digital speedometer16 Not AMG vehicles.Menus and submenus199On-board computer and displaysZ

Resetting values
You can reset the values of the following
functions:
R Trip odometer
R Trip computer "From start"
R Trip computer "From reset"
XPress the = or ; button on the
steering wheel to select the Trip menu.XPress the 9 or : button to select the
function that you wish to reset.XPress a.
Resetting the trip computer "From start" (example)
XPress : to select Yes and press a
to confirm.
Navigation system menu
Displaying navigation instructions
In the Navi menu, the multifunction display
shows navigation instructions. For more
information, see the separate operating
instructions.
XSwitch on COMAND (see the separate
operating instructions).XPress the = or ; button on the
steering wheel to select the Navi menu.Route guidance inactive:Direction of travel;Current road
Route guidance active
No change of direction announced
:Distance to the destination;Distance to the next change of direction=Current road?Symbol for "follow the road's course"
Change of direction announced without a
lane recommendation
:Road into which the change of direction
leads;Distance to change of direction and visual
distance display=Current road?Symbol for change of direction
When a change of direction has been
announced, you will see visual distance
display ; next to the symbol for change of
200Menus and submenusOn-board computer and displays