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Towing a trailer ! Fold in the ball coupling if the trailer tow hitch is not required. PARKTRONIC meas- ures the minimum detection range to an obstacle from the bumper, not the ball cou- pling.
PARKTRONIC is deactivated for the rear area when you establish an electrical connection between your vehicle and a trailer.
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Problems with PARKTRONIC
Problem Only the red segments in the PARKTRONIC warning displays are lit. You also hear a warning tone for approximately two seconds. PARKTRONIC is deacti- vated after approx- imately five seconds, and the indicator lamp in the PARKTRONIC button lights up. Only the red segments in the PARKTRONIC warning displays are lit. PARKTRONIC is deacti- vated after approx- imately five seconds.
Possible causes/consequences and M Solutions PARKTRONIC has malfunctioned and has switched off. X If problems persist, have PARKTRONIC checked at a qualified
specialist workshop.
The PARKTRONIC sensors are dirty or there is interference. X Clean the PARKTRONIC sensors (Y page 294). X Switch the ignition back on. The problem may be caused by an external source of radio or ultrasound waves. X See if PARKTRONIC functions in a different location.
Active Parking Assist Important safety notes Active Parking Assist is only an aid. It is not a substitute for your attention to the immediate surroundings. The responsibility for safe manoeuvring and parking remains with you. Make sure that there are no persons, animals or objects in range while manoeuvring and parking. G WARNING The vehicle will veer out when parking and can take you onto sections of the oncoming lane. As a result, you may collide with other road users. There is a risk of an accident. When parking, pay attention to other road users. Stop the vehicle if necessary or cancel the Active Parking Assist parking procedure.
! If unavoidable, you should drive over
obstacles such as kerbs slowly and not at
a sharp angle. Otherwise, you may damage the wheels or tyres.
Active Parking Assist may also display spaces not suitable for parking, e.g.: Rparking or stopping prohibitions Rin front of driveways or entrances and exits Runsuitable surfaces Parking tips: Ron narrow roads, drive as closely as possi-
ble past the parking space.
Rparking spaces that are littered, overgrown
or partially occupied by trailer drawbars might be identified incorrectly or not at all. Rsnowfall or heavy rain may lead to a parking
space being measured inaccurately.
Rpay attention to the PARKTRONIC
(Y page 184) warning messages during the parking procedure.
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Rat any time, you can intervene in the steer- ing procedure to correct it. Active Parking Assist will then be cancelled.
Rwhen transporting a load which protrudes
from your vehicle, you should not use Active Parking Assist.
Rnever use Active Parking Assist when snow
chains are fitted.
Rmake sure that the tyre pressures are
always correct. This has a direct influence on the parking characteristics of the vehi- cle.
General notes Active Parking Assist is an electronic parking aid with ultrasound. Ultrasound is used to measure the road on both sides of the vehicle. A suitable parking space is indicated by the parking symbol. Active steering intervention can assist you during parking. You may also use PARKTRONIC (Y page 182). When PARKTRONIC is switched off, Active Parking Assist is also unavailable. Use Active Parking Assist for parking spaces: Rthat are parallel to the direction of travel Rthat are on straight roads, not bends Rthat are on the same level as the road, e.g.
not on the pavement
Detecting parking spaces Objects located above the height range of Active Parking Assist will not be detected when the parking space is measured. These are not taken into account when the parking procedure is calculated, e.g. overhanging loads, tail sections or loading ramps of goods vehicles. G WARNING If objects are located above the detection range, Active Parking Assist may start to steer into the parking space too soon. As a result, you could cause a collision. There is a risk of an accident.
If objects are located above the detection range, stop the vehicle and switch Active Parking Assist off.
For further information on the detection range (Y page 183). Active Parking Assist does not support you parking in spaces that are parallel to the direction of travel if: Rthe parking space is on a kerb stone Rthe parking space appears to be blocked,
for example by foliage or grass paving blocks
Rthe range of movement is too small Rthe parking space is bordered by an obsta- cle which is not clearly defined such as a tree or a trailer
: Detected parking space on the left ; Parking symbol = Detected parking space on the right Active Parking Assist is activated automati- cally when driving forwards. The system is operational at speeds of up to approximately 35 km/h. While in operation, the system inde- pendently locates and measures parking spaces on both sides of the vehicle. Active Parking Assist will only detect parking spaces: Rthat are parallel to the direction of travel Rthat are at least 1.5 m wide Rthat are at least 1.3 m longer than your
vehicle
i In the case of parking spaces that are at
right angles to the direction of travel, please ensure that the parking space is long enough to accommodate your vehicle.
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When driving at speeds below 30 km/h, you will see parking symbol ; as a status indi- cator in the instrument cluster. When a park- ing space has been detected, an arrow towards the right or the left also appears. Active Parking Assist only displays parking spaces on the front-passenger side as stand- ard. Parking spaces on the driver's side are displayed as soon as the turn signal on the driver's side is activated. When parking on the driver's side, this must remain switched on until you acknowledge the use of Active Park- ing Assist by pressing the a button on the multifunction steering wheel. A parking space is displayed while you are driving past it, and until you are approx- imately 15 m away from it.
Parking G WARNING Active Parking Assist merely aids you by inter- vening actively in the steering. There is a risk of accident if you do not apply the brakes yourself. Always apply the brakes yourself when park- ing and manoeuvring.
Active Parking Assist does not support you with parking spaces parallel to the direction of travel if: Rthe parking space is on a kerbstone Rthe parking space is apparently blocked,
for example by foliage or grass paving blocks
Rthe range of movement is too small Rthe parking space is bordered by an obsta- cle which is not clearly defined such as a tree or a trailer
X Stop the vehicle when the parking symbol
shows the desired parking space in the instrument cluster.
X Vehicles with manual transmission: shift to
reverse gear.
Vehicles with automatic transmission: shift into position R. The Start Park Assist? Yes: OK No: % message appears in the multifunction display.
X To cancel the procedure: press the
% button on the multifunction steering wheel or pull away.
or X To park using Active Parking Assist:
press the a button on the multifunction steering wheel. The Park Assist active Accelerate and brake Observe surroundings mes- sage appears in the multifunction display. X Release the multifunction steering wheel. X Reverse the vehicle, being ready to brake
at all times. Do not exceed a maximum speed of approximately 10 km/h when reversing. Otherwise, Active Parking Assist will be cancelled.
i In tight parking spaces, you will achieve the best parking results by backing up as far as possible. When doing so, also observe the PARKTRONIC messages.
X Stop as soon as PARKTRONIC sounds the
continuous warning tone, if not before. Manoeuvring may be required in tight park- ing spaces. Vehicles with manual transmission: the Park Assist active Engage forward gear Observe surroundings message appears in the multifunction display. Vehicles with automatic transmission: the Park Assist active Select D Observe surroundings message appears in the mul- tifunction display. X Vehicles with manual transmission: while the vehicle is stationary, shift to first gear. Vehicles with automatic transmission: select transmission position D while the vehicle is stationary. Active Parking Assist immediately steers in the other direction.
The Park Assist active Accelerate and brake Observe surroundings mes- sage appears in the multifunction display. i You will achieve the best results by wait- ing for the steering procedure to complete before pulling away.
X Drive forwards and be ready to brake at all
times.
X Stop as soon as PARKTRONIC sounds the continuous warning tone, if not before. Vehicles with manual transmission: the Park Assist active Engage reverse gear Observe surroundings message appears in the multifunction display. Vehicles with automatic transmission: the Park Assist active Select R Observe surroundings message appears in the mul- tifunction display. X Additional transmission shifts may be nec-
essary. As soon as the parking procedure is com- plete, the Park Assist switched off message appears in the multifunction dis- play. Active Parking Assist is then deactivated. PARKTRONIC is still available.
X Manoeuvre if necessary. X Always observe the warning messages dis-
played by PARKTRONIC (Y page 184).
Parking tips: Rthe way your vehicle is positioned in the parking space after parking is dependent on various factors. These include the posi- tion and shape of the vehicles parked in front and behind it and the conditions of the location. It may be the case that Active Parking Assist guides you too far into a parking space, or not far enough into it. In some cases, it may also lead you across or onto the kerb. If necessary, you should can- cel the parking procedure with Active Park- ing Assist.
Ryou can also engage forward gear prema- turely. The vehicle redirects and does not drive as far into the parking space. Should
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a gear be changed too early, the parking procedure will be cancelled. A sensible parking position can no longer be achieved from this position.
Exiting a parking space In order that Active Parking Assist can sup- port you when you exit the parking space: Rthe border of the parking space must not
be too low.
Rthe border of the parking space must not be too wide. The system manoeuvres the vehicle into a position at a maximum of 45° to the starting position in the parking space.
Ra manoeuvring distance of at least 0.60 m
must be available.
Active Parking Assist can only assist you with exiting a parking space if you have parked the vehicle using Active Parking Assist. X Start the engine. X Switch on the turn signal on the side facing
the street.
X Vehicles with manual transmission:
engage first or reverse gear. Vehicles with automatic transmission: shift the transmission to position D or R. The Start Park Assist? Yes: OK No: % message appears in the multifunction display.
X To cancel the procedure: press the
% button on the multifunction steering wheel or pull away.
or X To exit a parking space using Active
Parking Assist: press the a button on the multifunction steering wheel. The Park Assist active Accelerate and brake Observe surroundings mes- sage appears in the multifunction display. X Release the multifunction steering wheel. X Reverse the vehicle or drive forwards, being ready to brake at all times. Do not exceed a maximum speed of approximately
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10 km/h when exiting a parking space. Otherwise, Active Parking Assist will be cancelled.
X Stop when PARKTRONIC sounds the con-
tinuous warning tone, if not before.
X Vehicles with manual transmission: shift to first or reverse gear as required while the vehicle is stationary. Vehicles with automatic transmission: shift to position D or R as required while the vehicle is stationary. Active Parking Assist immediately steers in the other direction. The Park Assist active Accelerate and brake Observe surroundings message appears in the multifunction display.
i You will achieve the best results by wait- ing for the steering procedure to complete before pulling away. If you reverse after activation, the steering wheel is moved to the straight-ahead posi- tion.
X Drive forwards or reverse the vehicle, being
ready to brake at all times.
X Stop as soon as PARKTRONIC sounds the
continuous warning tone, if not before.
X Drive forwards and reverse as prompted by the PARKTRONIC warning displays, several times if necessary.
Once you have exited the parking space com- pletely, the steering wheel is moved to the straight-ahead position. You hear a tone and the Park Assist switched off message appears in the multifunction display. You will then have to steer and merge into traffic on your own. PARKTRONIC is still available.
Cancelling Active Parking Assist You can cancel Active Parking Assist at any time. X Stop the movement of the multifunction
steering wheel or steer yourself. Active Parking Assist will be cancelled at once. The Park Assist cancelled mes- sage appears in the multifunction display.
or X Press the PARKTRONIC button on the
centre console (Y page 185). PARKTRONIC is switched off and Active Parking Assist is immediately cancelled. The Park Assist cancelled message appears in the multifunction display.
Active Parking Assist is cancelled automati- cally if: Ryou engage the electric parking brake. Rparking using Active Parking Assist is no
longer possible.
Ryou are driving faster than 10 km/h. Ra wheel spins and ESP® intervenes or fails.
The ÷ warning lamp lights up in the instrument cluster.
A warning tone sounds. The parking space symbol disappears and the multifunction dis- play shows the Park Assist cancelled message. When Active Parking Assist is cancelled, you must steer again yourself. If a system malfunction occurs, the vehicle is braked to a standstill. To drive on, depress the accelerator again.
Towing a trailer For vehicles with a trailer tow hitch, the min- imum required length for parking spaces is slightly increased. If you have attached a trailer to your vehicle, you should not use Active Parking Assist. Once the electrical connection is established between your vehicle and the trailer, Active Parking Assist is no longer available. PARK- TRONIC is deactivated for the rear area.
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show the area behind your vehicle in the Audio/COMAND display. The area behind the vehicle is displayed as a mirror image, as in the rear-view mirror. i The text of messages shown in the
COMAND display depends on the language setting. The following are examples of reversing camera messages in the COMAND display.
Activating/deactivating the reversing camera X To activate: make sure that the key is in
position 2 in the ignition lock.
X Make sure that the "Activation by R gear"
setting is active in the audio system/ COMAND Online; see the separate audio system/COMAND Online operating instructions.
X Engage reverse gear.
Guide lines are used to show the area behind the vehicle in the Audio/COMAND display.
Reversing camera Important safety notes The reversing camera is only an aid. It is not a substitute for your attention to the imme- diate surroundings. The responsibility for safe manoeuvring and parking remains with you. Make sure that there are no persons, animals or objects in range while manoeuvring and parking. Under the following circumstances, the reversing camera will not function, or will function in a limited manner: Rif the tailgate is open Rin heavy rain, snow or fog Rat night or in very dark places Rif the camera is exposed to very bright light Rif the area is lit by fluorescent light or LED
lighting (the display may flicker)
Rif there is a sudden change in temperature,
e.g. when driving into a heated garage in winter
Rif the camera lens is dirty or obstructed Rif the rear of your vehicle is damaged. In this event, have the camera position and setting checked at a qualified specialist workshop.
General notes
Reversing camera : is in the boot lid handle. The reversing camera extends, when it is acti- vated. The reversing camera is an optical parking and manoeuvring aid. It uses guide lines to
Function mode display for vehicles with COMAND Online and a trailer tow hitch X To change the function mode in vehi- cles with COMAND Online and trailer tow hitch: using the COMAND controller, select symbol : for the "Reverse parking"
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function; see the separate COMAND Online operating instructions.
or X Select symbol ; for the coupling up a
trailer function (see the separate COMAND Online operating instructions). The symbol of the selected function is high- lighted.
To deactivate: the reversing camera is deac- tivated if you: Rselect transmission position P (vehicles
with automatic transmission)
Rdrive forward ten metres Rfor vehicles with an automatic transmis-
sion, shift the transmission from R to another position after 15 seconds
Rshift out of reverse gear (vehicles with man-
ual transmission) after 15 seconds
Rdrive forwards at a speed of over
10 km/h
Displays in the Audio/COMAND display The reversing camera may show a distorted view of obstacles, show them incorrectly or not at all. Obstacles are not shown by the reversing camera in the following locations: Rvery close to the rear bumper Runder the rear bumper Rin the area immediately above the tailgate
handle
! Objects not at ground level may appear to be further away than they actually are, e.g.: Rthe bumper of a parked vehicle Rthe drawbar of a trailer Rthe ball coupling of a trailer tow hitch Rthe rear section of an HGV Ra slanted post Use the guidelines only for orientation. Approach objects no further than the bot- tom-most guideline.
Lanes : White guide line without turning the steer-
ing wheel, vehicle width including the exterior mirrors (static)
; Yellow lane marking the course the tyres
will take at the current steering wheel angle, vehicle width including the outer edge of the wheel (dynamic)
= Red guide line for the vehicle width includ- ing the exterior mirrors, for current steer- ing wheel angle (dynamic)
? Bumper
Guide lines ? Bumper A Red guide line at a distance of approx-
imately 0.25 m from the rear of the vehicle B Yellow guide line at a distance of approx- imately 4.0 m from the rear of the vehicle C Vehicle centre axle (marker assistance) D Yellow guide line at a distance of approx- imately 1.0 m from the rear of the vehicle The lanes and guide lines are only displayed if you have engaged reverse gear.
The distance specifications only apply to objects that are at ground level.
Reversing straight into a parking space without turning the steering wheel
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Additional displays on vehicles with PARKTRONIC and COMAND Online : Front warning display ; Additional PARKTRONIC operational read-
iness indicator
= Rear warning display Vehicles with PARKTRONIC and COMAND Online: when PARKTRONIC is operational (Y page 182), additional operational readi- ness indicator ; appears in the COMAND display.If the PARKTRONIC warning displays are active or light up, warning displays : and = are also active or light up correspondingly in the COMAND display.
Reverse parking function X Make sure that the reversing camera is
activated and the "Reverse parking" func- tion is selected; see the separate operating instructions for the audio system/ COMAND Online. The lane and the guide lines are shown.
: White lane indicating the route the vehicle will take with the steering wheel straight ; Yellow guide line at a distance of approx- imately 1.0 m from the rear of the vehicle
= Red guide line at a distance of approx-
imately 0.25 m from the rear of the vehicle
X With the help of white lane :, check
whether the vehicle will fit into the parking space.
X Using the white lane as a guide, carefully reverse until you reach the end position. Red guide line = is then at the end of the parking space. The vehicle is almost paral- lel in the parking space.
Reverse perpendicular parking with the steering wheel at an angle X Drive past the parking space and bring the
vehicle to a standstill.
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Turning the steering wheel : Red lane indicating the route the vehicle will take with the steering wheel in its cur- rent position
; Parking space marking X While the vehicle is at a standstill, turn the steering wheel in the direction of the park- ing space until the red lane reaches parking space marking ;.
X Keep the steering wheel in that position
and reverse carefully.
Driving to the final position : White lane indicating the route the vehicle will take with the steering wheel in its cur- rent position
; Parking space marking X Turn the steering wheel to the centre posi-
tion while the vehicle is stationary.
Reversing with the steering wheel turned : Red lane indicating the route the vehicle will take with the steering wheel in its cur- rent position
X Stop the vehicle when it is almost exactly
in front of the parking space. The white lane should be as close to parallel with the parking space marking as possi- ble.
: Red guide line at a distance of approx-
imately 0.25 m from the rear of the vehicle ; White lane indicating the route the vehicle will take with the steering wheel straight
= End of parking space X Reverse carefully until you have reached
the end position. Red guide line : is then at end of parking space =. The vehicle is almost parallel in the parking space.
"Coupling up a trailer" function This function is only available on vehicles with a trailer tow hitch and COMAND Online.
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apply to objects that are at the same level as the ball coupling.
X Reverse carefully, making sure that trailer
drawbar locating aid = points approx- imately in the direction of trailer draw- bar ?.
X Reverse carefully until trailer drawbar ?
touches red guide line ;.
X Couple up the trailer (Y page 201).
ATTENTION ASSIST General notes ATTENTION ASSIST helps you during long, monotonous journeys such as on motorways and trunk roads. It is active in the 80 km/h to 180 km/h range. If ATTENTION ASSIST detects typical indica- tors of fatigue or increasing lapses in con- centration on the part of the driver, it sug- gests taking a break.
Important safety notes ATTENTION ASSIST is only an aid. It cannot always detect fatigue or lapses in concentra- tion until too late or not at all. The system is not a substitute for a well-rested and atten- tive driver. ATTENTION ASSIST assesses your level of fatigue or lapses in concentration by taking the following criteria into account: Ryour personal driving style, e.g. steering
characteristics
Rjourney-related parameters, e.g. time of
day, length of journey
The functionality of ATTENTION ASSIST is restricted, and warnings may be delayed or not occur at all: Rif the road condition is poor, e.g. if the sur-
face is uneven or if there are potholes
Rif there is a strong side wind
: Vehicle centre point on the yellow guide line at a distance of approximately 1.0 m from the rear of the vehicle
; Trailer drawbar = Ball coupling X Set the height of trailer drawbar ; so that
it is slightly higher than ball coupling =. X Position the vehicle centrally in front of
trailer drawbar ;.
: Ball coupling ; Red guide line at a distance of approx- imately 0.25 m from the ball coupling
= Trailer drawbar locating aid ? Trailer drawbar A Symbol for the "Coupling up a trailer"
function
X Select symbol A with the Audio/COMAND
controller; see the separate operating instructions for the audio system/ COMAND Online. The "Coupling up a trailer" function is selec- ted. The distance specifications now only
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Rif you have adopted a sporty driving style with high cornering speeds or high rates of acceleration
Rif you are predominantly driving slower than 80 km/h or faster than 180 km/h
Rif you are currently using COMAND Online or making a telephone call with COMAND Online
Rif the time has been set incorrectly Rin active driving situations, such as when you change lanes or change your speed
Warning and display messages in the multifunction display X Activate ATTENTION ASSIST using the on-
board computer (Y page 219). If ATTENTION ASSIST is active, you will be warned no sooner than 20 minutes after your journey has begun. You then hear an intermittent warning tone twice and the Attention Assist: Take a break! message appears in the multifunction dis- play.
X If necessary, take a break. X Press the a or % button to confirm
the message.
On long journeys, take regular breaks in good time to allow yourself to rest properly. If you do not take a break, you will be warned again after 15 minutes at the earliest. This will only happen if ATTENTION ASSIST still detects typical indicators of fatigue or increasing lap- ses in concentration. ATTENTION ASSIST is reset and starts assessing your tiredness again when you con- tinue your journey if: Ryou switch off the engine Ryou take off your seat belt and open the
driver's door, e.g. for a change of drivers or to take a break
When ATTENTION ASSIST is deactivated, the é symbol appears in the multifunction display in the assistance graphic display.
Speed Limit Assist General notes Speed Limit Assist shows you detected speed limits in the multifunction display. Data from the navigation system is also used for this purpose. If a traffic sign indicating a speed limit or the end of a speed limit is detected, it is shown in the multifunction display. If Speed Limit Assist does not detect any traffic signs, the speed limit from the digital road map is taken and shown in the display. Speed Limit Assist detects the traffic signs with a camera attached behind the top of the windscreen.
: Speed Limit Assist camera
Important safety notes Speed Limit Assist is only an aid and does not always detect traffic signs specifying the maximum permissible speed. Traffic signs always have priority over the Speed Limit Assist display. The system may be impaired or may not func- tion if: Rthere is poor visibility, e.g. due to snow,
rain, fog or spray
Rthere is glare, e.g. from the sun or from
oncoming traffic
Rthe windscreen is dirty, misted up or cov- ered, for instance by a sticker, in the vicinity of the camera
Rthe traffic signs are covered, for instance
by dirt, snow or trees
Rthe traffic signs are poorly illuminated Rthere are ambiguous traffic signs, for
instance near roadworks or on multi-lane roads
Information in the multifunction display Briefly showing detected traffic signs in the multifunction display X Activate the Speed Limit Assist warning
function using the on-board computer (Y page 218). A traffic sign indicating a speed limit or the end of a speed limit appears in the multi- function display for around five seconds as soon as it is detected. Any other informa- tion in the multifunction display is hidden for this period.
: Maximum permissible speed (example) ; Maximum permissible speed for vehicles subject to the restriction in the additional sign (example)
= Additional character in fog ? Speed Limit Assist is available and
switched on
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Permanently showing detected traffic signs in the multifunction display X Display the assistance graphic using the
on-board computer (Y page 217). A traffic sign indicating a speed limit or the end of a speed limit appears in the multi- function display as soon as it is detected. The traffic sign indicating a speed limit : is generally displayed until: Ra traffic sign indicating the end of the speed
limit is detected. Ryou make a turn. Ryou leave or enter a town. Rthe road type changes (e.g. motorway,
country road).
Ryou have travelled a certain minimum dis- tance without the traffic sign being repea- ted or detected again.
Lane Tracking package General notes The Lane Tracking package consists of Blind Spot Assist (Y page 198) and Lane Keeping Assist (Y page 199).
Blind Spot Assist Important safety notes G WARNING Blind Spot Assist does not react to: Rvehicles overtaken too closely on the side,
placing them in the blind spot area
Rif you overtake these with a difference in
speed in excess of 12 km/h
Ror if they approach with a great relative
speed and overtake you
As a result, Blind Spot Assist cannot warn drivers in these situations. There is a risk of an accident. Always pay careful attention to the traffic sit- uation and maintain a safe distance at the side of the vehicle.
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Blind Spot Assist is only an aid. It may fail to detect some vehicles and is no substitute for attentive driving. General notes Blind Spot Assist uses a radar sensor system to monitor the areas on both sides of your vehicle. It supports you from speeds of 30 km/h. A warning display in the exterior mirrors draws your attention to vehicles detected in the monitored area. If you then switch on the corresponding turn signal to change lane, you will also receive an optical and audible collision warning. For this pur- pose, Blind Spot Assist uses sensors in the rear bumper. The radar sensor system is switched off auto- matically in the vicinity of radio telescope facilities (Y page 350). For Blind Spot Assist to assist you when driv- ing, the radar sensor system must be: Ractivated(Y page 223) Roperational i In some countries you must deactivate the radar sensor system (Y page 223). For further information about the radar sen- sor system; see (Y page 350).
Monitoring range of the sensors In particular, the detection of obstacles can be impaired in the case of: Rdirt on the sensors or anything else cover-
ing the sensors
Rpoor visibility, e.g. due to fog, heavy rain or
snow
Ra narrow vehicle travelling in front, e.g. a
motorcycle or a bicycle
Rvery wide lanes Rnarrow lanes Rvehicles not driving in the middle of their
lane
Rbarriers or other road boundaries Vehicles in the monitoring range are then not indicated.
Blind Spot Assist monitors the area up to 3.0 m behind your vehicle and directly next to your vehicle, as shown in the diagram. For this purpose, Blind Spot Assist uses radar sensors in the rear bumper. If the lanes are narrow, vehicles driving in the lane beyond the lane next to your vehicle may be indicated, especially if the vehicles are not driving in the middle of their lane. This may be the case if the vehicles are driving on the inner side of their lane. Due to the nature of the system: Rwarnings may be issued in error when driv- ing close to crash barriers or similar solid lane borders.
Rwarnings may be interrupted when driving
alongside particularly long vehicles, for example lorries, for a prolonged time. The two sensors for Blind Spot Assist are integrated into the sides of the rear bumper. Make sure that the bumper is free of dirt, ice or slush in the vicinity of the sensors. The radar sensors must not be covered, for exam- ple by cycle racks or overhanging loads. Fol- lowing a severe impact or in the event of dam- age to the bumpers, have the function of the radar sensors checked at a qualified special- ist workshop. Blind Spot Assist may other- wise not work properly.
Indicator and warning display Blind Spot Assist is not active at speeds below approximately 30 km/h. Vehicles in the mon- itoring range are then not indicated.
: Yellow indicator lamp/red warning lamp If Blind Spot Assist is switched on, indicator lamp : in the exterior mirrors lights up yel- low up to a speed of 30 km/h. At speeds above 30 km/h, the indicator lamp goes out and Blind Spot Assist is operational. If a vehicle is detected within the monitoring range of Blind Spot Assist at speeds above 30 km/h, warning lamp : on the corre- sponding side lights up in red. This warning always occurs when a vehicle enters the blind spot monitoring range from behind or from the side. When you overtake a vehicle, the warning only occurs if the difference in speed is less than 12 km/h. The yellow indicator lamp goes out if reverse gear is engaged. Blind Spot Assist is then deactivated. The brightness of the indicator/warning lamps is adjusted automatically according to the ambient light. Collision warning If a vehicle is detected in the monitoring range of Blind Spot Assist and you switch on the corresponding turn signal, a double warning tone sounds. Red warning lamp : flashes. If the turn signal remains on, detected vehicles are indicated by the flashing of red warning lamp :. There are no further warning tones.
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Activating Blind Spot Assist X Make sure that the radar sensor system
(Y page 223) and Blind Spot Assist (Y page 219) are activated in the on-board computer.
X Turn the key to position 2 in the ignition
lock. Warning lamps : in the exterior mirrors light up red for approximately 1.5 seconds and then turn yellow.
Towing a trailer If you attach a trailer, make sure that you have correctly established the electrical connec- tion. This can be accomplished by checking the trailer lighting. Blind Spot Assist is then deactivated. The indicator lamp lights up yel- low in the exterior mirrors and the Blind Spot Assist currently unavailable See Owner's Manual message appears in the multifunction display. i You can deactivate the indicator lamps in
the exterior mirrors. To do so, switch off Blind Spot Assist if: Rthe key is in position 2 in the ignition
lock.
Rthe engine is not running. Rthe electrical connection to the trailer
has been established.
Lane Keeping Assist General notes Lane Keeping Assist monitors the area in front of your vehicle by means of a camera at the top of the windscreen. Lane Keeping Assist detects lane markings on the road and warns you before you leave your lane unin- tentionally.
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for vehicle speed, for braking in good time, and for staying in the lane. Lane Keeping Assist does not keep your vehi- cle in its lane. The system may be impaired or may not func- tion if: Rthere is poor visibility, e.g. due to insuffi-
cient illumination of the road, or due to snow, rain, fog or spray
Rthere is glare, e.g. from oncoming traffic, the sun or reflection from other vehicles (e.g. if the road surface is wet)
Rthe windscreen is dirty, misted up, dam- aged or covered, for instance by a sticker in the vicinity of the camera
Rno, or several, unclear lane markings are
present for one lane, e.g. in a construction area
Rthe lane markings are worn away, dark or
covered up, e.g. by dirt or snow
Rthe distance to the vehicle in front is too
small and the lane markings thus cannot be detected
Rthe lane markings change quickly, e.g. lanes branch off, cross one another or merge
Rthe road is narrow and winding Rthere are highly variable shade conditions
on the road
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. Activating Lane Keeping Assist X Activate Lane Keeping Assist using the on- board computer; to do so, select Stand‐ ard or Adaptive(Y page 219). If you drive at speeds above 60 km/h and lane markings are detected, the lane mark- ings in the assistance graphics display (Y page 217) are shown in green.
: Lane Keeping Assist camera If you select km on the on-board computer in the Display unit Speed-/odometer func- tion (Y page 220), Lane Keeping Assist is active starting at a speed of 60 km/h. If the miles display unit is selected, the assistance range begins at 40 mph. Important safety notes G WARNING Lane Keeping Assist cannot always clearly identify lane markings. In these cases, 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 keep in lane, especially if Lane Keeping Assist alerts you. G WARNING The Lane Keeping Assist warning does not return the vehicle to the original lane. There is a risk of an accident. Always steer, apply the brakes or accelerate the vehicle yourself, especially if Lane Keep- ing Assist alerts you.
If you fail to adapt your driving style, Lane Keeping Assist can neither reduce the risk of an accident nor override the laws of physics. Lane Keeping Assist cannot take into account road, weather or traffic conditions. Lane Keeping Assist is only an aid. You are respon- sible for the distance to the vehicle in front,
When Standard is selected, no warning vibra- tion occurs if: Ryou have switched on the turn signals. In this event, the warnings are suppressed for a certain period of time.
Ra driving safety system intervenes, such as
ABS, BAS or ESP®.
When Adaptive is selected, no warning vibra- tion occurs if: Ryou have switched on the turn signals. In this case, the warnings are suppressed for a certain period of time.
Ra driving safety system intervenes, such as
ABS, BAS or ESP®.
Ryou accelerate hard, e.g. kickdown. Ryou brake hard. Ryou steer actively, e.g. swerve to avoid an
obstacle or change lane quickly.
Ryou cut the corner on a sharp bend. In order that you are warned only when nec- essary and in good time if you cross the lane marking, the system recognises certain con- ditions and warns you accordingly. The warning vibration occurs earlier if: Ryou approach the outer lane marking on a
bend.
Rthe road has very wide lanes, e.g. a motor-
way.
Rthe system recognises solid lane markings. The warning vibration occurs later if: Rthe road has narrow lanes. Ryou cut the corner on a bend.
Towing a trailer Notes on towing a trailer Important safety notes G WARNING The braking system can overheat if you leave your foot on the brake pedal while driving. This increases the braking distance and could
Towing a trailer
201
even cause the braking system to fail. There is a risk of an accident. Never use the brake pedal as a footrest. Do not simultaneously depress both the brake pedal and the accelerator pedal while driving. G WARNING You could lose control of the vehicle/trailer combination if it begins to swerve. The vehi- cle/trailer combination could even overturn. There is a risk of an accident. On no account should you attempt to straighten out the vehicle/trailer combina- tion by increasing speed. Decrease your speed and do not countersteer. Brake if nec- essary. G WARNING If the maximum the permissible load for a car- rier system is exceeded, the carrier could come loose from the vehicle and endanger other road users. There is a risk of an accident and injury. Never exceed the permissible noseweight when using a carrier.
! Depressing the brake pedal constantly
results in excessive and premature wear to the brake pads.
Trailer towing is not permissible on the fol- lowing models: RA 45 AMG 4MATIC RVehicles with the AMG Sports package If you exceed the maximum permissible nose- weight of the trailer drawbar on the ball cou- pling, the following may become damaged: Ryour vehicle Rthe trailer Rthe ball coupling Rthe trailer tow hitch The vehicle/trailer combination could become unstable. If the noseweight used is lower than the min- imum permissible noseweight, the vehicle/
202 Towing a trailer
trailer combination could also become unsta- ble. To avoid hazardous situations: Rmake sure to check the noseweight before
each journey.
Ruse a drawbar noseweight as close as pos-
sible to the maximum noseweight.
Rdo not exceed the maximum permissible
noseweight.
Rdo not use a noseweight lower than the
minimum permissible trailer drawbar nose- weight.
When reversing the vehicle towards the trailer, make sure there is nobody between the trailer and the vehicle. Couple and uncouple the trailer carefully. If you do not couple the trailer to the towing vehicle correctly, the trailer could become detached. Make sure that the following values are not exceeded: Rthe permissible trailer drawbar noseweight Rthe permissible trailer load Rthe permissible rear axle load of the towing
vehicle
Rthe maximum permissible gross vehicle
weight of both the towing vehicle and the trailer
The applicable permissible values, which must not be exceeded, can be found: Rin your vehicle documents Ron the identification plates of the trailer tow
hitch and the trailer
Ron the vehicle identification plate If the values differ, the lowest value applies. You will find the values approved by the man- ufacturer on the vehicle identification plates and those for the towing vehicle under "Tech- nical data" (Y page 349). When towing a trailer, your vehicle's handling characteristics will be different in comparison to when driving without a trailer.
The vehicle/trailer combination: Ris heavier Ris restricted in its acceleration and gradi-
ent-climbing capability
Rhas an increased braking distance Ris affected more by strong crosswinds Rdemands more sensitive steering Rhas a larger turning circle This can impair the vehicle's handling char- acteristics. Adapt your style of driving accord- ingly. Maintain a safe distance. Drive care- fully. When towing a trailer, always adjust your speed to the current road and weather con- ditions. Do not exceed the maximum permis- sible speed for your vehicle/trailer combina- tion.
General notes X When towing a trailer, set the tyre pressure on the rear axle of the towing vehicle for a maximum load; see the tyre pressure table in the fuel filler flap (Y page 321).
Please note that when towing a trailer, PARK- TRONIC (Y page 182) and Blind Spot Assist (Y page 197) availability is limited or not avail- able at all. i The height of the ball coupling changes with the load of the vehicle. If necessary, use a trailer with a height-adjustable draw- bar.
You will find fitting dimensions and loads under "Technical data" (Y page 348).
Driving tips i Observe the notes on ESP® trailer stabi-
lisation (Y page 68).
The maximum permissible speed for vehicle/ trailer combinations depends on the type of trailer. Before beginning the journey, check the trailer's documents to see what the max- imum permitted speed is. Observe the legally
Towing a trailer
203
Driving tips If the trailer swings from side to side: X Do not accelerate. X Do not countersteer. X Brake if necessary. RMaintain a greater distance from the vehi-
cle in front than when driving without a trailer.
RAvoid braking abruptly. If possible, brake gently at first to allow the trailer to run on. Then, increase the braking force rapidly.
RThe values given for gradient-climbing
capabilities from a standstill refer to sea level. When driving in mountainous areas, note that the power output of the engine, and consequently the vehicle's gradient- climbing capability, decrease with increas- ing altitude.
Folding out the ball coupling G WARNING If you release the ball coupling or it does not engage correctly when folding in, it will swing out. Within pivoting range of the ball coupling, there is an increased risk of an accident and injury. Only release the ball coupling if the pivoting range is unobstructed. Always make sure that the ball coupling engages when folding in.
Before you can tow a trailer with your vehicle, you must fold out the ball coupling. The release wheel is located behind the left- hand side trim panel in the boot.
prescribed maximum speed in the relevant country. For certain Mercedes-Benz vehicles, the max- imum permissible rear axle load is increased when towing a trailer. Refer to the "Technical data" section to find out whether this applies to your vehicle. If you utilise any of the added maximum rear axle load when towing a trailer, the vehicle/trailer combination may not exceed a maximum speed of 100 km/h for reasons concerning the operating permit. This also applies in countries in which the permissible maximum speed for vehicle/ trailer combinations is above 100 km/h. When towing a trailer, your vehicle's handling characteristics will be different in comparison to when driving without a trailer and it will consume more fuel. Change into a lower gear in good time on long and steep downhill gradients. For vehicles with automatic transmission, you need to have selected manual drive program M(Y page 156). i This also applies if you have activated
cruise control, SPEEDTRONIC or DIS- TRONIC PLUS.
This will use the braking effect of the engine, so less braking will be required to maintain vehicle speed. This relieves the load on the brake system and prevents the brakes from overheating and wearing too quickly. If you need additional braking, depress the brake pedal repeatedly rather than continuously. i Briefly depressing the accelerator pedal
on downhill gradients while the manual drive program M is temporarily activated (vehicles with automatic transmission): the automatic transmission may switch back to the last active automatic drive program E or S. The automatic transmission may shift to a higher gear. This can reduce the engine's braking effect.
204 Towing a trailer
X To open the cover: turn handle : anti-
clockwise and fold down cover ; and remove it.
X Pull out release wheel =. X Turn release wheel = anti-clockwise as far
as it will go. The ball coupling disengages and folds out behind the rear bumper. Indicator lamp ? flashes.
G WARNING If the ball coupling is not correctly engaged, the trailer can detach. There is a risk of an accident. Always engage the ball coupling as described.
X Pull the ball coupling in the direction of the arrow until it engages in a vertical position. Indicator lamp ? goes out. The power socket folds down automatically. The multifunction display shows the Check trailer hitch lock display mes- sage until the ball coupling is engaged.
X Remove the protective covering from the ball coupling and store it in a safe place.
X Make sure that the ball of the ball coupling is clean and that it is either greased or dry (grease free), depending on the instruc- tions for the trailer.
Coupling up a trailer X Make sure that the transmission is in posi-
tion P.
X Apply the electric parking brake. X Position the trailer level behind the vehicle. X Couple up the trailer. X Establish the electric connection between
the vehicle and the trailer.
X Check that the trailer lighting system is
working. A trailer that is connected is recognised only when the electrical connection is established correctly and when the lighting system is working properly. The function of other systems, such as ESP® or PARK- TRONIC also depends on this.
Uncoupling a trailer G WARNING If you uncouple a trailer with an engaged over- run brake, you could trap your hand between
Towing a trailer
205
the vehicle and the trailer drawbar. This poses a risk of injury. Do not uncouple a trailer with an engaged overrun brake.
! Do not disconnect a trailer with an
engaged overrun brake. Otherwise, your vehicle could be damaged by the rebound- ing of the overrun brake.
! Remove the installed adapter cable
before folding in the ball coupling. Other- wise, damage may occur to the rear bumper and the adapter cable.
X Make sure that the transmission is in posi-
tion P.
X Apply the electric parking brake. X Secure the trailer against rolling away. X Remove the trailer cable and decouple the
trailer.
Folding in the ball coupling G WARNING If you release the ball coupling or it does not engage correctly when folding in, it will swing out. Within pivoting range of the ball coupling, there is an increased risk of an accident and injury. Only release the ball coupling if the pivoting range is unobstructed. Always make sure that the ball coupling engages when folding in.
X Fold the ball coupling back in if you are not
using the trailer tow hitch.
X Place the protective covering on the ball
coupling.
The release wheel is located behind the left- hand side trim panel in the boot.
X To open the cover: turn handle : anti-
clockwise and fold down cover ; and remove it.
X Pull out release wheel =. X Turn release wheel = anti-clockwise as far
as it will go. The ball coupling disengages and folds out behind the rear bumper. Indicator lamp ? flashes.
206 Towing a trailer
X Press the ball coupling in the direction of
the arrow until it engages behind the bumper. Indicator lamp ? goes out and the mes- sage in the multifunction display disap- pears.
Trailer power supply ! You can connect accessories with a
power rating of up to 240 W to the perma- nent power supply and with a power rating of up to 180 W to the power supply that is switched on via the ignition lock. The trailer battery may not be charged from the power supply.
X To switch the connected power supply on or off: turn the key in the ignition lock to position 2 or 0 respectively.
When it leaves the factory, your vehicle's trailer socket is equipped with a permanent power supply and a power supply that is switched on via the ignition lock. The permanent power supply is supplied via trailer socket pin 9. The power supply that is switched on via the ignition lock is supplied via trailer socket pin 10. The trailer's permanent power supply is switched off in the event of low vehicle supply voltage and after six hours at the latest. You can find more information about instal- ling the trailer electrics at a qualified special- ist workshop.
Bulb failure indicator for LED lamps i If LED lamps are fitted in the trailer, an error message may appear in the multi- function display even if there is no fault. The reason for the error message could be that the current has fallen below the minimum of 50 mA.
To ensure reliable operation of the bulb failure indicator, each LED chain in the trailer lighting must be guaranteed a minimum current of 50 mA.
Trailer with 7-pin connector General notes Trailer with 7-pin connector: you can con- nect to the 13-pin socket on the ball coupling using an adapter or, if necessary, an adapter cable. Both can be obtained at a qualified specialist workshop.
Fitting the adapter ! Make sure that there is sufficient cable
play so that the cable cannot become detached when cornering.
! Remove the installed adapter cable
before folding in the ball coupling. Other- wise, damage may occur to the rear bumper and the adapter cable.
X Open the socket cover. X Insert the plug connector with lug : into groove = on the socket. Turn bayonet con- nection ; clockwise to the stop.
X Let the cover engage. X If you are using an adapter cable, secure
the cable to the trailer with cable ties.
Useful information ............................ 208
Important safety notes .................... 208
Displays and operation .................... 208
Menus and submenus ...................... 211
Display messages ............................. 229
Warning and indicator lamps in the instrument cluster ............................ 257207
208 Displays and operation
Useful information
i This Owner's Manual describes all mod- els, series and optional equipment for your vehicle that were available at the time of going to press. National variations are pos- sible. Note that your vehicle may not be equipped with all of the functions descri- bed. This is also the case for systems and functions relevant to safety.
i Read the information on qualified special-
ist workshops: (Y page 24).
Important safety notes
G WARNING Operating the integrated information systems and communications equipment in the vehicle while driving will distract you from traffic con- ditions. You could then lose control of the vehicle. There is a risk of an accident. Only operate these devices if road traffic con- ditions permit. If you are unsure about the surrounding conditions, pull over to a safe location and make entries only while the vehi- cle is stationary. G WARNING If the instrument cluster has failed or mal- functioned, you may not recognise function restrictions relevant to safety. The operating safety of your vehicle may be impaired. There is a risk of an accident. Drive on carefully. Have the vehicle checked at a qualified specialist workshop immedi- ately.
times. Otherwise, a vehicle that is not oper- ating safely may cause an accident. For an overview, see the instrument panel illustration (Y page 30).
Displays and operation Instrument cluster lighting The lighting in the instrument cluster, in the displays and the controls in the vehicle inte- rior can be adjusted using the brightness con- trol knob. The brightness control knob is on the bottom left of the instrument cluster (Y page 30). X Turn the brightness control knob clockwise
or anti-clockwise. If the light switch is set to Ã, T or L, the brightness is dependant upon the brightness of the ambient light.
i The light sensor in the instrument cluster
automatically controls the brightness of the multifunction display. In daylight, the displays in the instrument cluster are not illuminated.
Coolant temperature gauge The coolant temperature gauge is in the instrument cluster on the right-hand side. The reading may rise up to 120 † below nor- mal driving conditions if the coolant has been filled correctly. At high outside temperatures and when driv-
