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* Option/accessory, for more information, see Introduction.
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Active chassis * (Four C)
Active chassis, Four-C (Continuously Controlled Chassis Concept), regulates the characteristicsof the shock absorbers so that the vehicle's driv-ing characteristics can be adjusted. There arethree settings: Comfort, Sport and Advanced.
Operation
Chassis settings
Use the buttons in the center console to change setting. The setting in use when the engine isswitched off is activated the next time the engineis started.
Comfort
Comfort mode offers a somewhat softer ride and the transmission shifts gears at lower rpm. Thismode is particularly suitable for long-distancehighway driving. The indicator light in the buttonwill be on when this mode is selected.
Sport
In this mode, the vehicle's body sway is reduced during cornering and steering response is moreimmediate. The transmission shifts up at higherrpm for sportier driving. The indicator light in thebutton will be on to indicate that Sport mode hasbeen selected.
Advanced
In this mode, body sway in curves is minimal and steering response is very direct. Gear shifting isdone at high rpm in each gear for dynamic andactive driving.
Related information
• Adjustable steering force
* (p. 171)
Stability system – introduction The Electronic Stability Control (ESC) system consists of a number of functions designed tohelp reduce wheel spin, counteract skidding andto generally help improve directional stability.
A pulsating sound will be audible when the system is actively operating and isnormal. Acceleration will also beslightly slower than normal.
WARNING
ESC is a supplementary aid and cannot deal with all situations or road conditions. The driver is always responsible for operating the vehicle in a safe manner in accordancewith current traffic regulations.
ESC consists of the following functions: • Traction control
• Spin control
• Active Yaw Control
• Engine Drag Control
• Corner Traction Control
Traction Control (TC)
This function is designed to help reduce wheel spin at low speeds by transferring power from adrive wheel that begins to lose traction to thewheel on the opposite side of the vehicle (on thesame axle).
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Spin Control (SC)
The SC function is designed to help prevent the drive wheels from spinning while the vehicle isaccelerating.
Active Yaw Control (AYC)
This function helps maintain directional stability, for example when cornering, by braking one ormore of the wheels if the vehicle shows a ten-dency to skid or slide laterally.
Corner Traction Control (CTC)
CTC compensates for understeering and helps provide additional stability when acceleratingthrough a curve by preventing the inside wheelfrom spinning. This is particularly useful whenaccelerating on a curving highway on-ramp. CTC is most effective if the stability system's Sport mode is selected. See the section about
Sport mode.
Engine Drag Control (EDC)
EDC helps keep the engine running if the wheels show a tendency to lock, e.g., when shifting downin the Geartronic manual shifting mode or whileusing the engine's braking function on a slipperysurface. If the engine were to stop, power steer-ing would not function, making the vehicle moredifficult to steer.
Trailer Stability Assist (TSA)
The TSA helps stabilize a vehicle that is towing a trailer when the vehicle and trailer have begun tosway. See Trailer Stability Assist (TSA) (p. 287)for more information. This system is automatically deactivated if the driver selects
Sport mode.
Related information
•Stability system – operation (p. 167)
• Stability system – symbols and messages (p. 169)
• Trailer Stability Assist (TSA) (p. 287)
Stability system – operation
Operation
Sport mode
The stability system is always activated and can- not be switched off.
However, the driver can select Sport mode, which offers more
active driving characteristics. Sport mode can be selected in
the MY CAR menus, see My Car – introduction (p. 71).
In Sport mode, the engine management system
monitors movement of the accelerator pedal and steering wheel for sportier driving by allowingmore lateral movement of the rear wheels beforeESC is activated. Under certain circumstances, such as when driv- ing with snow chains, or driving in deep snow orloose sand, it may be advisable to temporarily use Sport mode for maximum tractive force.
If the driver releases pressure on the accelerator pedal, ETC will also activate to help stabilize thevehicle. To switch to Sport mode:
Sport mode remains active until the driver
switches it off in the menu or until the engine is switched off. ETC will return to normal modewhen the engine is restarted.
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SymbolMessageDescription
Flashing symbol.ESC is actively functioning to help counteract wheel spin and/or a skid.
Steady glow.Sport mode has been activated.
Please note that ESC is not deactivated at this time but its functionality is reduced.
WARNING
The stability system is intended to help improve driving safety. It supplements, but cannever replace, the driver's judgment andresponsibility when operating the vehicle.Speed and driving style should always beadapted to traffic and road conditions.
Related information
• Stability system – introduction (p. 166)
• Stability system – operation (p. 167)
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* Option/accessory, for more information, see Introduction.171
Adjustable steering force*
Steering force increases with the speed of the vehicle to give the driver enhanced sense ofcontrol and stability. At low speed the vehicle iseasy to steer in order to facilitate parking, etc.
Adjustable steering force *Steering force can be changed under MY CAR
Car settingsSteering wheel force.
Select Low, Medium or High. For a description
of the menu system, My Car – introduction (p. 71).
NOTE
This steering force level menu function can- not be accessed when the vehicle is inmotion.
NOTE
In certain situations, the power steering may become too warm and will have to be tempo-rarily cooled down. While this is happening,the power steering effect will be reducedslightly and somewhat more effort may berequired to turn the steering wheel. If this occurs, a message will be displayed in the instrument panel.
Related information
• Active chassis
* (Four C) (p. 166)
Road Sign Information (RSI) * –
introduction
RSI is a feature that helps the driver see road signs with the posted speed limit.
Introduction
Examples of readable road signs
If the vehicle passes a sign showing the speed limit, this will be displayed in the center console.
WARNING
RSI does not function in all situations and is only intended to provide supplementary infor-mation. The driver is always responsible for operating the vehicle safely.
Related information
• Road Sign Information (RSI) – operation (p. 172)
• Road Sign Information (RSI) – limitations(p. 172)
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Cruise control (CC) – introductionCruise control is designed to assist the driver by maintaining a set speed. It is primarily intendedfor use on long straight roads in steady traffic,such as on highways and other main roads.
Operation
Steering wheel-mounted controls and display
Standby mode
Resume set speed
Deactivating
Activate/set speed
Selected speed ( gray symbol indicates
standby mode)
Cruise control active: white symbol ( gray
symbol indicates standby mode)
Related information
• Cruise control (CC) – engaging and setting speed (p. 173)
• Cruise control (CC) – deactivating (p. 175)
Cruise control (CC) – engaging and setting speed
Cruise control is designed to assist the driver by maintaining a set speed. It is primarily intendedfor use on long straight roads in steady traffic,such as on highways and other main roads.
Engaging the cruise control function
Steering wheel-mounted controls and display
Standby mode
Resume set speed
Deactivating
Activate/set speed
Selected speed ( gray symbol indicates
standby mode)
Cruise control active: white symbol ( gray
symbol indicates standby mode)
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the previous section "Turning ACC off com- pletely." The next time the system is switched on,ACC will be reactivated.
Related information
•
Adaptive Cruise Control – introduction(p. 176)
• Adaptive Cruise Control – function (p. 177)
Cruise control (CC) – deactivating Cruise control is designed to assist the driver by maintaining a set speed. It is primarily intendedfor use on long straight roads in steady traffic,such as on highways and other main roads.
Automatic deactivationThe cruise control is automatically deactivated temporarily
if one of the following occurs:
• If the speed drops below approximately 20 mph (30 km/h).
• When the brake pedal is depressed.
• If the gear selector is moved to position
N.
• During wheel spin or wheel lock-up.
• If the vehicle's speed is increased by usingthe accelerator pedal for more than 1 minute.
• Engine speed (rpm) is too high or too low.
The currently set speed will be saved in the sys-tem's memory.
Temporary deactivationThe driver can temporarily deactivate the cruise control by pressing 0. The saved speed is shown
in brackets in the information display.
Resume set speedIf the cruise control has been deactivated tempo- rarily, it can be reactivated by pressing
. The
vehicle's speed returns to the most recently set speed.
WARNING
There may be a significant increase in speed after the
button has been pressed.
Deactivation
The Cruise control is disengaged by pressing or by switching off the engine. The set speed is cleared.
WARNING
Cruise control should not be used in heavy traffic or when driving on wet or slipperyroads. Cruise control may not maintain setspeed on steep downgrades.
Related information
• Cruise control (CC) – introduction (p. 173)
• Cruise control (CC) – engaging and setting speed (p. 173)
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Radar sensor type approval
USA FCC ID: L2C0038TR Canada IC: 3432A-0038TR This device complies with Part 15 of the FCC Rules and with Industry Canada license-exemptRSS standard(s). Operation is subject to the fol-lowing two conditions: (1) This device may notcause harmful interference, and (2) This devicemust accept any interference received, includinginterference that may cause undesired operation. The term “IC:” before the radio certification num- ber only signifies that Industry Canada technicalspecifications were met.
WARNING
Changes or modifications not expressively approved by the party responsible for compli-ance could void the user's authority to oper-ate the equipment.
Related information
•Toggling between ACC and CC (standard Cruise Control) (p. 174)
• Cruise control (CC) – introduction (p. 173)
• Adaptive Cruise Control – troubleshooting(p. 190) •
Adaptive Cruise Control – symbols and mes-sages (p. 188)
• Adaptive Cruise Control – setting time inter-val (p. 181)
• Adaptive Cruise Control – setting speed(p. 180)
• Radar sensor (p. 185)
• Adaptive Cruise Control (ACC) – QueueAssist (p. 183)
• Adaptive Cruise Control – passing anothervehicle (p. 183)
• Adaptive Cruise Control – limitations(p. 186)
• Adaptive Cruise Control – function (p. 177)
• Adaptive Cruise Control – engaging (p. 179)
• Adaptive Cruise Control – deactivating(p. 181)
Adaptive Cruise Control – function
Function
Function overview 1
Warning light, braking by driver required
Controls in steering wheel
Radar sensor in front grille
Adaptive Cruise Control consists of:
• A cruise control system to maintain a set speed
• A system to maintain a set distance to thevehicle ahead, which is expressed as a timeinterval. For example, you can choose toremain approximately 2 seconds behind thevehicle ahead. The actual distance required
1
The illustration is generic; details will vary, depending on the model
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WARNING
The vehicle may accelerate quickly after has been pressed if its current speed is con- siderably lower than the set speed.
Standby mode due to action by the driver
ACC is temporarily deactivated and put in standby mode:• if the brakes are applied
• if the gear selector is moved to
N
• if the driver drives faster than the set speed for more than
1 minute.
In this happens, the driver will have to regulate
the vehicle's speed.
NOTE
If the accelerator pedal is only depressed for a short time, such as when passing anothervehicle, ACC is deactivated temporarily and isreactivated when the pedal is released.
Automatic standby modeACC is linked to other systems such as the sta- bility system. If this system is not functioningproperly, ACC will switch off automatically. In the event of automatic deactivation, an audible signal will sound and the message
Cruise control Cancelled
is shown in the instrument
panel. The driver must then intervene and adapt the vehicle's speed to the surrounding traffic andregulate the distance to the vehicle ahead. An automatic switch to standby mode may be caused if:
• engine speed (rpm) is too high/low
• The driver's door is opened
• The driver unbuckles his/her seat belt
• the vehicle's speed goes below 18 mph(30 km/h)
• the wheels lose traction
• brake temperature is high
• the radar sensor is obstructed by, for exam-ple, wet snow or rain.
Resuming the set speedIf ACC is in standby mode, it can be reactivated by pressing the
button on the steering wheel
keypad. The vehicle will return to the most recently set speed.
WARNING
The vehicle may accelerate quickly after has been pressed if its current speed is con- siderably lower than the set speed.
Turning ACC off completely
Controls and display
Resume previous settings.
Off/On/Standby mode
• From standby mode, press (2)
once.
• From active mode, press (2)
twice.
The set speed and time interval are then cleared from the system's memory and cannot be resumed by pressing (1)
.
Related information
• Adaptive Cruise Control – introduction (p. 176)