DRIVER SUPPORT
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If Pilot Assist detects that thedriver's hands are not on thesteering wheel, a symbol andtext message will appear toinstruct the driver to activelysteer the vehicle.
If the driver's hands are still detected on thesteering wheel after a few seconds have passed,the instructions to actively steer the vehicle willbe repeated, accompanied by an audible signal.
If Pilot Assist still does not detect the driver'shands on the steering wheel after a few moreseconds have passed, the audible signal willbecome intense and the steering function willswitch off. Pilot Assist must then be reactivated
by pressing the button on the steeringwheel.
NOTE
Note that the Pilot Assist function only workswhen the driver's hands are on the steeringwheel.
Related information
Pilot Assist (p. 281)
Deactivating/reactivating Pilot Assist(p. 285)
Deactivating/reactivating PilotAssist
Pilot Assist can be temporarily put into standbymode and then reactivated.
Deactivating and putting Pilot Assist in
standby mode
Note: This illustration is general and details may varydepending on model.
To temporarily deactivate Pilot Assist and put it instandby mode:
–Press the button on the steering wheel(2).
>Pilot Assist goes into standby mode - thesymbol (8) in the instrument panelchanges color from WHITE to GRAY andthe set speed in the center of the speed-ometer will change from BEIGE to GRAY.
...or...
–Press the ◀ button on the steering wheel (3).
>Pilot Assist is turned off and AdaptiveCruise Control will go into active mode.
WARNING
With Pilot Assist in standby mode, thedriver must intervene and steer and regu-late both speed and distance to the vehi-cle ahead.
If the vehicle comes too close to a vehicleahead when Pilot Assist is in standbymode, the driver is instead warned of theshort distance by the Distance Alert*function.
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Standby mode due to action by the driver
Pilot Assist will be temporarily deactivated andput in standby mode if:
the brakes are applied.
the gear selector is moved to N.
a turn signal is used for more than 1 minute.
the vehicle is driven faster than the setspeed for more than 1 minute.
Temporarily increasing speed using the accelera-tor pedal, e.g. when passing another vehicle, willnot affect the setting. The vehicle will return tothe set speed when the accelerator pedal isreleased.
When the turn signals are used, Pilot Assist'ssteering assistance will be temporarily deacti-vated. When the turn signal is switched off, steer-ing assistance will be automatically reactivated ifthe traffic lane's side markings can still bedetected.
Automatic standby mode
Pilot Assist is dependent on other systems, such
as Electronic Stability Control (ESC32). If any ofthese other systems stops working, Pilot Assistwill automatically switch off.
WARNING
With automatic standby mode, the driver iswarned by an acoustic signal and a messageon the instrument panel.
The driver must then regulate vehiclespeed, apply the brakes if necessary, andmaintain a safe distance to other vehicles.
Adaptive Cruise Control may go into standbymode if, e.g.:
the driver opens the door.
the brake temperature is high.
the driver's hands are not on the steeringwheel.
the parking brake is applied.
the engine speed (rpm) is too low/high.
the driver unbuckles the seat belt.
one or more of the wheels lose traction.
the camera/radar sensor is covered by snowor heavy rain (the camera lens/radar wavesare blocked).
your vehicle's speed goes under 5 km/h(3 mph) and Pilot Assist cannot determine ifthe vehicle ahead is stationary or if it isanother object, e.g. a speed bump.
your vehicle's speed goes under 5 km/h(3 mph) and the vehicle ahead turns so thatPilot Assist no longer has a vehicle to follow.
Reactivating Pilot Assist from standby
mode
Note: This illustration is general and details may varydepending on model.
To reactivate Pilot Assist:
–Press the button on the steering wheel(1).
>Speed will be set to the most recentlystored speed.
32Electronic Stability Control
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The previous illustration34 shows that Pilot Assistis set to maintain a speed of 110 km/h (68 mph)and that there is no target vehicle ahead to fol-low.
Pilot Assist will provide steering assistancebecause it can detect the lane's side markinglines.
Related information
Pilot Assist (p. 281)
Collision risk warning from driversupport
The driver support systems Pilot Assist and
Adaptive Cruise Control*35 can help alert thedriver if the distance to the vehicle ahead sud-denly decreases to an unsafe distance.
Collision warning audible signal and symbol.
Acoustic collision warning signal
Collision warning symbol
Camera/radar sensor distance monitoring
Driver support uses approx. 40% of the vehicle'sbraking capacity. If a situation requires morebraking force than driver support can provide, andif the driver does not apply the brakes, a warning
light and audible warning signal will be activatedto alert the driver that immediate action isrequired.
WARNING
The driver support system only issues a warn-ing for vehicles detected by its radar unit –thus, a warning may come after a delay or notat all. Never wait for a warning. Apply thebrakes when necessary.
Collision warning symbol on the windshield.
In vehicles equipped with a head-up display*, aflashing warning symbol will be displayed on thewindshield.
34Note: This illustration is general and details may vary depending on model.35Adaptive Cruise Control
DRIVER SUPPORT
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NOTE
Visual warnings on the windshield may be dif-ficult to notice in cases of strong sunlight,reflections, extreme light contrasts, or if thedriver is wearing sunglasses or is not lookingstraight ahead.
Related information
Driver support systems (p. 260)
Adaptive Cruise Control* (p. 272)
Pilot Assist (p. 281)
Distance Alert* (p. 270)
Head-up display* (p. 140)
Switching target vehicles with driversupport
At certain speeds, vehicles with automatic trans-missions and the driver support functions Adap-
tive Cruise Control*36 and Pilot Assist canswitch target vehicles.
Switching target vehicles
If the target vehicle ahead turns suddenly, there may bestationary traffic ahead.
When driver support is actively following anothervehicle at speeds under 30 km/h (20 mph) andswitches targets from a moving vehicle to a sta-tionary vehicle, driver support will brake for thestationary vehicle.
WARNING
When driver support follows another vehicle atspeeds over approx. 30 km/h (20 mph) andchanges target vehicle – from a moving vehi-cle to a stationary one – driver support willignore the stationary vehicle and insteadaccelerate to the stored speed.
The driver must then intervene and applythe brakes.
Automatic standby mode when switching
targets
Driver support disengages and goes into standbymode if:
your vehicle's speed goes under 5 km/h(3 mph) and driver support cannot determineif the target vehicle is stationary or if it isanother object, e.g. a speed bump.
your vehicle's speed goes under 5 km/h(3 mph) and the vehicle ahead turns so thatdriver support no longer has a vehicle to fol-low.
Related information
Driver support systems (p. 260)
Adaptive Cruise Control* (p. 272)
Pilot Assist (p. 281)
36Adaptive Cruise Control
DRIVER SUPPORT
* Option/accessory.292
Set time interval for driver support
The time interval to the vehicle ahead can be set
for the functions Adaptive Cruise Control*37,Pilot Assist and Distance Alert*.
Different time intervals to thevehicle ahead can be selectedand are shown in the instru-ment panel as 1–5 horizontalbars. The more bars, the longerthe time interval. One bar rep-resents an interval ofapprox. 1 second to the vehicle ahead. 5 barsrepresents approx. 3 seconds.
NOTE
When the symbol in the instrument panelshows a vehicle and a steering wheel, PilotAssist follows a vehicle ahead at a presettime interval.
When only a steering wheel is shown, there isno vehicle ahead within a reasonable dis-tance.
NOTE
When the symbol in the instrument panelshows two vehicles, ACC is following the vehi-cle ahead at a preset time interval.
When only one vehicle is shown, there is novehicle ahead within a reasonable distance.
Controls for setting a time interval.
Reduce the time interval
Increase the time interval
Distance indicator
–Press the (1) or (2) button to decrease orincrease the time interval.
>The distance indicator (3) shows the cur-rent time interval.
In order to help your vehicle follow the vehicleahead as smoothly and comfortably as possible,Adaptive Cruise Control allows the time intervalto vary noticeably in certain situations. At lowspeeds, when the distance to the vehicle aheadis short, Adaptive Cruise Control increases thetime interval slightly.
NOTE
The greater the vehicles' speed, thegreater the distance between them for aset time interval.
Only use the time intervals permitted bylocal traffic regulations.
If driver support does not seem torespond with a speed increase when acti-vated, it may be because the time intervalto the vehicle ahead is shorter than theset time interval.
WARNING
Only use a time interval suitable for thecurrent traffic conditions.
The driver should be aware that shorttime intervals give them limited time toreact and act to any unforeseen trafficsituation.
37Adaptive Cruise Control
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Related information
Driver support systems (p. 260)
Adaptive Cruise Control* (p. 272)
Pilot Assist (p. 281)
Distance Alert* (p. 270)
Head-up display* (p. 140)
Drive mode for driver support
The driver can choose different drive modes todetermine how driver support should maintain atime interval to the vehicle ahead.
Settings are made using the DRIVE MODE con-trols.
Select one of the following:
Pure - Driver support will focus on providingoptimal fuel economy, which will increase thetime interval to the vehicle ahead.
Hybrid - Driver support will focus on follow-ing the set time interval to the vehicle aheadas smoothly as possible.
Power - Driver support will focus on follow-ing the set time interval to the vehicle aheadmore exactly, which could mean faster accel-eration and heavier braking.
Related information
Driver support systems (p. 260)
Drive modes (p. 412)
Adjusting set speed for driversupport
It is possible to adjust set speeds for the SpeedLimiter, Cruise Control, Adaptive Cruise Con-
trol*38 and Pilot Assist functions.
: Increases the set speed.
: Reduces the set speed.
Set speed.
38Adaptive Cruise Control
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–Change a set speed by pressing the (1)
or (2) buttons briefly or by pressing andholding them:
Brief press: Each press changes thespeed in +/- 5 km/h (+/- 5 mph) incre-ments.
Press and hold: Release the button whenthe set speed indicator (3) has moved tothe desired speed.
NOTE
For vehicles without Adaptive Cruise Control*,speed instead increases by +/- 1km/h(+/- 1 mph) each time the button is pressed.
The most recently set speed will be stored.
If speed is increased by depressing the accelera-
tor pedal while pressing the (1) button onthe steering wheel, the vehicle's speed when thebutton is pressed will be stored as the set speed.
Temporarily increasing speed using the accelera-tor pedal, e.g. when passing another vehicle, willnot affect the setting. The vehicle will return tothe set speed when the accelerator pedal isreleased.
Automatic transmission
The driver support functions can follow anothervehicle at speeds from a standstill up to200 km/h (125 mph).
Pilot Assist can provide steering assistance fromnear-stationary speeds up to 140 km/h(87 mph).
The lowest speed that can be set is 30 km/h(20 mph). When following another vehicle, ACCcan monitor that vehicle's speed and slow yourown vehicle down to a standstill, but it is not pos-sible to set speeds lower than 30 km/h(20 mph).
Related information
Driver support systems (p. 260)
Cruise control (p. 266)
Adaptive Cruise Control* (p. 272)
Pilot Assist (p. 281)
Auto-hold braking with driversupport
Pilot Assist and Adaptive Cruise Control*
(ACC39) have a special brake function in slowtraffic and while stationary.
Braking function in slow traffic and at a
standstill
In slow-moving, stop-and-go traffic or when stop-ped at a traffic light, driving will resume automati-cally if the vehicle is stopped for less thanapprox. 3 seconds. If it takes more than 3 sec-onds for the vehicle ahead to begin moving again,the driver support function will go into standbymode and the auto-hold brake function will acti-vate.
–The function can be reactivated by:
Pressing the button on the steeringwheel keypad.
Pressing the accelerator pedal.
>The function will resume following thevehicle ahead if it begins to move withinapprox. 6 seconds.
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NOTE
Driver support can keep the vehicle stationaryfor no more than 5 minutes – after that timethe parking brake is applied and the functionis deactivated.
The parking brake must be released beforedriver support can be reactivated.
Deactivation of the Auto-hold brake function
In certain situations, auto-hold will be deactivatedwhen the vehicle is at a standstill and the func-tion will go into standby mode. This means thatthe brakes will be released and the vehicle couldbegin to roll. The driver must actively apply thebrakes to keep the vehicle stationary.
This can occur if:
the driver depresses the brake pedal
the parking brake is applied
the gear selector is moved to the P, N or Rpositions
the driver puts the function in standby mode.
Auto Activate Parking Brake
In certain situations, the parking brake will beapplied to keep the vehicle at a standstill.
This occurs if the function is keeping the vehiclestationary using the brakes and:
the driver opens the door or unbuckleshis/her seat belt
the function has kept the vehicle at a stand-still for more than approx. 5 minutes
the brakes overheat
the driver switches off the engine manually.
Related information
Driver support systems (p. 260)
Adaptive Cruise Control* (p. 272)
Pilot Assist (p. 281)
Brake functions (p. 396)
Passing assistance
Passing assistance can assist the driver whenpassing other vehicles. The function can beused with Pilot Assist or Adaptive Cruise Con-
trol* (ACC40).
How passing assistance works
When Pilot Assist or ACC is following anothervehicle and you indicate that you intend to pass
that vehicle by using the turn signal41, the systemwill begin accelerating toward the vehicle aheadbefore your vehicle has moved into the passinglane.
The function will then delay a speed reduction toavoid early braking as your vehicle approaches aslower-moving vehicle.
The function remains active until your vehicle haspassed the other vehicle.
WARNING
Please note that this function can be acti-vated in more situations than just passinganother vehicle, such as when a direction indi-cator is used to indicate a lane change orbefore exiting to another road – the vehiclewill then briefly accelerate.
39Adaptive Cruise Control40Adaptive Cruise Control41Only the left-hand turn signal for left-hand drive vehicles, or right-hand turn signal for right-hand drive vehicles.