The sensor is a component of the ACC » page 214 and Front Assist
» page 219 systems.
The sensor function may be impaired in the events of one of the following. ▶ The sensor cover is soiled (e.g. with mud, snow etc.).
▶ The area in front of and around the sensor cover is obscured (e.g. by labels,
auxiliary headlights etc.).
▶ When visibility is poor, (e.g. fog, heavy rain, thick snowfall).
If the sensor is covered or dirty, the corresponding message appears in the in-
strument cluster display for the ACC system » page 218, Malfunctions or Front
Assist system » page 221, Malfunctions .WARNING■
If you suspect that the sensor is damaged, deactivate the ACC system and
Front Assist system » page 216» page 220 . Have the sensor checked by a
specialist garage.■
A collision or damage in the front or lower area of the vehicle could affect
the sensor function - there is risk of accident! Have the sensor checked by
a specialist garage.
■
Do not cover the area in front of and around the sensor cover. This can
lead to impaired function of the sensor - risk of accidents!
CAUTION
Remove the snow with a brush and the ice with a solvent-free de-icer.
Braking and stabilisation systems
Introduction
This chapter contains information on the following subjects:
Stability Control (ESC)
200
ESC Sport
200
Anti-lock braking system (ABS)
201
Engine drag torque control (MSR)
201
Traction control (TCS)
201
Electronic Differential Lock (EDL and XDS)
201
Active steering assist (DSR)
202
Brake Assist (HBA)
202
Hill Start Assist (HHC)
202Multicollision brake (MCB)202Trailer stabilisation system (TSA)202
The brake and stabilization systems are automatically activated each time the
ignition is switched on, unless otherwise indicated.
The error display is in Chapter » page 32, Warning lights .
WARNINGThe general information relating to the use of assistance systems must be
observed » page 199, in section Introduction .
Stability Control (ESC)
Read and observe
on page 200 first.
ESC improves vehicle stability in critical driving situations (e.g. if the vehicle
starts to skid) by the braking the individual wheels to maintain the direction.
If there is a TCS intervention, the indicator light flashes in the instrument
cluster.
ESC Sport
Read and observe
on page 200 first.
ESC Sport allows for a sportier driving style. With ESC Sport activated, no ESC
intervention takes place when the vehicle slightly oversteers and understeers,
and ASR is so limited that the drive wheels can be spun.
Activation
›
Press and hold down the
» Fig. 241 on page 201 button.
›
or: On Infotainment, press the button
→ Press the function area
→
ESC system:
→
ESC Sport
.
With activation the warning light
lights up in the instrument cluster and an
appropriate message is displayed in the instrument cluster.
Deactivation
›
Press the
» Fig. 241 on page 201 button.
›
or: On Infotainment, press the button
→ Press the function area
→
ESC system:
→
Activated
.
With deactivation the warning light extinguishes in the instrument cluster
and an appropriate message is displayed in the instrument cluster.
200Driving
Anti-lock braking system (ABS)Read and observe
on page 200 first.
ABS prevents the wheels locking when braking. Thus helping the driver to
maintain control of the vehicle.
The intervention of the ABS is noticeable from the pulsating movements of
the brake pedal which is accompanied by noises.
When the ABS system is active, do not brake periodically or reduce the pres-
sure on the brake pedal.
Engine drag torque control (MSR)
Read and observe
on page 200 first.
MSR counteracts the tendency of the drive wheels to lock during downshifts
or sudden deceleration (e.g. on icy or an otherwise slippery road surface).
If the drive wheels should lock, then the engine speed is automatically in-
creased. This reduces the braking effect of the engine and the wheels can ro-
tate freely again.
Traction control (TCS)
Fig. 241
System button: Vehicle with ESC / vehicle without ESC
Read and observe
on page 200 first.
The ASR prevents spinning of the drive wheels. TCS reduces the drive power transmitted to the wheels in the case of slipping wheels. Thus, for example,
driving on road surfaces with low grip is made easier.
During a TCS intervention, the indicator light flashes in the instrument clus-
ter.
Deactivation›
Press the
» Fig. 241 button.
›
or:press the button
» Fig. 241
›
or: On Infotainment, press the button
→ Press the function area
→
ESC system:
→
ASR off
.
During deactivation the warning light lights up in the instrument cluster
and
an appropriate message is displayed in the instrument cluster.
Activation
›
Press the
» Fig. 241 button.
›
or:press the button
» Fig. 241
›
or: On Infotainment, press the button
→ Press the function area
→
ESC system:
→
Activated
.
During activation extinguished the warning light
is and an appropriate mes-
sage is displayed in the instrument cluster.
The TCS should normally always be enabled. The system should be deactivated
only in the following situations, for example. ▶ When driving with snow chains.
▶ When driving in deep snow or on a very loose surface.
▶ When it is necessary to “rock” a car free when it has become stuck.
Note
On vehicles without the ESC system, the warning light does not illuminate
upon deactivation of the TCS system, but a message is only displayed on the
display of the instrument cluster.
Electronic Differential Lock (EDL and XDS)
Read and observe
on page 200 first.
EDL prevents the turning of the respective wheel of the driven axle. EDL
brakes a spinning wheel if required and transfers the drive power force to the
other drive wheel. Driving becomes easier on road surfaces with different trac-
tion under each wheel of the driven axle.
EDL switches off automatically to avoid excessive heat generation on the
brake of the wheel being braked. Once the brakes have cooled down, there is
an automatic re-activation of EDL.
201Assist systems
›Jack up the vehicle
» page 269 until the wheel that needs changing is clear of
the ground.›
Unscrew the wheel bolts and place them on a clean surface (cloth, paper,
etc.).
›
Remove the wheel carefully.
›
Attach the spare wheel and slightly screw on the wheel bolts.
›
Lower the vehicle.
›
Tighten the wheel bolts opposite each other using the wheel wrench (“pull- ing crossways”) » page 269.
›
Replace the wheel trim » page 267and caps» page 268 .
When fitting a wheel with unidirectional tyres, ensure that the direction of ro-
tation is correct » page 261.
All bolts must be clean and must turn easily. If screws are corroded and diffi-
cult to move, these must be replaced.
WARNING■ Undo the wheel bolts just a little (about one turn), provided the vehicle
has not yet been jacked up. Otherwise the wheel could come loose and fall
off – There is a risk of an injury.■
Under no circumstances must the bolts be greased or oiled - There is a
risk of an accident.
Subsequent steps
After changing the wheel, the following work must be carried out.
›
Stow the replaced wheel in the well under the floor covering of the luggage
compartment and secure with a locking screw.
›
Stow the tool kit in the space provided and secure using the band.
›
Check tyre pressure on the mounted wheel and adjust if necessary and, with
vehicles with tyre pressure monitoring, save the tyre pressure values in the
system » page 229 .
›
Have the tightening torque of the wheel bolts checked as soon as possible.
The prescribed tightening torque is 120 Nm.
Replace the damaged wheel or consult a specialist garage about repair op-
tions.
WARNINGTightening torque which is too high can damage the threads and this can
result in permanent deformation of the contact surfaces on the rim. Where
tightening torque is too low, the wheels may become loose while driving -
risk of accident. Therefore drive cautiously and only at a moderate speed
until the tightening torque has been checked.
Removing/stowing the emergency or spare wheel
Fig. 303
Take out the wheel
The wheel is located in a well under the floor covering in the boot and is fixed
in place with special bolt
B
» Fig. 303 .
Take out the wheel
›
Lift up the floor in the luggage compartment.
›
Loosen the retaining belt and take out the box with the tool kit.
›
Remove locking
A
in the direction of arrow
1
» Fig. 303 .
›
Unscrew the screw
B
in direction of arrow
2
and remove the wheel.
Store wheel away
›
Place the wheel into the wheel well with the wheel rim pointing downward.
›
Pull the fixing band through the opposite holes in the wheel rim.
›
Screw in nut
B
in the opposite direction to arrow
2
» Fig. 303 .
›
Insert locking
A
in the opposite direction to which arrow
1
is pointing.
›
Place the box with the tool kit back inside the wheel and secure it with the
tape.
›
Fold back the floor in the luggage compartment.
Full wheel trim
Remove trim
›
Hang the clamps for removing the full wheel trims on the edge of the full
wheel trim.
267Emergency equipment, and self-help