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Driving175
Safety First
Operating instructions
Tips and Maintenance
Te c h n i c a l D a t a
Cruise control system (CCS)Cruise control operation
The cruise control system(CCS) is able to maintain the set
speed in the range from approx. 30 km/h to 180 km/h.Once the desired speed has been reached and the setting stored, you may
take your foot off the accelerator.
In vehicles fitted with a manual gearbox and in vehicles with an automatic
gearbox with the lever in positions P, N or R the cruise control does not
operate in first gear.
WARNING
It could be dangerous to use the cruise control system (CCS) if it is not
possible to drive at constant speed.•
Do not use the cruise control in heavy traffic or on steep roads, with
several bends or in slippery circumstances (snow, ice, rain or loose gravel),
as there is a risk of accident.
•
Always adapt your speed and the dist ance to the vehicles ahead to take
the traffic situation into consideration. This is the duty of the driver. The
cruise control system is merely an aid to the driver.
•
Never use the cruise control system when driving off-road or on
unpaved roads. This feature is designed for use on paved roads only. Risk
of accident.
•
Always switch off the CCS when you have finished using it. This will
prevent you using it by mistake.
•
It is dangerous to use a set speed wh ich is too high for the prevailing
road, traffic or weather conditions. This may cause an accident.
Caution
if the cruise control is activated the gearbox should not be set in neutral
without first releasing the clutch, as the the engine speed will increase and
this may cause damage.
Note
When travelling down hills, the CCS cannot maintain a constant speed. The
vehicle will accelerate under its own weight. Reduce gears (with an automatic
gearbox, reduce gears using the “Tiptronic”) or brake using the footbrake.
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Driving
176Lever for cruise control
The CCS can be operated using the controls on the turn signal
lever or on the multi-function steering wheel.
Switching on the system
– Move the control ⇒fig. 133 to the left to ON. The
symbol
lights up in the combi-instrument when the cruise control system
is switched on.
Switching off system
– Move the control ⇒fig. 133 to the right to OFF or press the
key ⇒fig. 134 once.
Setting speed
–Press the lower part SET of the rocker switch ⇒fig. 133 once
briefly when you have reached the speed you wish to set
⇒ fig. 134 . This speed is then stored and maintained.
Increasing the stored speed
– To reach the desired speed hold down the upper part of the rocker button ⇒fig. 133 or button ⇒fig. 134 .
Reducing the set speed
– To reach the desired speed hold down the lower part of the rocker button ⇒fig. 133 or button ⇒fig. 134 . The speed
falls as the vehicle is no longer accelerating, not due to sharp
braking.
If you increase speed by using the accelerator, the previously programmed
speed will be resumed when the accelerator pedal is released. This will not be
the case, however, if the vehicle speed is more than 10 km/h higher than the
stored speed for longer than 5 minutes. The speed will have to be stored
again.
Fig. 133 Turn signal and
main beam lever: switch and rocker switch
for CCS.AA
AB
Fig. 134 Multi-function
steering wheel: CCS
controls
ABAA
AB
- +
AB
+
-
AB
-
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Driving177
Safety First
Operating instructions
Tips and Maintenance
Te c h n i c a l D a t a
Control of the set speed is switched off if you reduce speed by depressing the
brake pedal. You can reactivate the control by pressing once on the upper part
of the rocker switch or button .
WARNING
It is dangerous to use a set speed whic
h is too high for the prevailing road,
traffic or weather conditions. This may cause an accident.Switching off system temporarilySwitching off the control temporarily in vehicles with a manual
gearbox
– Depress the brake or clutch pedal or
–Push the switch ⇒page 176, fig. 133 to “OFF”, or
– Press the lower part of the button .
Switching off the control temporaril y in vehicles with an automatic
gearbox
– Press the brake pedal or
– Select positions N or 1 or
–Push the switch ⇒page 176, fig. 133 to “OFF”, or
– Press the lower part of the rocker button .The speed stored will remain in the memory if the control is switched off
temporarily, unless you select positions N or 1. In this case, the speed stored
in the memory will be deleted. To resume the control function, release the brake or clutch pedal, move the
switch to ON or press the button
⇒page 176, fig. 133 or button
⇒ page 176, fig. 134 once.
WARNING
It is dangerous to use a set speed whic h is too high for the current road,
traffic or weather conditions. Risk of accident.
+
AA
CANCEL
AACANCEL
AA
+
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Intelligent technology179
Safety First
Operating instructions
Tips and Maintenance
Te c h n i c a l D a t a
Tips and MaintenanceIntelligent technologyBrakesBrake servoThe brake servo supplements the pressure you exert on the brake pedal. It
works only when the engine is running .
If the brake servo does not operate, for example, when the vehicle is being
towed or due to a fault in the system, the brake pedal must be depressed
harder.
WARNING
The braking distance can also be affected by external factors.•
Never let the vehicle coast with the engine switched off. Failure to do so
could result in an accident. The braking distance is increased considerably
as the brake servo does not function.
•
If the brake servo is out of action, for example if the car is being towed,
you will have to press the brake pedal considerably harder than normal.
Brake pads wear display
If this light comes on, check the brake pads immediately.
At the same time, a text message or the necessary operations may appear on
the instrument panel.
WARNING
If the warning lamp lights up
or the corresponding message appears on
the instrument panel, immediately have the brake pads checked and
replaced, if necessary, at a specialised workshop.
Brake warning lamp
If the warning lamp comes on, this may be caused by the
following reasons:•
With the handbrake on the warning light comes on
on the instrument
panel. If you are travelling at over 6 km/h with the hand brake on, a text
message or the required operations ma y appear on the instrument panel. In
addition a warning signal is heard.
•
In the event of insufficient brake fluid the warning lamp lights up
on
the instrument panel. At the same time, a text message or the necessary oper-
ations may appear on the instrument panel. Stop the vehicle immediately
and check the level of the brake fluid ⇒page 221.
•
In the event of a fault in the brake system the warning lamp lights up
on the instrument panel and three buzz es are emitted. At the same time, a
text message or the necessary operations may appear on the instrument
panel. Stop the vehicle and do not dr ive on. You should obtain professional
assistance. This warning lamp
can light up together with the anti-locking
brake system warning lamp
⇒ .
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Intelligent technology
180
WARNING
Special care must be taken when working on the engine or on components
in the engine compartment.•
It is important that you read and observe the corresponding warnings
before working in the engine compartment ⇒page 209.
•
If the brake warning symbol does not go out, or if it lights up when
driving, the brake fluid level in the reservoir is too low or there is a fault in
the brake system. Risk of accident. Stop the vehicle and do not drive on.
You should obtain professional assistance.
•
If the brake warning lamp
lights up together with the ABS warning
lamp
, the control function of the ABS could be out of action. This could
cause the rear wheels to lock quickly when you brake. This could cause the
rear to break away. Risk of skidding. Drive carefully to the nearest qualified
workshop and have the fault corrected.
Brake assist system (BAS)The brake servo (BAS) works only when the engine is running.
In an emergency, most drivers brake in time, but not with maximum force.
This results in unnecessarily long braking distances.
The brake assist system intervenes here: if you press the brake pedal very
quickly, the brake assist system registers an emergency situation. It then very
quickly builds up the full brake pressure so that the ABS can be activated
more quickly and efficiently, thus reducing the braking distance.
Do not reduce the pressure on the brake pedal. The brake assist system
switches off automatically as soon as you release the brake.
WARNING
Try to always adapt the speed of the vehicle to weather, road and traffic
conditions. Do not let the extra safety afforded by the system tempt you
into taking any risks when driving. Risk of accident.•
The risk of accident is higher if yo u drive too fast, if you do not keep
your distance from the car in front, and when the road surface is slippery or
wet. The increased accident risk cannot be reduced by the brake assist
system.
•
The brake assist system cannot defy the laws of motion. Slippery and
wet roads are dangerous even with the brake assist system!
•
Modifications to the vehicle or work carried out incorrectly (e. g. to the
engine, the brake system, running gear or any components affecting the
wheels and tyres) could affect the efficiency of the ABS, EDL, ESP and TCS
and lessen their efficiency.
Anti-locking brake system (ABS)
The anti-lock brake system prevents the wheels locking
during braking.The anti-lock brake system (ABS) is an important part of the car's active safety
system.
How the ABS works
If one of the wheels is turning too slowly in relation to the road speed, and is
close to locking, the system will reduce the pressure for this wheel. The driver
is made aware of this control process by a pulsating of the brake pedal and
audible noise. This is a deliberate warning to the driver that one or more of
the wheels is tending to lock and the AB S control function has intervened. In
this situation it is important to keep the brake pedal fully depressed so the
ABS can regulate the brake application. Do not “pump” the brake pedal.
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Intelligent technology181
Safety First
Operating instructions
Tips and Maintenance
Te c h n i c a l D a t a
On braking sharply on slippery ground, this system helps to keep the vehicle
under control, as the wheels do not lock.
However, ABS will not necessarily guar
antee shorter braking distances in all
conditions. The braking distance could ev en be longer if you brake on gravel
or on fresh snow covering a slippery surface.
WARNING
Try to always adapt the speed of the vehicle to weather, road and traffic
conditions. Do not let the extra safety afforded by the system tempt you
into taking any risks when driving. Risk of accident.•
The anti-lock brake system cannot de fy the laws of motion. Slippery
and wet roads are dangerous even with ABS! If you notice that the ABS has
been activated, you should reduce speed immediately to suit the road and
traffic conditions.
•
The ABS cannot reduce the risk of accident if, for example, you are
driving with an unsuitable load or too close to the preceding vehicle.
•
Modifications to the vehicle or work carried out incorrectly (e. g. to the
engine, the brake system, running gear or any components affecting the
wheels and tyres) could affect the effi ciency of the ABS, EDL, ESP and TCS
and lessen their efficiency.
•
The effectiveness of ABS is also determined by the tyres fitted
⇒ page 225.
ABS warning lamp
The warning lamp monitors the ABS.The warning lamp
should light up for a few seconds when the ignition is
switched on. It goes out again after th e system has run through an automatic
test sequence. There is a fault in the ABS if:
•
The ABS warning lamp
does not light up when the ignition is switched
on.
•
The warning lamp does not go out again after a few seconds.
•
The warning lamp lights up when the vehicle is moving.
The vehicle can still be braked in the normal way (except that the ABS control
function is out of action). Please take the vehicle to a qualified workshop as
soon as possible.
If a fault occurs in the ABS, the ESP warning lamp will also light up.
42)
Brake system fault
If the ABS warning lamp
lights up together with the brake warning lamp
, this indicates not only a fault in the ABS function, but also a possible fault
in the brake system ⇒.
At the same time, a text message or the necessary operations may appear on
the instrument panel.
WARNING
Special care must be taken when work ing on the engine or on components
in the engine compartment.•
It is important that you read and observe the corresponding warnings
before working in the engine compartment ⇒page 209.
•
If the brake warning lamp
should light up together with the ABS
warning lamp
, stop the vehicle immediately and check the brake fluid
level in the reservoir ⇒page 221. If the fluid level has dropped below the
“MIN” mark you must not drive on. Ri sk of accident. You should obtain
professional assistance.
•
If the brake fluid level is correct, the fault in the brake system may have
been caused by a failure of the ABS control function. This could cause the
42)Optional equipment
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Intelligent technology
182rear wheels to lock quickly when you brake. This could cause the tail of the
vehicle to skid sideways. Drive careful ly to the nearest qualified workshop
and have the fault corrected.Electronic differential lock (EDL)
The electronic differential lock helps prevent the loss of trac-
tion caused if one of the driven wheels starts spinning.The electronic differential lock (EDL) only works when the engine is running.
EDL helps the vehicle to start moving, accelerate and climb a gradient in slip-
pery conditions where this may otherwise be difficult or even impossible.
It uses the ABS sensors to monitor the speed of the driven wheels.
At speeds of up to approximately 80 km/h, it is able to balance out differ-
ences in the speed of the driven wheel s of approximately 100 rpm caused by
a slippery road surface on one side of the vehicle. It does this by braking the
wheel which has lost traction and distributing more driving force to the other
driven wheel via the differential.
To prevent the disc brake of the braked wheel from overheating, the EDL cuts
out automatically if subjected to excessive loads. The car remains operational
and will behave in the same way as a car without EDL. For this reason, the
driver is not informed that the EDL has been switched off.
The EDL will switch on again automatically when the brake has cooled down.
WARNING
Try to always adapt the speed of the vehicle to weather, road and traffic
conditions. Do not let the extra safety afforded by the system tempt you
into taking any risks when driving. Risk of accident.
•
When accelerating on a slippery surface, for example on ice and snow,
press the accelerator carefully. Despite EDL, the driven wheels may other-
wise start to spin. This could impair the car's stability.
•
Always adapt your driving style to su it road conditions and the traffic
situation.WARNING
Modifications to the vehicle or work carried out incorrectly (e. g. to the
engine, the brake system, running gear or any components affecting the
wheels and tyres) could affect the efficiency of the ABS, EDL, ESP and TCS
and lessen their efficiency.Electronic stabilisation programme (ESP)
The electronic stabilisation programme helps to reduce the
danger of skidding.The electronic stabilisation programme (ESP) consists of ABS, EDL and TCS
and only works when the engine is running.
The ESP should generally be left switched on at all times. Only when the
necessary drive can not be obtained should the ESP be disconnected.
For example:•
when driving with snow chains,
•
when driving in deep snow or on loose surfaces,
•
when rocking the vehicle backwards and forwards to free it from mud, for
example.
WARNING (continued)
WARNING (continued)
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