
Driving
184Back-up programme
A back-up system is in place if a fault should occur in the
control system.The automatic gearbox switches to the back-up programme if a fault should
occur in the control system. This is indicated by a gear pinion symbol which
lights up on the instrument panel display.
It is still possible to move the selector lever to all positions. The manual shift
programme (tiptronic) is not available when the back-up programme is
active.
Vehicles with tiptronic gearbox: when the selector lever is in position D or S
or in the manual shift programme, the gearbox will remain in 3rd gear if 1st,
2nd or 3rd gears were engaged when the fault occurred. The gearbox will
remain in 5th gear if 4th, 5th or 6th gears were engaged. The gearbox will
then engage 3rd gear when you drive away from a standstill or after the
engine is restarted.
It will still be possible to use reverse gear in the normal way. However, the
electronic lock for reverse gear will be switched off.
Caution
Should the gearbox ever switch into the back-up programme, you should take
the vehicle to a technical service or qualified workshop as soon as possible.
Steering wheel with paddle levers
The paddle levers on the steering wheel enable the driver to
manually select pre-programmed ratios or gears.– Briefly pull the left-hand paddle lever to change down to a
lower gear.
– Briefly pull the right-hand paddle lever to change up to a higher gear.The paddle levers are activated when the selector lever is in position D or S,
or the position for the manual shift programme (tiptronic).
The manual shift programme can, of course, still be operated using the
selector lever in the centre console.
Fig. 148 Steering wheel:
tiptronic controls
A–A+
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Intelligent technology185
Safety First
Operating Instructions
Practical Tips
Technical Specifications
Practical TipsIntelligent technologyElectronic Stability Programme (ESP)General notes
The Electronic Stability Programme increases the vehicle’s
stability on the road.The ESP is designed to increase the degree of control in situations where the
vehicle approaches the limits of adhesion, especially when accelerating and
cornering. It reduces the risk of skidding and improves stability in all road
conditions. The system is active across the entire speed range. The anti-lock brake system (ABS), the electronic differential lock (EDL) and
the traction control system (TCS) are all integrated into the Electronic Stability
Programme.
How it works
The ESP control unit processes data from the three integrated systems. It also
processes additional inputs provided by other high-precision sensors. These
register the vehicle’s rotation about the vertical axis (yaw rate), lateral accel-
eration, brake pressure and steering wheel angle.
The system uses the steering wheel angle and road speed to calculate the
changes of direction desired by the driver, and constantly compares them
with the actual behaviour of the vehicle. If the desired course is not being
maintained (for instance, if the vehicle is starting to skid), then the ESP
compensates automatically by braking the appropriate wheel.
The forces acting on the braked wheel bring the vehicle back to a stable
condition. If the vehicle over
swerves (tendency of the rear to leave the road),
the brakes will act on the front wheel facing the outside of the bend. If the
vehicle under swerves (tendency to leave the bend), the braking force is
applied to the rear wheel facing the inside of the bend.
The ESP works in conjunction with the ABS ⇒page 186. If a malfunction
should occur in the ABS, the ESP will also stop working.
Deactivating
The ESP is activated automatically when the engine is started and performs a
self-test routine.
Fig. 149 Centre console
with ESP switch
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Intelligent technology
190and prolongs the service life of the brakes. If you still have to use the brakes,
it is better to brake firmly at intervals than to apply the brakes continuously.
Note
If you wish to equip the vehicle with accessories such as a front spoiler or
wheel covers, it is important that the flow of air to the front wheels is not
obstructed, otherwise the brakes can overheat.Brake servo
The brake servo assists the driver when brakingThe brake servo increases the pressure you apply to the brake pedal. The
brake servo works only when the engine is running.
WARNING
Ensure the vehicle does not move while in neutral, when the engine is
stopped. Failure to do so could result in an accident.
Note
If the brake servo is not working, e.g. because the vehicle has to be towed or
because it is broken, you will have to press the brake pedal considerably
harder to make up for the lack of servo assistance.
Power steeringPower steering makes it easier to turn the steering wheel
when the engine is running.Power steering assists the driver by reducing the force needed to turn the
steering wheel.
Power steering does not work if the engine is off. In this case the steering
wheel requires much more force to turn.
If the steering is held at its turning limit when the vehicle is stationary, this
will place an excessive load on the power steering system. Turning the
steering wheel to its limit places a load on the system, which causes noise. It
will also reduce the idling speed of the engine.
Caution
When the engine is running, do not turn the steering wheel to its limit for
more than 15 seconds. Otherwise, there is a risk of damaging the power
steering.
Note
•If the power steering should fail at any time or the engine is switched off
(for instance when being towed), the vehicle can still be steered. However,
more effort will be required to turn the steering wheel.•If the system is leaking or malfunctioning, please take the vehicle to a
qualified workshop as soon as possible.•The power steering system requires a special hydraulic fluid. The fluid
reservoir is located at the front of the engine compartment on the left
⇒ page 295. The correct fluid level in the reservoir is important for the power
steering to function properly. The hydraulic fluid level is checked at the
Inspection Service.
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Intelligent technology191
Safety First
Operating Instructions
Practical Tips
Technical Specifications
Servotronic*The servotronic system electronically adjusts the power
assisted steering.In vehicles equipped with servotronic power steering the degree of power
assistance ⇒page 190 is adjusted electronically according to road speed.
If a fault should occur in the servotronic system, the power steering will still
operate. The degree of power assistance will, however, no longer adapt to
different speeds. If the electronic regulating system is not working properly,
this is most noticeable when turning the steering wheel at low speeds (for
instance when parking), as more effort will be required than usual. The fault
should be corrected by a qualified workshop as soon as possible.
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Wheels and tyres241
Safety First
Operating Instructions
Practical Tips
Technical Specifications
display TMPS (Tyre Pressure Monitoring System). Please contact the nearest
qualified workshop as soon as possible.
The tyre pressure warning lamp
~ lights up if the tyre pressure on one or
more wheels is significantly lower than the tyre pressure setting which was
confirmed by the driver ⇒.
WARNING
•If the tyre pressure warning lamp lights up
~ you must slow down
immediately and avoid any severe braking or steering manoeuvres. Stop
the vehicle as soon as possible and check the tyres and their pressure.
•The driver is responsible for maintaining correct tyre pressures. There-
fore, the tyre pressure must be regularly checked.•Under certain conditions (e.g. driving at high speeds, on ice and snow
or on poor road surfaces) the tyre pressure warning lamp
~ may not light
up immediately or not at all.
•Please ask your Dealer or qualified workshop whether run-flat tyres can
be used on your vehicle. Fitting this type of tyre in an undue manner could
lead to your driving licence being taken away from you. Furthermore, it may
led to damage to the vehicle or, under certain circumstances, may cause
accidents.•If you change normal tyres for run-flat tyres or vice versa, the control
unit must be reprogrammed by the Dealer or a qualified workshop.Note
If you did not press the button for the tyre pressure monitoring system to
confirm a new tyre pressure setting after making changes to the tyre pres-
sures or changing one or more wheels, the warning lamp
~ may light up
although the tyre pressures are correct. In this case, stop the vehicle as soon
as possible and, after examining the tyres, press the button for the tyre pres-
sure monitoring system.
Tyre ser vice life
The service life of tyres is dependent on tyre pressure, driving
style and fitting.
Fig. 174 Tyre tread wear
indicatorsFig. 175 Diagram for
changing wheels
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Wheels and tyres
242Wear indicators
The original tyres on your vehicle have 1.6 mm high tread wear indicators
⇒ page 241, fig. 174 , running across the tread. Depending on the make,
there will be six to eight of them evenly spaced around the tyre. Markings on
the tyre sidewall (for instance the letters “TWI” or other symbols) indicate the
positions of the tread wear indicators. The minimum tread depth required by
law is 1.6 mm (measured in the tread grooves next to the tread wear indica-
tors). Worn tyres must be replaced. Different figures may apply in export
countries ⇒.
Tyre pressure
Under-inflation or over-inflation will reduce the life of the tyres considerably
and also impair the vehicle’s handling. The inflation pressures are listed on a
sticker on the inside of the fuel tank flap.
Correct inflation pressures are very important, especially at high speeds. The
pressure should therefore be checked at least once a month and before
starting any long journey.
Tyre pressure monitoring (RKA+)*
Monitoring of the tyre pressures is based on the tyre pressures you have
stored. The tyre pressure monitoring system cannot function as intended if
you store tyre pressure settings for a normal load, but then drive with the
vehicle fully laden. The tyre pressure must be adapted to the actual load and
stored accordingly in the tyre pressure monitoring system ⇒ page 240.
Driving style
Fast cornering, heavy acceleration and hard braking all increase tyre wear.
Changing wheels around
If the front tyres are worn considerably more than the rear ones it is advisable
to change them around as shown ⇒page 241, fig. 175. All the tyres will then
last for about the same time. Wheel balance
The wheels on new vehicles are balanced. However, various factors encoun-
tered in normal driving can cause them to become unbalanced, which results
in steering vibration.
Unbalanced wheels should be rebalanced, as they otherwise cause excessive
wear on steering, suspension and tyres. A wheel must also be rebalanced
when a new tyre is fitted.
Incorrect wheel alignment
Incorrect wheel alignment causes excessive tyre wear, impairing the safety of
the vehicle. If tyres show excessive wear, you should have the wheel align-
ment checked by an Authorised Service Centre.
WARNING
There is a serious danger of accidents if a tyre bursts during driving!•The tyres must be replaced at the latest when the tread is worn down to
the tread wear indicators. Failure to do so could result in an accident. Worn
tyres do not grip well at high speeds on wet roads. There is also a greater
risk of aquaplaning.•At continuously high speeds, a tyre with insufficient pressure flexes
more. This causes it to overheat. This can cause tread separation and tyre
blow-out. Risk of accident. Always observe the recommended tyre pres-
sures.•I f t y r e s s h o w e x ce s s i v e w e a r, y o u s h o u l d h a v e t h e r u n n i n g g e a r ch e cke d
by an Authorised Service Centre.•Keep chemicals such as oil, fuel and brake fluid away from tyres.•Damaged wheels and tyres must be replaced immediately!For the sake of the environment
Under-inflated tyres will increase fuel consumption.
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If and when
288Do not pull too hard with the towing vehicle and take care to avoid jerking the
tow-rope. When towing on an unpaved road, there is always a risk of over-
loading and damaging the anchorage points.
The ignition of the vehicle being towed must be switched on to prevent the
steering wheel from locking and also to allow the use of the turn signals,
horn, windscreen wipers and washers.
As the brake servo does not work if the engine is not running, you must apply
considerably more pressure to the brake pedal than you normally would.
As the power assisted steering does not work if the engine is not running, you
will need more strength to steer than you normally would.
Towing vehicles with an automatic gearbox•Put the selector lever into position “N”.•Do not drive faster than 50 km/h when towing a vehicle.•Do not tow further than 50 km.•If a breakdown vehicle is used, the vehicle must be towed with the front
wheels raised.Note
•Observe legal requirements when towing or tow-starting.•Switch on the hazard warning lights of both vehicles. However, observe
any regulations to the contrary.•For technical reasons, vehicles with an automatic gearbox must not be
tow-started.•If damage to your vehicle means that there is no lubricant in the gearbox,
you must raise the drive wheels while the vehicle is being towed.•If the vehicle has to be towed more than 50 km, the front wheels should
be raised during towing, and towing should be carried out by a qualified
person.
•The steering wheel is locked when the vehicle has no electrical power. The
vehicle must then be towed with the front wheels raised. Towing should be
carried out by a qualified person.•The towing eye should always be kept in the vehicle. Please refer to the
notes ⇒page 287, “Tow-starting”.Front towing eyeFitting the towing eye
– Take the towing ring from the on-board tool set.
– Remove the front cover by pressing down on the right hand side.
– Bolt the eye to its limit to the left, in the direction of the arrow
⇒ fig. 231
Fig. 231 Fitting the
towing eye to front rear of
the vehicle
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Index307
Index230 V socket . . . . . . . . . . . . . . . . . . . . . . . . . . . 151AAccessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Adaptive headlights . . . . . . . . . . . . . . . . . . . . . 121 Faulty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Air conditioner 2C-Climatronic . . . . . . . . . . . . . . . . . . . . . . . 156
Air distribution . . . . . . . . . . . . . . . . . . . . . . . 163
Air outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Air purity sensor . . . . . . . . . . . . . . . . . . . . . . 161
Air recirculation . . . . . . . . . . . . . . . . . . . . . . 160
Air recirculation (automatic) . . . . . . . . . . . . 161
Automatic mode . . . . . . . . . . . . . . . . . . . . . 159
Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
ECON Mode (economy) . . . . . . . . . . . . . . . . 160
Economical use . . . . . . . . . . . . . . . . . . . . . . 164
Key settings . . . . . . . . . . . . . . . . . . . . . . . . . 164
Solar-powered blower/sunroof . . . . . . . . . . 165
Temperature selection . . . . . . . . . . . . . . . . . 159
Air duct Fitting . . . . . . . . . . . . . . . . . . . . . . . . . 262, 269
Removing . . . . . . . . . . . . . . . . . . . . . . 261, 268 Air purity sensor . . . . . . . . . . . . . . . . . . . . . . . . . 161
Airbag
Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . . 66
Airbag covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Airbag system . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Curtain airbags . . . . . . . . . . . . . . . . . . . . . . . 41
Front airbags . . . . . . . . . . . . . . . . . . . . . . . . . 32
Side airbags . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . . 29
Alternator Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . . 69
Ambient lighting . . . . . . . . . . . . . . . . . . . . . . . . 124
Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
Anti-lock brake system How it works . . . . . . . . . . . . . . . . . . . . . . . . . 186
Anti-theft alarm system . . . . . . . . . . . . . . . . . . . 106 Interior monitoring . . . . . . . . . . . . . . . . . . . 107
Aquaplaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Armrest Storage compartment in front armrest . . . . 142
Armrests Adjusting the front armrest . . . . . . . . . . . . . 142
Ashtray Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Athermic windscreen . . . . . . . . . . . . . . . . . . . . . 219
Auto-check system . . . . . . . . . . . . . . . . . . . . . . . 75
Automatic car wash tunnel . . . . . . . . . . . . . . . . 210 Automatic gearbox
Dynamic gear control programme . . . . . . . 182
Kick-down feature . . . . . . . . . . . . . . . . . . . . 181
multitronic® . . . . . . . . . . . . . . . . . . . . . . . . 177
Paddle levers (tiptronic mode) . . . . . . . . . . 184
Safety interlock for ignition key . . . . . . . . . 167
Selector lever lock . . . . . . . . . . . . . . . . . . . . 181
Selector lever positions . . . . . . . . . . . . . . . 179
Steering wheel with paddle levers . . . . . . . 184
tiptronic . . . . . . . . . . . . . . . . . . . . . . . 177, 183
Automatic headlight control . . . . . . . . . . . . . . . 115
Auxiliary heater . . . . . . . . . . . . . . . . . . . . . . . . . 165
BBattery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234 Battery voltage . . . . . . . . . . . . . . . . . . . . . . . . 81
Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236
Disconnection . . . . . . . . . . . . . . . . . . . . . . . 234
Long periods of non-use . . . . . . . . . . . . . . . 234
Replacing . . . . . . . . . . . . . . . . . . . . . . 234, 235
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Winter operation . . . . . . . . . . . . . . . . 234, 235
Bicycle rack Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Biodiesel fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
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