
189
Driving
Back-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 en-
gine 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 pos-
sible. Steering wheel with paddle levers
The paddle levers on the steering wheel enable the driver to
manually select pre-programmed ratios or gears.
Fig. 159 Steering wheel:
tiptronic controls
– 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 gear
lever in the centre console.
Safety FirstOperating InstructionsPractical TipsTechnical Specifications

190Intelligent technology
Practical Tips
Intelligent technology
Electronic Stability Programme (ESP) General notes
The Electronic Stability Programme increases the vehicle's
stability on the road.
Fig. 160 Centre console
with ESP switch
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 Stabil-
ity Programme.
How it works
The ESP control unit processes data from the three integrated systems. It al-
so processes additional inputs provided by other high-precision sensors.
These register the vehicle's rotation about the vertical axis (yaw rate), later-
al acceleration, 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 191. 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.

194Intelligent technology
If the brakes are not used frequently, or if rust has formed on the disks, it is
advisable to clean off the pads and disks by braking firmly a few times at a
moderately high speed ⇒
.
Faults in the brake system
If the brake pedal travel should ever increase suddenly, this may mean that
one of the two brake circuits has failed. Drive immediately to the nearest
specialised workshop and have the fault repaired. Drive there slowly and re-
member that you will have to apply more pressure on the brake pedal and
allow for longer stopping distances.
Low brake fluid level
Malfunctions can occur in the brake system if the brake fluid level is too
low. The brake fluid level is monitored electronically.
WARNING
When applying the brakes to clean off deposits on the pads and discs,
select a clear, dry road. Be sure not to inconvenience or endanger other
road users. Risk of accident.
CAUTION
● Never let the brakes “drag” by leaving your foot on the pedal when it is
not necessary to brake. This overheats the brakes, resulting in longer stop-
ping distances and greater wear.
● Before driving down a long, steep gradient, it is advisable to reduce
speed and change to a lower gear (or move the gear lever to a lower gear
position if your vehicle has automatic transmission). This makes use of en-
gine braking and 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 braking
The 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 steering
Power 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.

195
Intelligent technology
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
specialised 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 296. The correct fluid level in the reservoir is important for the pow-
er steering to function properly. The hydraulic fluid level is checked at the
Inspection Service.
Servotronic*
The servotronic system electronically adjusts the power as-
sisted steering.
In vehicles equipped with servotronic power steering the degree of power
assistance ⇒ page 194 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 specialised workshop as soon as possible.
Safety FirstOperating InstructionsPractical TipsTechnical Specifications

244Wheels and tyres
Tyre pressure warning lamp on
When you switch on the ignition, the tyre pressure warning lamp will
light up for about 2 seconds. There is a fault in the system if the indicator
stays on permanently after switching on the ignition. The instrument panel
also 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.
Therefore, 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. Further-
more, it may led to damage to the vehicle or, under certain circumstan-
ces, 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 pressure monitoring system.

246Wheels and tyres
Wheel balance
The wheels on new vehicles are balanced. However, various factors encoun-
tered in normal driving can cause them to become unbalanced, which re-
sults in steering vibration.
Unbalanced wheels should be rebalanced, as they otherwise cause exces-
sive wear on steering, suspension and tyres. A wheel must also be reba-
lanced 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
alignment 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 wear indica-
tors are worn ⇒ page 245. 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.
● If tyres show excessive wear, you should have the running gear
checked 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. Run-flat tyres*
Run-flat tyres allow you to continue driving even with a
punctured tyre, in the majority of cases.
In vehicles that are factory-fitted with run-flat tyres 1)
the loss of tyre
pressure is indicated on the instrument panel.
Driving with run-flat tyres (emergency running)
– Leave the ESP/TCS (Electronic Stability Programme) switched
on, or switch on ⇒ page 68.
– Continue driving carefully and slowly (80 km/h maximum).
– Avoid sudden manoeuvres and sharp turns.
– Avoid driving over obstacles (for example kerbs) or potholes.
– Look out for the ESP/TCS intervening often, smoke coming from
the tyres or the smell of rubber, the vehicle vibrating or a clat-
tering noise. If any of these occur, stop the vehicle.
The run-flat tyres have a tag on the side of the tyre, with the description:
“DSST”, “Eufonia”, “RFT”, “ROF”, “RSC”, “SSR” or “ZP”.
The sides of this type of tyre are reinforced. When the tyres lose air they are
supported on the sides (emergency driving).
The loss of pressure in the tyre is shown on the instrument panel. You can
then drive a maximum of 80 km and if the circumstances are favourable (for
example, low load), even more.
The damaged tyre should be changed as soon as possible. The rim should
be checked in a specialist workshop to detect possible damage and replace
1)
Depending upon version and country.

290If and when
Do 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
overloading 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 ap-
ply 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.
● 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 gear-
box, 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 289, Tow-starting.
Front towing eyeFig. 242 Fitting the tow-
ing eye to front rear of
the vehicle
Fitting 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. 242

Index
Numbers and Symbols
230 V socket . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
A
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Adaptive headlights . . . . . . . . . . . . . . . . . . . . . 121 Faulty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Airbag Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . 66
Airbag covers . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Airbag system . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Curtain airbags . . . . . . . . . . . . . . . . . . . . . . . 42
Front airbags . . . . . . . . . . . . . . . . . . . . . . . . 33
Side airbags . . . . . . . . . . . . . . . . . . . . . . . . . 39
Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . 31
Air conditioner 2C-Climatronic . . . . . . . . . . . . . . . . . . . . . . 161
Air distribution . . . . . . . . . . . . . . . . . . . . . . 168
Air outlets . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Air purity sensor . . . . . . . . . . . . . . . . . . . . . 166
Air recirculation . . . . . . . . . . . . . . . . . . . . . 165
Air recirculation (automatic) . . . . . . . . . . . 166
Automatic mode . . . . . . . . . . . . . . . . . . . . . 164
Blower . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
Defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . 165
ECON Mode (economy) . . . . . . . . . . . . . . . 165 Economical use . . . . . . . . . . . . . . . . . . . . . 169
Key settings . . . . . . . . . . . . . . . . . . . . . . . . 169
Solar-powered blower/sunroof . . . . . . . . . 169
Temperature selection . . . . . . . . . . . . . . . . 164
Air duct Fitting . . . . . . . . . . . . . . . . . . . . . . . . . 266, 273
Removing . . . . . . . . . . . . . . . . . . . . . . 266, 272
Air purity sensor . . . . . . . . . . . . . . . . . . . . . . . . 166
Alternator Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . 69
Ambient lighting . . . . . . . . . . . . . . . . . . . . . . . 124
Anti-lock brake system How it works . . . . . . . . . . . . . . . . . . . . . . . . 191
Anti-theft alarm system . . . . . . . . . . . . . . . . . . 107 Interior monitoring . . . . . . . . . . . . . . . . . . . 108
Antifreeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230
Aquaplaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 246
Armrest Storage compartment in front armrest . . . 142
Armrests Adjusting the front armrest . . . . . . . . . . . . 141
Ashtray Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
Athermic windscreen . . . . . . . . . . . . . . . . . . . . 221
Auto-check system . . . . . . . . . . . . . . . . . . . . . . . 75
Automatic car wash tunnel . . . . . . . . . . . . . . . 212 Automatic gearbox
Dynamic gear control programme . . . . . . . 187
Kick-down feature . . . . . . . . . . . . . . . . . . . . 186
multitronic® . . . . . . . . . . . . . . . . . . . . . . . . 182
Paddle levers (tiptronic mode) . . . . . . . . . 189
Safety interlock for ignition key . . . . . . . . . 172
Selector lever lock . . . . . . . . . . . . . . . . . . . 186
Selector lever positions . . . . . . . . . . . . . . . 184
Steering wheel with paddle levers . . . . . . 189
tiptronic . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
tiptronic mode . . . . . . . . . . . . . . . . . . . . . . 188
Automatic headlight control . . . . . . . . . . . . . . 115
Auxiliary heater . . . . . . . . . . . . . . . . . . . . . . . . 170
B
Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237 Battery voltage . . . . . . . . . . . . . . . . . . . . . . . 81
Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Disconnection . . . . . . . . . . . . . . . . . . . . . . . 237
Long periods of non-use . . . . . . . . . . . . . . 237
Replacing . . . . . . . . . . . . . . . . . . . . . . 237, 238
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Winter operation . . . . . . . . . . . . . . . . 237, 238
Bicycle rack Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
Biodiesel fuel . . . . . . . . . . . . . . . . . . . . . . . . . . 224
307
Index