176Intelligent technology
The ASR helps the car to start moving, accelerate and climb a gradient in
slippery conditions, where this may otherwise be difficult or even impossi-
ble.
The ASR automatically switches on when the engine is started. If necessary,
it may be turned on or off by briefly pushing the ESC button on the centre
console.
When the ASR is off, the warning lamp is lit. The ASR should normally be
left on. Only in exceptional circumstances, when the slipping of the wheels
is required, can they be disconnected using the ESC button, for example.
● With compact temporary spare wheel.
● When using the snow chains.
● When driving in deep snow or on loose surfaces
● When the vehicle is bogged-down, to free it by rocking.
The ASR should be switched on again as soon as possible.
WARNING
● Remember that not even the ASR can defy the laws of physics. This
should be kept in mind, particularly on slippery and wet roads and when
towing a trailer.
● Always adapt your driving style to suit the condition of the roads and
the traffic situation. The greater safety provided by the ASR should not
encourage you to run any risks.
CAUTION
● To ensure that the ASR works correctly, identical tyres should be fitted
on all four wheels. Any differences in the rolling radius of the tyres can
cause the system to reduce engine power when this is not desired.
● Any modifications made to the vehicle (for example, to the engine,
brake system, running gear or to the combination of wheels and tyres) may
affect the operation of the ABS and ASR. XDS*
Driveshaft differential
When taking a bend, the driveshaft differential mechanism allows the outer
wheel to turn at a higher speed than the inner wheel. In this way, the wheel
that is turning faster (outer wheel) receives less drive torque than the inner
wheel. This may mean that in certain situations the torque delivered to the
inner wheel is too high, causing the wheels to spin. On the other hand, the
outer wheel is receiving a lower drive torque than it could transmit. This
causes an overall loss of lateral grip on the front axle, resulting in under-
steer or “lengthening” of the trajectory.
The XDS system can detect and correct this effect via the sensors and sig-
nals of the ESC.
Via the ESC, the XDS will brake the inside wheel and counter the excess
driving torque of that wheel. This means that the driver's desired trajectory
is much more precise,
The XDS system works in combination with the ESC and is always active,
even when the ASR traction control is disconnected.
Electronic Stability Control (ESC)*
General notes
The Electronic Stability Control increases the vehicle's stabil-
ity on the road. The Electronic Stability Control helps reduce the danger of skidding.
The Electronic Stability Control (ESC) includes the systems ABS, EDL and
ASR
177
Intelligent technology
Electronic Stability Control (ESC)*
The ESC reduces the risk of skidding by braking the wheels individually.
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. When irregularities occur, for exam-
ple, if the vehicle begins to skid, the ESC brakes the appropriate wheel au-
tomatically.
The forces acting on the braked wheel bring the vehicle back to a stable
condition. If the vehicle tends to oversteer, the system will act on the front
wheel on the outside of the turn.
WARNING
● Remember that not even the ESC can defy the laws of physics. This
should be kept in mind, particularly on slippery and wet roads and when
towing a trailer.
● Always adapt your driving style to suit the condition of the roads and
the traffic situation. The greater safety provided by the ESC should not
encourage you to run any risks.
CAUTION
● To ensure that the ESC works correctly, all four wheels must be fitted
with the same tyres. Any differences in the rolling radius of the tyres can
cause the system to reduce engine power when this is not desired.
● Any modifications made to the vehicle (for example, to the engine,
brake system, running gear or to the combination of wheels and tyres) may
affect the operation of the ABS, EDL, ESC and ASR. Anti-lock brake system (ABS)
The anti-lock brake system prevents the wheels locking during braking
⇒ page 175
Electronic differential lock (EDL)*
The electronic differential lock helps prevent the loss of trac-
tion caused if one of the driven wheels starts spinning.
EDL helps the vehicle to start moving, accelerate and climb a gradient in
slippery conditions where this may otherwise be difficult or even impossi-
ble.
The system will control the revolutions of the driven wheels using the ABS
sensors (in case of an EDL fault the warning lamp for ABS lights up)
⇒ page 71.
At speeds of up to approximately 80 km/h (50 mph), it is able to balance
out differences in the speed of the driven wheels 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 braking wheel from overheating, the EDL
cuts out automatically if subjected to excessive loads. The vehicle will con-
tinue to function normally without EDL. For this reason, the driver is not in-
formed that the EDL has been switched off.
The EDL will switch on again automatically when the brake has cooled
down.
Safety FirstOperating instructionsPractical TipsTechnical Specifications
Overviewcontrol lamps . . . . . . . . . . . . . . . . . . . . . . . . 67
Control lamps . . . . . . . . . . . . . . . . . . . . . . . . 65
Dash panel . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Instruments . . . . . . . . . . . . . . . . . . . . . . . . . 57
warning lamps . . . . . . . . . . . . . . . . . . . . . . . 67
Warning lamps . . . . . . . . . . . . . . . . . . . . . . . 65
P Paintwork Polishing . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Panoramic sunroof . . . . . . . . . . . . . . . . . . . . . . . 99
Parking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165
Parking aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Parking lights . . . . . . . . . . . . . . . . . . . . . . . . . . 108
Passenger see Correct sitting position . . . . . . . 10, 11, 12
Pedals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Petrol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205 Driving abroad . . . . . . . . . . . . . . . . . . . . . . 184
Petrol additives . . . . . . . . . . . . . . . . . . . . . . . . 205
Physical principles of a frontal collision . . . . . . 21
Plastic parts . . . . . . . . . . . . . . . . . . . . . . . . . . . 190
Plastic parts cleaning . . . . . . . . . . . . . . . . . . . . 193
Pollen filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Pollution filter . . . . . . . . . . . . . . . . . . . . . . . . . . 145
Power socket in the luggage compartment . . . . . . . . . . . 130
Power sockets . . . . . . . . . . . . . . . . . . . . . . . . . . 129
Products for vehicle maintenance . . . . . . . . . . 187 R
Radio frequency remote control . . . . . . . . . . . . 88 Changing the battery . . . . . . . . . . . . . . . . . . 89
Rain sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Rear drink holder . . . . . . . . . . . . . . . . . . . . . . . 128
Rear fog light control lamp . . . . . . . . . . . . . . . . . . . . . . . . . 71
Control lamp . . . . . . . . . . . . . . . . . . . . . . . . 101
Rear head restraints . . . . . . . . . . . . . . . . . . . . . . 14
Rear lid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 Control lamp . . . . . . . . . . . . . . . . . . . . . . . . . 74
Emergency opening . . . . . . . . . . . . . . . . . . . 94
Rear parking aid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167
Rear seat folding down . . . . . . . . . . . . . . . . . . . . . . . . 123
Rear seats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
Rear shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Rear shelf with storage compartment Storage compartment . . . . . . . . . . . . . . . . 135
Rear view mirrors . . . . . . . . . . . . . . . . . . . . . . . 114
Rear window automatic wiper/washer . . . . . . 113
Rear window wiper . . . . . . . . . . . . . . . . . . . . . . 113
Recommended gear display . . . . . . . . . . . . . . . 60
Refuelling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Remote control key Buttons . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
Synchronising . . . . . . . . . . . . . . . . . . . . . . . . 89
Removing and fitting the wheel . . . . . . . . . . . 234
Repairs Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Replacement keys . . . . . . . . . . . . . . . . . . . . . . . 87
Replacement of parts . . . . . . . . . . . . . . . . . . . . 196
Rev counter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Reverse gear
Manual gearbox . . . . . . . . . . . . . . . . . . . . . 156
Roll-back function panoramic/tilting sunroof . . . . . . . . . . . . . 100
Windows . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Roof aerial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Roof rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136
Rubber seals . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
Running in Brake pads . . . . . . . . . . . . . . . . . . . . . . . . . 179
Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Tyres . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Running in tyres . . . . . . . . . . . . . . . . . . . . . . . . 179
S Safe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Safe driving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Safety equipment . . . . . . . . . . . . . . . . . . . . . . . . . 7
Safety instructions Coolant temperature . . . . . . . . . . . . . . . . . . 76
Safety notes Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Deactivating front passenger airbag . . . . . . 42
Front airbags . . . . . . . . . . . . . . . . . . . . . . . . 37
Seat belt tensioners . . . . . . . . . . . . . . . . . . . 28
Side airbags . . . . . . . . . . . . . . . . . . . . . . . . . 39
288 Index