Trailer towing201
Safety First
Controls and equipment
Practical tips
Technical Data
Where possible, operate the trailer with the maximum permitted
draw bar
weight on the ball joint of the towing bracket, but do not exceed the specified
limit.
Tyre pressure
Check the tyre pressures on your car, and adjust for “full load” conditions
(refer to the sticker listing the tyre pressures on the door pillar). It may also be
necessary to adjust the tyre pressures on the trailer according to the recom-
mendations of the trailer manufacturer.
Exterior mirrors
Check whether you can see enough of the road behind the trailer with the
standard mirrors. If this is not the case you should have additional mirrors
fitted. The two exterior mirrors should be fitted on folding arms. Adjust the
mirrors to give sufficient rear vision.
Headlights
Before starting a journey, check the headlight beam settings with the trailer
hitched up. If necessary, alter the height of the headlight beams by means of
the headlight range control. See ⇒page 120.
Power supply
When you remove the ignition key, the power supply to the trailer is inter-
rupted.
Removable ball joint coupling
Vehicles with a factory-fitted towing bracket are equipped with a removable
ball joint coupling. This is stored in the spare wheel well in the luggage
compartment together with the necessary fitting instructions.
Note
If you frequently tow, we recommend you also have vehicle ser viced between
services.
Notes on towing
Towing a trailer involves additional attention by the driver.Weight distribution
The weight distribution of a loaded trailer with an unladen vehicle is very
unfavourable. However, if this cannot be avoided, drive extra slowly to allow
for the unbalanced weight distribution.
Speed
The stability of the car and trailer is reduced with increasing speed. Therefore,
it is advisable not to drive at the maximum permissible speed in an unfavour-
able road, weather or wind conditions. This especially applies when driving
downhill.
You should always reduce speed immediately if the trailer shows the slightest
sign of swaying . Never try to stop the “snaking” by increasing speed.
Anticipate hazards and brake in good time. If towing a trailer with an inertia
brake , first brake gently and then more severely. This will prevent brake
tapping by the trailer wheels when they lock. Select a low gear in due course
before going down a steep downhill. This enables you to use the engine
braking to slow down the vehicle.
Swaying and pitching can be reduced by stabiliser aids. We recommend
having stabiliser aids installed when towing trailers with a high trailer load.
They can be purchased and installed at a Dealer.
Reheating
When climbing long hills in hot weather with the engine running fast in low
gear, you should keep an eye on the coolant temperature gauge ⇒page 60.
Reduce speed immediately if the needle moves to the right end of the scale.
If the temperature warning light
in the instrument cluster should start
flashing, stop the car and let the engine cool down by running it at idling
speed for a few minutes.
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Checking and refilling levels233
Safety First
Controls and equipment
Practical tips
Technical Data
Liquid coolant losses
Any loss of liquid coolant normally indicates a
leak in the cooling system. In
this case the cooling system should be inspected by a specialist garage
without delay. It is not sufficient merely to top up the liquid coolant.
If there are no leaks in the system, a loss of liquid coolant can only occur if
the coolant boils and is forced out of the system as a result of overheating.
Caution
Radiator sealants must not be added to the liquid coolant. Such additives
could seriously impair the function of the cooling system.Topping up the liquid coolant
Be careful when topping up with liquid coolant.– Switch the engine off.
– Wait for the engine to cool down.
– Cover the cap on the expansion tank ⇒page 232, fig. 181 with a
cloth, and carefully unscrew the cap anti-clockwise ⇒.
– Add liquid coolant.
– Screw on the cap tightly.Make sure that the liquid coolant meets the required specifications
⇒page 231, “Liquid coolant”. Do not use a different type of anti-freeze if
anti-freeze G12++ is not available. In this case, use only water and bring the
anti-freeze concentration back up to the correct level as soon as possible.
Always top up with new liquid coolant. Do not fill above the “max” mark. Excess liquid coolant is forced out of the
system through the valve in the filler cap when the engine gets hot.
If a lot of liquid coolant has been lost, wait for the engine to
cool down before
putting in cold coolant. Failure to do so could result in serious engine
damage.
WARNING
•The cooling system is under pressure. Do not unscrew the cap on the
expansion tank when the engine is hot. Failure to comply could result in
burns.•The anti-freeze and liquid coolant can be a health hazard. Therefore,
the anti-freeze should be stored in the original container in a safe place out
of reach of children. Failure to comply could result in poisoning.For the sake of the environment
Drained off coolant should not be used again. Drain off the used coolant into
a suitable container and dispose of it in the proper manner (observe environ-
mental regulations).Radiator fan
The radiator fan can start running spontaneously.The auxiliary fan can continue to run for as long as 10 minutes after stopping
the engine – even after the ignition is switched off. It may also start running
suddenly ⇒ after some while if•stored heat raises the coolant temperature, or•the hot engine compartment is additionally heated up by the sun.
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Wheels and tyres247
Safety First
Controls and equipment
Practical tips
Technical Data
Anti-puncture tyres*
Anti-puncture tyres allow you to continue driving even with a
punctured tyre, in the majority of cases.Vehicles equipped with anti-puncture
4) tyres from the factory indi-
cate the loss of tyre pressure on the instrument panel.
Driving with anti-puncture tyres (emergency gear)
– Leave the ESP/TCS (electronic stabilisation 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 anti-puncture 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 it if necessary. We recommend you contact Technical Service. If more than one
tyre is being used under emergency conditions, this reduces the distance
which can be travelled.
Starting driving in emergency conditions
When loss in tyre pressure is displayed on the instrument panel, this means
that at least one tyre is being driven in emergency conditions
⇒.
End of emergency operation
Do not drive on if:
•smoke is coming from one of the tyres,•there is a smell of rubber,•the vehicle vibrates,•there is a rattling noise.
When is it no longer possible to continue driving even using anti-puncture
tyres?•If the Electronic Stabilisation Program (ESP) is out of operation.•If the tyre pressure monitoring system is out of operation.•If one of the tyres has been severely damaged in an accident, etc. If a tyre
has been badly damaged there is a risk that parts of the tread can be thrown
off and cause damage to the fuel lines, brake pipes or fuel filler.•It is also advisable to stop driving if severe vibrations occur, or if the wheel
starts overheating and gives off smoke.WARNING
When driving in emergency conditions, the driving quality of the vehicle is
considerably impaired.•The maximum permitted speed of 80 km/h is subject to road and
weather conditions. Please observe legal requirements when doing so.•Avoid sharp turns and rapid manoeuvres, and brake earlier than usual.
4)Depending upon version and country.
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Index307
DDanger of fitting a child seat on the front passenger
seat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Dash panel cleaning . . . . . . . . . . . . . . . . . . . . . 217
Data entry control . . . . . . . . . . . . . . . . . . . . . . . . 88
Date display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Daytime running lights . . . . . . . . . . . . . . . . . . . 121
Diesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
Diesel engine Winter driving . . . . . . . . . . . . . . . . . . . . . . . . 225
Diesel engine particulate filter . . . . . . . . . . . . . 197
Diesel particulate filter . . . . . . . . . . . . . . . . . . . . 80 Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
Digital clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
Dipped headlights . . . . . . . . . . . . . . . . . . . . . . . 116
DIS Average fuel consumption . . . . . . . . . . . . . . 85
Average speed . . . . . . . . . . . . . . . . . . . . . . . . 85
Driving time . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Instantaneous fuel consumption . . . . . . . . . 85
Disabling front passenger airbag Safety notes . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Disabling the airbag Disabling front passenger airbag . . . . . . . . . 44
Disposal Airbags . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Distance covered . . . . . . . . . . . . . . . . . . . . . . . . . 86
Distance display . . . . . . . . . . . . . . . . . . . . . . . . . 63
Door catch/ tailgate warning . . . . . . . . . . . . . . . 74 Door lock cylinders . . . . . . . . . . . . . . . . . . . . . . 215
Doors
Childproof lock . . . . . . . . . . . . . . . . . . . . . . 104
Locking the doors manually if the central lock-ing fails to work . . . . . . . . . . . . . . . . . . . . 102
Driver information system . . . . . . . . . . . . . . . . . . 71 Ambient temperature display . . . . . . . . . . . . 72
Auto-check system . . . . . . . . . . . . . . . . . . . . 75
CD and radio display . . . . . . . . . . . . . . . . . . . 72
Door catch/ tailgate warning . . . . . . . . . . . . 74
Driver messages . . . . . . . . . . . . . . . . . . . . . . 76
Handbrake warning . . . . . . . . . . . . . . . . . . . . 76
Menu display . . . . . . . . . . . . . . . . . . . . . . . . . 87
On-board computer . . . . . . . . . . . . . . . . . . . . 85
Red symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Speed warning . . . . . . . . . . . . . . . . . . . . . . . . 82
Warning messages . . . . . . . . . . . . . . . . . . . . 76
Yellow symbols . . . . . . . . . . . . . . . . . . . . . . . 79
Driver messages . . . . . . . . . . . . . . . . . . . . . . . . . 76
Driver's seat Assigning the key to the seat . . . . . . . . . . . 140
Enabling stored settings . . . . . . . . . . . . . . . 139
With memory . . . . . . . . . . . . . . . . . . . . . . . . 138
Driving Driving abroad . . . . . . . . . . . . . . . . . . . . . . . 199
Economically / With Respect for the Environment . . . . . . . . . . . . . . . . . . . . . . . 197
Driving abroad . . . . . . . . . . . . . . . . . . . . . . . . . . 199 Headlights . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Driving safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Dynamic gear control program . . . . . . . . . . . . . 186
EEconomical driving . . . . . . . . . . . . . . . . . . . . . . 197
Electric windows . . . . . . . . . . . . . . . . . . . . . . . . 109 Central locking system . . . . . . . . . . . . . . . . 111
Possible malfunctions . . . . . . . . . . . . . . . . . 111
Switch on font passenger's door . . . . . . . . 110
Switch on rear doors . . . . . . . . . . . . . . . . . . 110
Switches in the driver's door . . . . . . . . . . . 110
Electrical power point . . . . . . . . . . . . . . . . . . . . 155
Electronic differential lock How it works . . . . . . . . . . . . . . . . . . . . . . . . 191
Electronic immobiliser . . . . . . . . . . . . . . . . . . . . 98
Electronic stabilisation programme Description . . . . . . . . . . . . . . . . . . . . . . . . . . 170
How the system works . . . . . . . . . . . . . . . . 189
Warning light . . . . . . . . . . . . . . . . . . . . . . . . 171
Emergencies Changing a wheel . . . . . . . . . . . . . . . . . . . . 254
Disconnecting the battery . . . . . . . . . . . . . . 238
Jack . . . . . . . . . . . . . . . . . . . . . . . . . . . 251, 256
Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
tyre mobility system . . . . . . . . . . . . . . . . . . 252
Engine Running in . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Stop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173
Engine compartment Safety instructions . . . . . . . . . . . . . . . . . . . 227
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Index
312Spare wheel
Steel rim . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253
Speed warning . . . . . . . . . . . . . . . . . . . . . . . 81, 82
Speed warning function . . . . . . . . . . . . . . . . . . . 82
Speedometer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Steam jets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
Steering Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
Manual steering wheel adjustment . . . . . . 170
Steering wheel controls . . . . . . . . . . . . . . . . . . . 91
Stopping the engine . . . . . . . . . . . . . . . . . . . . . 173
Sun roof Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Sun roof / deflector . . . . . . . . . . . . . . . . . . . . . . 112
Sun visors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127
Sunroof . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 Automatic close function . . . . . . . . . . . . . . 113
Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
Manual operation . . . . . . . . . . . . . . . . . . . . 114
Override function . . . . . . . . . . . . . . . . . . . . 114
Supplementary heating . . . . . . . . . . . . . . . . . . 169
Switches in the driver's door Electric windows . . . . . . . . . . . . . . . . . . . . . 110
Symbols Red symbols in central display . . . . . . . . . . 77
Yellow symbols in central display . . . . . . . . 79
TTailgateCentral locking system . . . . . . . . . . . . . . . . 103
Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126
TCS How the system works . . . . . . . . . . . . . . . . 192
Technical modifications . . . . . . . . . . . . . . . . . . 220
The danger of not using the seat belt . . . . . . . . 20
The environment Heated rear window . . . . . . . . . . . . . . . . . . 127
Leaks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227
Roof carriers . . . . . . . . . . . . . . . . . . . . . . . . 152
Warming up the engine . . . . . . . . . . . . . . . 172
Tightening torque of wheel bolts . . . . . . . . . . . 294
tiptronic . . . . . . . . . . . . . . . . . . . . . . . . . . . 181, 187
Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
Tow starting Comments . . . . . . . . . . . . . . . . . . . . . . . . . . 288
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200, 288 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . 202
Notes on towing . . . . . . . . . . . . . . . . . 200, 201
Removable towing bracket . . . . . . . . . . . . . 203
Technical requirements . . . . . . . . . . . . . . . 200
Towing a trailer . . . . . . . . . . . . . . . . . . . . . . . . . 294
Towing bracket, fitting . . . . . . . . . . . . . . . . . . . 209
Towing eye . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288
Towing eyes . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Tow-starting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 288
Traction control system How the system works . . . . . . . . . . . . . . . . 192 Trailer weights . . . . . . . . . . . . . . . . . . . . . . . . . . 294
Trip recorder . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Type plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Tyre Mobility System . . . . . . . . . . . . . . . . . . . . . 259
Tyre mobility system . . . . . . . . . . . . . . . . . . . . . 252
Tyre pressure . . . . . . . . . . . . . . . . . . . . . 66, 90, 242
Loss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244
Tyre pressure monitoring . . . . . . . . . . . . . . . . . 243
Tyre pressure monitoring system . . . . . . . . . . . . 89
Tyre pressures . . . . . . . . . . . . . . . . . . . . . . . . . . 294
Tyre repair kit Tyre Mobility System . . . . . . . . . . . . . . . . . . 259
Tyres and wheels Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 248
Tyres service life . . . . . . . . . . . . . . . . . . . . . . . . 245
Tyres tread depth . . . . . . . . . . . . . . . . . . . . . . . 246
Tyres with directional tread pattern . . . . . . . . . 242
UUnderbody maintenance . . . . . . . . . . . . . . . . . 216VVehicle data . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Vehicle identification data . . . . . . . . . . . . . . . . 292
Vehicle identification number . . . . . . . . . . . . . 292
Vehicle Maintenance Exterior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
Vehicle modifications . . . . . . . . . . . . . . . . . . . . 220
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