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212Driving and operating
A buzzing tone sounds as a warning
when the release handle is pulled out and the ball neck is disengaged.
With the flat of the hand, swivel the
released coupling ball bar to the right
until it engages under the floor. Make sure that the release handle is back inits hidden initial position, otherwise
the buzzing tone will not stop.9 Warning
Towing a trailer is permitted only
when the coupling ball bar is fitted correctly. If the coupling ball bar
does not engage correctly or if the
release handle is impossible to guide to its hidden initial position in the housing or if the buzzing tone
sounds after engaging the
coupling ball bar, seek the
assistance of a workshop.
Eye for break-away stopping cable
Attach break-away stopping cable to
eye.
Trailer stability assist
If the system detects snaking
movements, engine power is reduced and the vehicle/trailer combination is
selectively braked until the snaking
ceases. While system is working keep
steering wheel as still as possible.
Trailer stability assistant (TSA) is a
function of the Electronic Stability
Control 3 167.
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Vehicle care213Vehicle careGeneral Information...................213
Vehicle checks ........................... 214
Bulb replacement .......................222
Electrical system ........................232
Vehicle tools .............................. 239
Wheels and tyres .......................240
Jump starting ............................. 252
Towing ....................................... 254
Appearance care .......................257General Information
Accessories and vehicle
modifications
We recommend to use genuine parts and accessories and factory
approved parts specific for your
vehicle type. We cannot assess or
guarantee reliability of other products
- even if they have a regulatory or
otherwise granted approval.
Do not make any modifications to the
electrical system, e.g. changes of
electronic control units (chip tuning).Caution
When transporting the vehicle on
a train or on a recovery vehicle, the
mud flaps might be damaged.
Vehicle storage
Storage for a long period of time
If the vehicle is to be stored for several months:
■ Wash and wax the vehicle.
■ Have the wax in the engine compartment and underbody
checked.
■ Clean and preserve rubber seals.
■ Fill up fuel tank completely.
■ Change engine oil.
■ Drain washer fluid reservoir.
■ Check coolant antifreeze and corrosion protection.
■ Adjust tyre pressure to the value specified for full load.
■ Park vehicle in dry, well ventilated place. Engage first or reverse gear
or set selector lever to P. Prevent
the vehicle from rolling.
■ Do not apply parking brake.
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218Vehicle care
General9Warning
Allow the engine to cool before
opening the cap. Carefully open
the cap, relieving the pressure
slowly.
To top up use a 1:1 mixture of
released coolant concentrate mixed
with clean tap water. If no coolant
concentrate is available, use clean
tap water. Install the cap tightly. Have the coolant concentration checked
and have the cause of the coolant
loss remedied by a workshop.
Washer fluid
Fill with clean water mixed with a
suitable quantity of windscreen
washer fluid which contains
antifreeze. For the correct mixing ratio refer to the washer fluid container.
Caution
Only washer fluid with a sufficient
antifreeze concentration provides
protection at low temperatures or
a sudden drop in temperature.
Brakes
In the event of minimum thickness ofthe brake lining, a squealing noise
sounds during braking.
Continued driving is possible but
have the brake lining replaced as
soon as possible.
Once new brake linings are installed,
do not brake unnecessarily hard for
the first few journeys.
Brake fluid9 Warning
Brake fluid is poisonous and
corrosive. Avoid contact with eyes, skin, fabrics and painted surfaces.
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Vehicle care219
The brake fluid level must be betweenthe MIN and the MAX marks.
When topping up, ensure maximum cleanliness as contamination of the
brake fluid can lead to brake system
malfunctions. Have the cause of the
loss of brake fluid remedied by a
workshop.
Only use high-performance brake
fluid approved for the vehicle. Brake
and clutch fluid 3 262.
Vehicle battery
Vehicles without stop-start system
will be equipped with a lead acid
battery. Vehicles with stop-start
system will be equipped with an AGM battery which is not a lead acid
battery.
The vehicle battery is maintenance-
free provided that the driving profile
allows sufficient charging of the
battery. Short-distance-driving and
frequent engine starts can discharge
the battery. Avoid the use of
unnecessary electrical consumers.
Batteries do not belong in household
waste. They must be disposed of at
an appropriate recycling collection
point.
Laying up the vehicle for more than
4 weeks can lead to vehicle battery
discharge. Disconnect the clamp from the negative terminal of the vehicle
battery.
Ensure the ignition is switched off
before connecting or disconnecting
the vehicle battery.
Battery discharge protection 3 132.
Replacing the vehicle battery Note
Any deviation from the instructions
given in this paragraph may lead to
a temporary deactivation of the stop-
start system.
Page 230 of 321
228Vehicle care
2. Unscrew three plastic securingnuts from the inside by hand.
3. Carefully withdraw the lightassembly from the recesses and
remove.
4. Turn bulb holder anticlockwise and remove. Replace bulb by
withdrawing or turning:
Turn signal light 1
Rear fog light 2, only on driver side
Reverse light 3
Tail light and brake light are
designed as LEDs. In case of
failure, have LEDs replaced by a
workshop.
5. Insert bulb holder into the tail light
assembly and turn clockwise. Fit
light assembly with the retaining
pins into the recesses of the
vehicle body and tighten the
securing nuts from the inside of
the load compartment. Close
cover.
Sports Tourer/Country Tourer
1. Release and open the cover in the
tailgate.
Page 231 of 321
Vehicle care229
2. Unscrew three plastic securingnuts by hand.
3. Carefully withdraw the lightassembly from the recesses and
remove.
4. Turn bulb holder anticlockwise and remove. Replace bulb by
withdrawing:
Reverse light 1
Turn signal light 2
Tail light, brake light and rear fog
light are designed as LEDs. In
case of failure, have LEDs
replaced by a workshop.
5. Insert bulb holder into the tail light
assembly and turn clockwise. Fit
light assembly with the retaining
pins into the recesses of the
tailgate and tighten the securing
nuts from the inside of the tailgate. Close cover.
Additional tail lights in the tailgate
frame
1. Open tailgate.
2. Release cover in side trim panel and remove.
Page 237 of 321
Vehicle care235
No.Circuit16Vacuum pump, mass air flow
meter, water in fuel sensor, DC
transformer17–18Adaptive forward lighting19Adaptive forward lighting20Fuel pump21Rear power windows22ABS23Variable effort steering24Front power windows25Power outlets26ABS27Electric parking brake28Heated rear window29Left power seat30Right power seatNo.Circuit31Air conditioning system32Body control module33Heated front seats34Sunroof35Infotainment system36–37Right high beam38Left high beam39–40–41Vacuum pump42Radiator fan43Vehicle battery, DC transformer (only on vehicles with stop-start
system)44Headlamp washer system45Radiator fanNo.Circuit46Terminal 87, main relay47Lambda probe48Fog lights49Right low beam50Left low beam51Horn52Ignition53Ignition, ventilated front seats54Ignition55Power windows, mirror folding56Windscreen washer57–58–59Diesel fuel heating, emission
control system60Mirror heating61Mirror heating
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244Vehicle care9Warning
Use of unsuitable tyres or wheels
may lead to accidents and will
invalidate the vehicle type
approval.
Wheel covers
Wheel covers and tyres that are
factory approved for the respective
vehicle and comply with all of the
relevant wheel and tyre combination requirements must be used.
If the wheel covers and tyres used are
not factory approved, the tyres must
not have a rim protection ridge.
Wheel covers must not impair brake
cooling.
9 Warning
Use of unsuitable tyres or wheel
covers could lead to sudden
pressure loss and thereby
accidents.
Wheel caps
Tyres of size 245/35 R20 have a
specific wheel cap. To remove the
cap from the dismantled wheel first
disengage the arms one by one. Then press the cap in the middle area from
behind and remove it.
To assemble first adjust the wheel
cap in order that the positioning leg
fits into the recess.
Tyre chains
Tyre chains are only permitted on the
front wheels.
Always use fine mesh chains that add no more than 10 mm to the tyre tread
and the inboard sides (including chain lock).9 Warning
Damage may lead to tyre blowout.
5-door Hatchback, 4-door Saloon,
Sports Tourer
Tyre chains are only permitted on
tyres of size 205/60 R 16,
215/60 R 16, 225/55 R 17,
225/45 R 18, 225/50 R 17 and
235/45 R 18.
Country Tourer
Tyre chains are only permitted on
tyres of size 235/45 R 18.
Temporary spare wheel
The use of tyre chains is not permitted on the temporary spare wheel.
Tyre repair kit
Minor damage to the tyre tread can be
repaired with the tyre repair kit.