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224Driving and operatingA 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 is a function
of the Electronic Stability Control
3 176.
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Vehicle care225Vehicle careGeneral Information...................226
Accessories and vehicle modifications .......................... 226
Vehicle storage ........................226
End-of-life vehicle recovery .....227
Vehicle checks ........................... 227
Performing work ......................227
Bonnet ..................................... 227
Engine oil ................................. 228
Automatic transmission fluid ....229
Engine coolant ......................... 230
Power steering fluid .................231
Washer fluid ............................ 231
Brakes ..................................... 232
Brake fluid ............................... 232
Vehicle battery ......................... 232
Diesel fuel system bleeding .....234
Wiper blade replacement ........234
Bulb replacement .......................235
Halogen headlights ..................236
Xenon headlights .....................238
Fog lights ................................. 240
Tail lights ................................. 241
Side turn signal lights ..............243
Number plate light ...................244Interior lights ............................ 245
Instrument panel illumination ...245
Electrical system ........................245
Fuses ....................................... 245
Engine compartment fuse box . 247
Instrument panel fuse box .......249
Load compartment fuse box ....250
Vehicle tools .............................. 252
Tools ........................................ 252
Wheels and tyres .......................253
Winter tyres ............................. 253
Tyre designations ....................253
Tyre pressure .......................... 253
Tyre pressure monitoring system .................................... 255
Tread depth ............................. 256
Changing tyre and wheel size . 257
Wheel covers ........................... 257
Tyre chains .............................. 258
Tyre repair kit .......................... 258
Wheel changing .......................261
Spare wheel ............................ 263
Jump starting ............................. 266
Towing ....................................... 267
Towing the vehicle ...................267
Towing another vehicle ...........269Appearance care .......................271
Exterior care ............................ 271
Interior care ............................. 273
Page 233 of 327
Vehicle care231General9Warning
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
approved 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.
Power steering fluid
Caution
Extremely small amounts of
contamination can cause steering
system damage and cause it to not
work properly. Do not allow
contaminates to contact the fluid
side of the reservoir cap/dipstick or
from entering the reservoir.
Power steering fluid level normally
does not have to be checked. If an
unusual noise sounds during steering or the power steering reacts
conspicuous seek the assistance of a
workshop.
Washer fluid
Fill with clean water mixed with a
suitable quantity of approved
windscreen washer fluid which
contains antifreeze.
Page 250 of 327

248Vehicle careNo.Circuit16Vacuum pump/Mass air flow
meter/Water in fuel sensor/DC
transformer17Additional tail lights (type B)18Adaptive forward lighting19Adaptive forward lighting20Fuel pump21Rear power windows22ABS23Variable effort steering24Front power windows25Power outlets (type A)
Additional tail lights (type B)26ABS27Electric parking brake28Heated rear window29Left power seat30Right power seatNo.Circuit31Air conditioning system32Body control module33Heated front seats34Sunroof (type A)
Tailgate locking (type B)35Infotainment system (type A)
Tailgate locking (type B)36–37Right high beam38Left high beam39–40–41Vacuum pump42Radiator fan43Vehicle battery/DC transformer
(only on vehicles with stop-start
system)44Headlamp washer systemNo.Circuit45Radiator fan46Terminal 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
Page 251 of 327
Vehicle care249No.Circuit62Heated steering wheel (only
vehicles without load compart‐
ment fuse box)63Rear window sensor64Adaptive forward lighting65Auxiliary pump (only on vehicles
with stop-start system)66Rear window washer system67Fuel system control module68–69Vehicle battery sensor70Rain sensor71Vehicle battery sensor
After changing of defective fuses,
close the fuse box cover and press
until it engages.
If the fuse box cover is not closed
correctly, malfunctions may occur.
Instrument panel fuse box
In left-hand drive vehicles, the fuse
box is behind the storage
compartment in the instrument panel.
Open compartment, compress the
locking tabs, fold compartment down and remove.
In right-hand drive vehicles, the fuse
box is located behind a cover in the
glovebox. Open the glovebox and
remove the cover.
Page 252 of 327
250Vehicle careNo.Circuit1Infotainment system/Info
display/Anti-theft alarm system2Body control unit3Body control unit4Infotainment system/Info
display5Infotainment system/Info
display/High beam assist6Cigarette lighter7Power outlet8Body control unit9Body control unit10Body control unit11Interior fan12–13–14Diagnostic connector15AirbagNo.Circuit16Central locking system/Tailgate17Air conditioning system18Transportation fuse19Memory20–21Instrument22Ignition/Central locking system/
Electronic key system23Body control unit24Body control unit25Steering wheel control26Power outlet load compartment
Power seats, No's. 12 and 13, have
an overload protection. The circuit will
be closed again after cooling down.
Load compartment fuse box
The fuse box is on the left side of the
load compartment behind a cover.
Remove the cover.
Page 253 of 327
Vehicle care251No.Circuit1Central locking system/Elec‐
tronic key system2Trailer module (type A)
Infotainment system (type B)3–4–5Trailer socket6Heated steering wheel (only
vehicles with load compartment
fuse box)7Selective catalytic reduction
system8Trailer socket9Sunroof10Central locking system/Tailgate
(type A)
Sunroof (type B)11–12Selective catalytic reduction
systemNo.Circuit13–14–15Power tailgate lock16Air conditioning system17Selective catalytic reduction
system18Selective catalytic reduction
system19Side obstacle detector20Side obstacle detector/Venti‐
lated front seats21Active damping system/Cruise
control/Traffic sign assistant/
Lane departure warning/Trailer
module22–23All-wheel drive/Anti-theft alarm
system24–25–
Page 260 of 327

258Vehicle careTyre 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 215/60 R16,
225/50 R17 and 235/45 R18.
Country Tourer
Tyre chains are only permitted on
tyres of size 235/45 R18.
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.
Do not remove foreign bodies from
the tyres.
Tyre damage exceeding 4 mm or that
is at tyre's side wall cannot be
repaired with the tyre repair kit.9 Warning
Do not drive faster than 50 mph.
Do not use for a lengthy period.
Steering and handling may be
affected.
If you have a flat tyre:
Apply the parking brake and engage
first gear, reverse gear or P.
The tyre repair kit is in a compartment
under the floor cover in the load
compartment.
1. Take the tyre repair kit from the compartment.
2. Remove the compressor.