Page 211 of 283

Driving and operating209Insert the tensioned coupling ball bar
in the opening and push firmly
upwards until it audibly engages.
The rotary handle snaps back into its
original position resting against the
coupling ball bar without a gap.9 Warning
Do not touch rotary handle during
insertion.
Lock the coupling ball bar by turning
the key to position e. Remove the key
and close the protective flap.
Eye for break-away stopping cable
Attach breakaway stopping cable to
eye.
Check that the coupling ball bar is correctly installed
● Green marking on rotary knob must point towards green
marking on coupling ball bar.
● There must be no gap between the rotary handle and the
coupling ball bar.
● The coupling ball bar must be firmly engaged in the opening.
● The coupling ball bar must be locked and the key removed.9Warning
Towing a trailer is permitted only
when a coupling ball bar is fitted correctly. If the coupling ball bardoes not engage correctly, seekthe assistance of a workshop.
Dismounting the coupling ball bar
Open the protective flap and turn the
key to position c to unlock the
coupling ball bar.
Pull out rotary handle and turn
clockwise as far as it will go. Pull out coupling ball bar downwards.
Insert sealing plug in opening. Fold away socket.
Trailer stability assist
If the system detects snaking
movements, engine power is reduced
and the vehicle / trailer combination is
Page 212 of 283
210Driving and operatingselectively braked until the snaking
ceases. While system is working keep
steering wheel as still as possible.
Trailer stability assist is a function of
the Electronic Stability Control 3 157.
Page 231 of 283
Vehicle care229No.Circuit1Electronic key system / Anti-
theft alarm system4Stop-start system5Advanced parking assist /
Camera / Transmission control
module7Amplifier8Rear wiper10Central locking system11Central locking systemNo.Circuit13Anti-theft alarm system16Electrical power steering wheel18BTA module21Interior lights22Glovebox light23Blind spot alert system / Exterior
mirror adjustment / Inductive
charging24Column electrical assembly25Interior mirror26Seat belt reminder27Camera / Rain sensor / Auto‐
matic light control28USB / Infotainment31Airbag33Power outlet front36InfotainmentNo.Circuit1Interior mirror / Electrical power
steering wheel / Selective ride
control / Radar / Diesel exhaust
system3Trailer provisions control
module4Horn5Windscreen washer6Windscreen washer7Power outlet rear10Doors lock / Tailgate lock
Page 253 of 283

Service and maintenance251Service and
maintenanceGeneral information ...................251
Service information ..................251
Recommended fluids, lubricants and parts .................................... 255
Recommended fluids and lubricants ................................ 255General information
Service information In order to ensure economical and
safe vehicle operation and to
maintain the value of your vehicle, it
is of vital importance that all
maintenance work is carried out at the proper intervals as specified.
The detailed, up-to-date service
schedule for your vehicle is available
at the workshop.
Severe operating conditions exist if one or more of the following
circumstances occur frequently: Cold
starting, stop and go operation, e.g.
for taxis and police vehicles, trailer
operation, mountain driving, driving
on poor and sandy road surfaces,
increased air pollution, presence of
airborne sand and high dust content,
driving at high altitude and large
variations of temperature.Under these severe operating
conditions, certain service work may
be required more frequently than the
regular service interval indicated in
the service display. Contact a
workshop for customised service
schedules.
Service display 3 92.
Confirmations Confirmation of service is recorded inthe Service and warranty booklet.
The date and mileage is completed
with the stamp and signature of the
servicing workshop.
Make sure that the Service and
warranty booklet is completed
correctly as continuous proof of
service is essential if any warranty or
goodwill claims are to be met, and is
also a benefit when selling the
vehicle.
Page 282 of 283

280T
Tachometer ................................. 90
Tailgate ......................................... 30
Tail lights ................................... 222
Three-point seat belt .................... 53
Tools .......................................... 230
Tow bar....................................... 206
Towing ................................ 206, 245
Towing another vehicle .............247
Towing equipment .....................207
Towing the vehicle .....................245
Trailer coupling ........................... 206
Trailer stability assist .................209
Trailer towing ............................. 206
Transmission ............................... 18
Transmission display .................148
Tread depth ............................... 234
Trip odometer .............................. 90
Turn lights ............................ 93, 118
Tyre chains ................................ 235
Tyre deflation detection system . 233
Tyre designations ......................232
Tyre pressure ............................ 232
Tyre pressures ........................... 267
Tyre repair kit ............................. 236
U Ultrasonic parking assist............. 177
Upholstery .................................. 249USB port....................................... 85
Using this manual ..........................3
V Vehicle battery ........................... 217
Vehicle checks............................ 214
Vehicle data ................................ 259
Vehicle data recording and privacy ..................................... 272
Vehicle detected ahead ..............100
Vehicle dimensions .................... 265
Vehicle identification number ....257
Vehicle jack ................................ 230
Vehicle messages .....................107
Vehicle personalisation .............108
Vehicle security ............................ 35
Vehicle specific data ......................3
Vehicle storage ........................... 213
Vehicle tools ............................... 230
Vehicle unlocking ........................... 6
Ventilating ..................................... 51
Ventilation ........................... 123, 131
W
Warning chimes .........................107
Warning lights ............................... 90
Warning triangle .......................... 76
Washer and wiper systems .........14
Washer fluid ............................... 216
Wheel changing .........................239
Wheel covers ............................. 235Wheels and tyres .......................231
Windows ....................................... 39
Windscreen................................... 39
Windscreen wiper and washer ....81
Winter tyres ............................... 231
Wiper blade replacement ..........219
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