Page 197 of 273

Driving and operating195Insert 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 198 of 273
196Driving 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 3 150.
Page 217 of 273
Vehicle care215No.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 wheel18OnStar21Interior 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 240 of 273
238Service and maintenanceGeneral 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 inthe service display. Contact a
workshop for customised service
schedules.
Service display 3 91.
Page 271 of 273

269Power outlets ............................... 85
Power seat adjustment ................49
Power windows ............................ 40
Preheating ................................... 96
Puncture ..................................... 226
Q
Quickheat ................................... 127
R Radio Frequency Identification (RFID) ..................................... 264
Radio remote control ...................22
Rain sensor .................................. 98
REACH ....................................... 258
Reading lights ............................ 117
Rear floor storage cover ..............73
Rear fog light ...............98, 115, 208
Rear seats .................................... 52
Rear view camera ...................... 182
Rear window wiper and washer ..83
Recommended fluids and lubricants ........................ 242, 246
Refuelling ................................... 190 Registered trademarks ...............261
Reversing lights .........................116
Ride control systems ..................150
Roadside assistance ..................107
Roller blinds ................................. 43
Roof .............................................. 43Roof load...................................... 77
Roof rack ..................................... 76
S Safety net .................................... 74
Seat adjustment ............................. 7
Seat belt ........................................ 8
Seat belt reminder .......................92
Seat belts ..................................... 52 Seat heating ................................. 51
Seat heating, rear .....................52
Seat position ................................ 46
Selective catalytic reduction .......139
Selective ride control ..................151
Selector lever.............................. 143
Service ............................... 129, 238
Service display ............................ 91
Service information ....................238
Service vehicle soon .................... 94
Side airbag system ......................59
Side blind spot alert ..............98, 178
Sidelights .................................... 109
Side turn lights ........................... 211
Software acknowledgement .......259
Software update ......................... 260
SOS ............................................ 107
Spare wheel ............................... 226
Speed limiter......................... 99, 156
Speedometer ............................... 89
Sport mode ................................ 152Starting and operating ................131
Starting off ................................... 18
Starting the engine ....................133
Steering ...................................... 131
Steering wheel adjustment ......9, 80
Steering wheel controls ...............80
Stop engine .................................. 94
Stop-start system........................ 135
Storage ......................................... 69
Storage compartments .................69
Sunvisor lights ........................... 117
Sun visors .................................... 43
Symbols ......................................... 4
System check ............................... 94
T Tachometer ................................. 90
Tailgate ......................................... 30
Tail lights ................................... 208
Three-point seat belt .................... 53
Tools .......................................... 216
Tow bar....................................... 192
Towing ................................ 192, 231
Towing another vehicle .............232
Towing equipment .....................193
Towing the vehicle .....................231
Trailer coupling ........................... 192
Trailer stability assist .................195
Trailer towing ............................. 192
Transmission ............................... 18
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