Page 177 of 247

Driving and operating175Trailer towingTrailer loads
The permissible trailer loads are
vehicle and engine-dependent
maximum values which must not be
exceeded. The actual trailer load is
the difference between the actual
gross weight of the trailer and the
actual coupling socket load with the
trailer coupled.
The permissible trailer loads are
specified in the vehicle documents. In general, they are valid for gradients
up to max. 12 %.
The permitted trailer load applies up
to the specified incline and up to an
altitude of 1000 metres above sea
level. Since engine power decreases
as altitude increases due to the air
becoming thinner, therefore reducing
climbing ability, the permissible gross
train weight also decreases by 10 %
for every 1000 metres of additional
altitude. The gross train weight does
not have to be reduced when driving
on roads with slight inclines (less than
8 %, e.g. motorways).The permissible gross train weight
must not be exceeded. This weight is specified on the identification plate3 226.
Vertical coupling load
The vertical coupling load is the load
exerted by the trailer on the coupling
ball. It can be varied by changing the
weight distribution when loading the
trailer.
The maximum permissible vertical
coupling load (75 kg) is specified on
the towing equipment identification
plate and in the vehicle documents.
Always aim for the maximum load,
especially in the case of heavy
trailers. The vertical coupling load
should never fall below 25 kg.Rear axle load
When the trailer is coupled and the
towing vehicle fully loaded, the
permissible rear axle load (see
identification plate or vehicle
documents) may be exceeded by
100 kg, the gross vehicle weight
rating may be exceeded by 100 kg. If
the permissible rear axle load is
exceeded, a maximum speed of
60 mph applies.
Towing equipmentCaution
When operating without a trailer,
remove the coupling ball bar.
Stowage of coupling ball bar
The coupling ball bar is stowed in a
bag and must be secured in the load
compartment.
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178Driving and operating
Insert 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.9 Warning
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
Page 202 of 247
200Vehicle care
No.Circuit16Boot lid relay17Air conditioning system18Service diagnose19Body control module, brake
lights, tail lights, interior lights20-21Instrument panel22Ignition system23Body control module24Body control module25–26Trunk power outlet accessory
Load compartment fuse
box
The fuse box is on the left side of the
load compartment behind a cover.
Remove the cover.
Fuse assignments
No.Circuit1Soft top control module, power
rail right2–3Parking assist4–5–6–7Power seat8Soft top control module9–10–11Trailer module, tire pressure
monitor and rear view camera12Soft top control module, tail
lights13–14Rear seat electrical folding15–
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243
RRadio Frequency Identification (RFID) ..................................... 239
Radio remote control ...................19
Reading lights ............................ 120
Rear floor storage cover ..............73
Rear fog light ............................... 93
Rear fog lights ........................... 118
Rear storage ................................. 73
Rear view camera ...................... 165
Recommended fluids and lubricants ........................ 224, 228
Refuelling ................................... 172 Retained power off .....................134
Reversing lights .........................119
Ride control systems ..................147
Rollover protection system ...........42
S Seat adjustment ....................... 7, 47
Seat belt ........................................ 8
Seat belt reminder .......................88
Seat belts ..................................... 53
Seat folding .................................. 49
Seat position ................................ 46
Selector lever ............................. 141
Service ............................... 132, 223
Service display ............................ 85
Service information ....................223Side airbag system ......................60
Side blind spot alert ....................164
Sidelights .................................... 110
Side turn signal lights ................194
Soft top ........................................ 33
Spare wheel ............................... 213
Speed limiter............................... 153
Speedometer ............................... 83
Starting and operating ................134
Starting off ................................... 16
Starting the engine ....................135
Steering ...................................... 133
Steering wheel adjustment ......9, 76
Steering wheel controls ...............76
Stop-start system........................ 136
Storage ......................................... 68
Storage compartments .................68
Sunvisor lights ........................... 120
Sun visors .................................... 32
Symbols ......................................... 4
T
Tachometer ................................. 84
Tail lights ................................... 192
Three-point seat belt .................... 55 Tools .......................................... 201
Top-tether fastening eyes ............67
Tow bar....................................... 174 Towing ................................ 174, 218
Towing another vehicle .............219Towing equipment .....................175
Towing the vehicle .....................218
Traction Control system ............. 147
Traction Control system off........... 91
Traffic sign assistant ...................167
Trailer coupling ........................... 174
Trailer towing ............................. 175
Transmission ............................... 15
Transmission display .................141
Tread depth ............................... 206
Trip odometer .............................. 84
Turn and lane-change signals ...117
Turn signal ................................... 88
Tyre chains ................................ 207
Tyre designations ......................203
Tyre pressure ............................ 203
Tyre pressure monitoring system ............................... 92, 204
Tyre pressures ........................... 236
Tyre repair kit ............................. 208
U Ultrasonic parking assist............. 156
Upholstery .................................. 222
Upshift .......................................... 91
Using this manual ..........................3
V Vehicle battery ........................... 185
Vehicle checks............................ 181