Page 210 of 283
208Driving and operatingChecking the tensioning of the
coupling ball bar
● Red marking on rotary knob must
point towards green marking on
coupling ball bar.
● The gap between the rotary knob
and the coupling ball bar must be approx. 6 mm.
● Remove the cover from the lock of the rotary knob and verify
whether the rotary knob is
locked. If the rotary knob cannot be turned, it is locked.
Otherwise, the coupling ball bar must be tensioned before being inserted:
● Unlock coupling ball bar by turning key to position c.● Pull out rotary knob and turn
clockwise as far as it will go.
Inserting the coupling ball bar
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 225 of 283
Vehicle care223
2.Slacken the light fixing nut using a
box spanner or socket.
To avoid losing the nut if it drops
into the wing trim, first place a
cloth below it.
3. Manually unscrew and remove the light fixing nut.
4. Disengage the retaining clip, while pushing the light out slightly.5. From the outside, carefullywithdraw the light assembly from
recess and remove. Take care
that the cable duct remains in
position.
6. Turn the bulb socket anticlockwise and remove it from
the light assembly.7. Detach the bulb from the bulb socket and replace the bulb.
Brake light( 1)
Page 226 of 283
224Vehicle care
Turn light (2)
8. Insert the bulb socket into the light
assembly. Fit the light assembly in the recess and tighten the light
fixing nut from the inside. Attach
the cover.
Light assembly in the tailgate
1. Open the tailgate and remove the
cover.
2. Slacken the light fixing nut using a
box spanner or socket.
3. Manually unscrew and remove the light fixing nut.
4. Disengage the retaining clip, while pushing the light assembly
out slightly.
5. From the outside, carefully withdraw light assembly from
recess and remove. Take care
that the cable duct remains in
position.
6. Turn the bulb socket anticlockwise and remove it from
the light assembly.
Page 228 of 283

226Vehicle care
2. Turn bulb socket clockwise andremove from light assembly.
3. Detach the bulb from the bulbsocket and replace the bulb.
4. Insert bulb socket and turnanticlockwise.
5. Insert left end of the light assembly, slide to the left and
insert right end.
Number plate light
Number plate lights are designed as LEDs and can not be changed.
Have lights repaired by a workshop in
case of failure.
Interior lights
Have the following bulbs replaced by
a workshop:
● courtesy light, reading lights
● load compartment light
● instrument panel illuminationElectrical system
Fuses Data on the replacement fuse mustmatch the data on the defective fuse.
There are two fuse boxes in the
vehicle:
● engine compartment
● instrument panel
Before replacing a fuse, turn off the
respective switch and the ignition.
A blown fuse can be recognised by its melted wire.Caution
Do not replace the fuse until the
cause of the fault has been
remedied.
Some functions are protected by
several fuses.
Fuses may also be inserted without
existence of a function.
Page 279 of 283

277Charging status.......................... 199
Charging system .......................... 95
Child locks ................................... 29
Child restraint installation locations ................................... 65
Child restraints.............................. 62
Child restraint systems ................62
Cigarette lighter ........................... 88
Climate control ............................. 16
Climate control systems .............123
Clock............................................. 84
Collision damage repair ..............271
Control indicators.......................... 93
Control of the vehicle .................135
Controls ........................................ 80
Convex shape .............................. 37
Coolant and antifreeze ...............255
Cruise control ....................100, 160
Cupholders .................................. 69
Curtain airbag system .................. 60
Curve lighting.............................. 115
D Danger, Warnings and Cautions ...4
Daytime running lights ...............115
Declaration of conformity ............269
DEF ............................................ 143
Deflation detection system ...........99
Diesel exhaust fluid ....................143
Diesel fuel system bleeding .......219Door open .................................. 101
Doors ............................................ 30
Drive modes ............................... 152
Driver alert .................................. 194
Driver assistance systems ..........160
Driver Information Centre ...........101
Driving characteristics and towing tips .............................. 206
Driving hints ................................ 135
E Electric adjustment ......................37
Electrical system......................... 226
Electric parking brake ...96, 153, 154
Electric parking brake fault ...........96
Electronic climate control system 127
Electronic driving programmes ..150
Electronic key system ...................23
Electronic Stability Control and Traction Control system ....97, 157
Electronic Stability Control and Traction Control system off .......98
Emergency call ........................... 111
End-of-life vehicle recovery .......213
Engine compartment fuse box ...227
Engine coolant ........................... 216
Engine coolant temperature ........98
Engine coolant temperature gauge ....................................... 92
Engine data ............................... 261Engine exhaust .......................... 142
Engine identification ...................258
Engine oil ................... 215, 255, 259
Engine oil level monitor ................92
Engine oil pressure ......................99
Entry lighting .............................. 122
Event data recorders ..................272
Exhaust filter ......................... 98, 142
Exit lighting ................................ 122
Exterior care .............................. 247
Exterior light ................................. 99
Exterior lighting ....................13, 113
Exterior mirrors ............................. 37
F
Fault ........................................... 150
First aid ......................................... 76
First aid kit ................................... 76
Fixed air vents ........................... 133
Floor mats................................... 250
Folding mirrors ............................. 38
Forward collision alert................. 171
Front airbag system .....................59
Front fog lights ...........100, 119, 222
Front pedestrian protection ........176
Front seats.................................... 46
Fuel............................................. 202
Fuel for diesel engines ..............203
Fuel for petrol engines ...............202