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220Driving and operating
Stow the coupling ball bar in the bag
and secure by fixing the strap through the rear right lashing eye. Wrap
around twice and tighten the strap to
secure the bag.
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 assist is a function of
the Electronic Stability Control 3 173.
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228Vehicle carewhen using a battery charger.
Otherwise the vehicle battery may be damaged.
Jump starting 3 262.
Discharge protection
Battery voltage
When the vehicle battery voltage is running low, a warning message will
appear in the Driver Information
Centre.
When the vehicle is being driven, the
load reduction function temporarily
deactivates certain functions, e.g. the heated rear window.
The deactivated functions are
reactivated automatically as soon as
conditions permit.
Idle boost
If charging of the vehicle battery is
required due to battery condition, the
power output of the generator must be increased. This will be achieved by
an idle boost which may be audible.
A message appears in the Driver
Information Centre.
Power outlet
The power outlets are deactivated in
the event of low vehicle battery
voltage.
Warning label
Meaning of symbols: ● No sparks, naked flames or smoking.
● Always shield eyes. Explosive gases can cause blindness or
injury.
● Keep the vehicle battery out of reach of children.
● The vehicle battery containssulphuric acid which could cause
blindness or serious burn
injuries.
● See the Owner's Manual for further information.
● Explosive gas may be present in the vicinity of the vehicle battery.
Diesel fuel system bleeding If the tank has been run dry, the diesel
fuel system must be bled. Switch on
the ignition three times for
15 seconds at a time. Then crank the
engine for a maximum of 40 seconds. Repeat this process after
no less than 5 seconds. If the engine fails to start, seek the assistance of a
workshop.
Page 231 of 303
Vehicle care229Wiper blade replacement
Windscreen
Lift the wiper arm until it stays in the
raised position, press button to
disengage the wiper blade and
remove.
Attach the wiper blade slightly angled
to the wiper arm and push until it
engages.
Lower wiper arm carefully.
Rear window
Lift wiper arm. Disengage wiper blade as shown in illustration and remove.
Attach the wiper blade slightly angled
to the wiper arm and push until it
engages.
Lower wiper arm carefully.
Bulb replacement
Switch off the ignition and switch off
the relevant switch or close the doors.
Only hold a new bulb at the base. Do not touch the bulb glass with bare
hands.
Use only the same bulb type for
replacement.
Replace headlight bulbs from within
the engine compartment.
Bulb check
After a bulb replacement switch on
the ignition, operate and check the
lights.
Halogen headlights Halogen headlights with separate
bulbs for low beam and high beam.
Page 237 of 303
Vehicle care235On version with LED tail lights, theposition of the retaining lugs is
slightly different.
6. Remove and replace the bulb:
Tail light ( 1)
Rear fog light ( 2) (left side)
Reverse light ( 2) (right side)
On version with LED tail lights
only reverse light bulb ( 1) can be
removed and replaced.
7. Insert the bulb carrier into the tail light assembly. Attach plug to the
light assembly. Fit light assembly
on the tailgate and tighten the
screw from the inside. Attach
cover.
Depending on the version, tail lights are designed as LEDs. In case of failure, have LEDs replaced by aworkshop.
Sports Tourer
1. Release and open the cover on the respective side.
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238Vehicle care5. Remove and replace the bulb:Reverse light ( 1)
Tail light ( 2)
Rear fog light ( 3) (left side)
6. Insert the bulb carrier into the tail light assembly.
7. On version with LED tail lightsonly reverse light bulb can be
replaced: remove bulb holder in
the light assembly by turning.
Replace bulb in the bulb holder.
8. Fit light assembly on the tailgate and tighten the securing nut from
the inside. Attach cover.
Depending on the version, tail lights
are designed as LEDs. In case of
failure, have LEDs replaced by a
workshop.
Side turn lights To replace bulb, remove lamp
housing:
1. Slide the lamp housing forward and remove it at the back.
2. Turn bulb holder anticlockwiseand remove from housing.
3. Pull bulb from bulb holder and replace it.
Page 244 of 303

242Vehicle careNo.Circuit16Fuel injection17Fuel injection18Diesel exhaust system19–20–21–22ABS23Washer system for windscreen
and rear window24–25Diesel fuel heating26Transmission control module27Power tailgate module28–29Heated rear window30Mirror defrost31–No.Circuit32DC transformer / LED display /
Electrical heater / Climate
control / Glow plug controller33–34Horn35Engine control module36Right high beam (Halogen, Eco
LED) / Right low beam (LED)37Left high beam (Halogen, Eco
LED)38LED headlight / Automatic
headlight range adjustment39Front fog light40Central Gateway Module41–42Manual headlight range adjust‐
ment43Fuel pump44Rear view camera / Inside rear
view mirror / Trailer moduleNo.Circuit45LED headlight left / Automatic
headlight range adjustment left46Instrument cluster47Steering column lock48Rear wiper49Outside rearview mirror50LED headlight right / Automatic
headlight range adjustment
right51Left low beam (LED)52Engine control module / Trans‐
mission control module53Windscreen wiper54Windscreen wiper55Diesel Exhaust system56–57–
After having changed defective fuses,
close the fuse box cover and press
until it engages.
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Vehicle care243If the fuse box cover is not closed
correctly, malfunction may occur.
Instrument panel fuse box The fuse box is located behind a
cover.
Pull the cover on the left side to
remove.
No.Circuit1Rear seat heating (only for vehi‐ cles without alarm horn)2Climate control system / fan3Power seat driver side4Power seat passenger side5ABS6Power window front7–8Heated steering wheel9Body control module 810Power window rear11Sunroof12Body control module 613Seat heating (only on vehicles
without alarm horn)14Exterior mirror15Body control module 116Body control module 7
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244Vehicle careNo.Circuit17Body control module 418Body control module 319Data link connector20Airbag system21Climate control system22Central locking system / tailgate23Electronic key system24Power seat memory function25Airbag system steering wheel26Ignition switch / Steering
column lock27Body control module 228USB socket29Cigarette lighter / Power outlet
front30Selector lever31Rear window wiper32Transmission control moduleNo.Circuit33Anti-theft alarm system / Power
sounder34Parking assist / Side blind spot
alert / Infotainment system /
USB socket35SOS36Info Display / Instrument cluster37Infotainment system / radio
After having changed defective fuses,
close the fuse box cover:
1. Apply the cover on the right side.
2. Fold the left side of the cover forwards. Take care that thesecuring clamp is guided as
shown in the illustration.
Load compartment fuse box The fuse box is located on the left side
of the load compartment behind a
cover.
Remove the cover.