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Troubleshooting
286 Problem Possible cause/consequence Suggested solutions
The yellow reserve fuel warning
lamp comes on while the engine
is running. The fuel level has fallen below the
reserve range. The operation of
the auxiliary heating* can no lon-
ger be guaranteed. X
Refuel at the nearest filling station. Warning tones
Problem Possible cause/consequence Suggested solutions
The anti-theft warning alarm* is
triggered. You have opened the vehicle
using the emergency key element
without deactivating the anti-
theft alarm system* first. X
Switch off the alarm (Y page 63).You hear a warning tone. A message appears in the multi-
function display. X
See the explanations for the display message (Y page 255).You hear a warning tone. You are driving with the parking
brake applied. X
Release the parking brake. You hear a warning tone. You did not switch off the lights
when leaving the vehicle. X
Turn the light switch to MorU.
or
X If the rear foglamp is switched on: press the light switch in as far
as it will go. Practical advice
* optional
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Troubleshooting
293Parktronic*
Problem Possible cause/consequence Suggested solutions
Only the red segments in the
Parktronic warning display are lit.
You also hear a warning tone for
approximately two seconds.
Parktronic is deactivated after
approximately 20 seconds and
the indicator lamp in the Park-
tronic button lights up. Parktronic has malfunctioned
and has switched itself off. X
If problems persist, have Parktronic checked at a qualified spe-
cialist workshop. Only the red segments in the
Parktronic warning display are lit.
Parktronic is deactivated after
approximately 20 seconds. The Parktronic sensors are dirty
or there is interference. X
Clean the Parktronic sensors ( Ypage 247).
X Switch the ignition back on. Only the red segments in the
Parktronic warning display are lit.
Parktronic is deactivated after
approximately 20 seconds. The problem may be caused by an
external source of radio or ultra-
sound waves. X
See if Parktronic functions in a different location. Practical advice
* optional
251_AKB; 5; 7, en-GB
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Page 308 of 373

Changing the batteries
305Key or KEYLESS GO key*
Checking the batteries X
Press the jork button.
The batteries are in order if the battery
charge indicator lamp lights up briefly.
Changing the batteries You require two CR 2025 3 V cell batteries.
X
Remove the emergency key element from
the key (Y page 302). 1
Emergency key element
2 Battery tray X
Insert emergency key element 1into the
opening in the key and push in the direction
of the arrow.
Battery tray 2is released.
X Pull battery tray 2out of the key. 1
Batteries
X Remove old batteries 1from the battery
tray.
X Insert the new batteries beneath the con-
tact spring with the positive terminal facing
upwards. Use a lint-free cloth to do so.
X Push the battery tray back into the key
housing until the battery tray engages.
X Check the function of all key buttons on the
vehicle. Auxiliary heating* remote control
One 6V pin battery, type 2CR11108 is
required. 1
Battery
2 Battery cover
X Prise apart the side arms of battery cover
2 and slide off battery cover 2.
X Remove old battery 1.
X Insert the new battery. Observe the polarity
signs on the back of the remote control
when doing so.
X Slide battery cover 2back onto the
remote control.
X Use the remote control to check the vehi-
cle's auxiliary heating functions. Practical advice
* optional
251_AKB; 5; 7, en-GB
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Changing the bulbs
307
Front bulbs Bulb Type
1 Side lamp/park-
ing lamp W 5 W
2 Turn signal lamp PY 21 W
3 Additional turn
signal lamp
LEDs
35 4 Dipped-beam
headlamps
H7 55 W
36
or
D1S 35 W* 37 5 Main-beam
headlamps
36
/
Main-beam
spotlight* 38 H7 55 W
6 Front foglamps
with cornering
light function* H7 55 W Rear bulbs
Bulb Type
7 Third brake
lamp
LED
35 8 Brake lamp/tail
lamp/parking
lamp P 21 W
9 Turn signal lamp PY 21 W
a Reversing lamp P 21 W
b
Rear foglamp* P 21 W
c Licence plate
lamp C 5 W
Before changing bulbs
You can replace the following bulbs:
R
Dipped-beam headlamps (vehicles with
halogen headlamps)
R Main-beam headlamps (vehicles with halo-
gen headlamps) R
Side lamp and parking lamp
R Front foglamps with cornering light func-
tion*
R Turn signal lamp (front)
R Reversing lamp
R Brake lamp/tail lamp/parking lamp
R Rear fog lamp
R Turn signal lamp (rear)
R Licence plate lamp
Observe the following points:
R Use only the bulb types specified here.
R To prevent a short-circuit, switch off the
lights before changing a bulb.
R Only hold bulbs with a clean, lint-free cloth.
R Do not work with wet or greasy fingers.
R If the new bulb still does not light up, con-
sult a qualified specialist workshop, e.g. a
Mercedes-Benz Service Centre.
35 These bulbs must be replaced at a qualified specialist workshop, e.g. a Mercedes-Benz Service Centre.
36 Vehicles with halogen headlamps.
37 Vehicles with xenon headlamps*: always have these bulbs changed at a qualified specialist workshop, e.g. a Mercedes-Benz Service Centre.
38 Vehicles with bi-xenon headlamps* Practical advice
* optional
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Changing the bulbs
308
i
Have the headlamp setting checked reg-
ularly at a qualified specialist workshop,
e.g. a Mercedes-Benz Service Centre. Changing the front bulbs
Replacing dipped-beam headlamps
(vehicles with halogen headlamps) 1
Housing cover for dipped-beam headlamp
2 Bulb holder for dipped-beam headlamp
X Switch off the lights.
X Open the bonnet.
X Turn housing cover 1anti-clockwise and
remove it.
X Turn bulb holder 2anti-clockwise and pull
it out.
X Pull the bulb out of bulb holder 2.X
Insert the new bulb into bulb holder 2.
X Insert bulb holder 2and turn it clockwise.
X Align housing cover 1and turn it clock-
wise.
Replacing the bulb in the main-beam
(vehicles with halogen headlamps) 1
Housing cover for main-beam headlamp
2 Bulb holder for main-beam headlamp
X Switch off the lights.
X Open the bonnet.
X Turn housing cover 1anti-clockwise and
remove it.
X Turn bulb holder 2anti-clockwise and pull
it out.
X Pull the bulb out of bulb holder 2.X
Insert the new bulb into bulb holder 2.
X Insert bulb holder 2and turn clockwise
until it engages.
X Place housing cover 1back on and turn it
clockwise until it engages.
Replacing side/parking lamp bulbs 1
Bulb holder for side/parking lamp
X Switch off the lights.
X Open the bonnet.
X Turn bulb holder 1anti-clockwise and pull
it out.
X Pull the bulb out of bulb holder 1.
X Insert the new bulb into bulb holder 1.
X Insert bulb holder 1and turn it clockwise. Practical advice
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Changing the bulbs
309
Replacing the bulbs in foglamps with
cornering light function* 1
Front foglamp
2 Cover
3 Cover screws
4 Foglamp screws
X Switch off the lights.
X Remove screws 3.
X Remove cover 2.
X Remove screws 4.
X Remove front foglamp 1from the bumper. 5
Bulb holder for front foglamp
i If necessary, reconnect the additional
cable during installation.
X Turn bulb holder 5anti-clockwise and pull
it out.
X Pull the bulb out of bulb holder 5.
X Insert the new bulb into bulb holder 5.
X Insert bulb holder 5and turn clockwise
until it engages.
X Insert front foglamp 1into the bumper.
X Replace screws 4of front foglamp 1.
X Position cover 2.
X Fasten screws 3into cover 2. Replacing the turn signal lamps
1
Bulb holder for turn signal
X Switch off the lights.
X Open the bonnet.
X Turn bulb holder 1anti-clockwise and pull
it out.
X Turn the bulb anti-clockwise, applying
slight pressure, and remove it from bulb
holder 1.
X Insert the new bulb into bulb holder 1and
turn clockwise while applying slight pres-
sure.
X Insert bulb holder 1and turn clockwise
until it engages. Practical advice
* optional
251_AKB; 5; 7, en-GB
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Changing the bulbs
310 Changing the rear bulbs
Opening and closing the side trim pan-
els You must open the side trim panel in the load
compartment before changing the bulbs in
the tail lamps. Left-hand side trim panel
1
Release catch
2 Side trim panel Right-hand side trim panel
1
Release catch
2 Side trim panel
X To open: insert a suitable object, e.g. a
coin, into the slot of release catch 1on
side trim panel 2.
X Turn release catch 190° in the direction
of the arrow and remove side trim panel
2.
X To close: insert side trim panel 2and turn
catch 190° in the opposite direction to
the arrow. Changing the tail lamps X
Switch off the lights.
X Open the luggage compartment.
X Open the side trim panel (Y page 310). Tail lamps
1
Brake lamp/tail lamp/parking lamp
2 Turn signal lamp
3 Rear fog lamp
4 Reversing lamp
X Turn the corresponding bulb holder anti-
clockwise and remove it.
X Take the bulb out of the bulb holder.
X Insert the new bulb into the bulb holder.
X Insert the bulb holder and turn it clockwise.
X Close the side trim panel (Y page 310).Practical advice
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Replacing the wiper blades
311
Changing the bulbs in the licence plate
lamps
Licence plate lamp
1
Screws
X Switch off the lights.
X Open the tailgate.
X Remove screws 1.
X Remove the licence plate lamp.
X Replace the bulb.
X Insert the licence plate lamp.
X Replace and tighten screws 1. Replacing the wiper blades
Windscreen wiper blades
G
Risk of accident
The windscreen will not longer be properly
wiped if the wiper blades are worn. This
could prevent you from observing the traffic
conditions, thereby causing an accident.
Replace the wiper blades twice a year, ide-
ally in spring and autumn. G
Risk of accident
The wiper arms could start moving and
cause an injury if you leave the windscreen
wipers switched on.
Remove the key from the ignition lock
before replacing the wiper blades.
! Make sure that you touch only the wiper
arm of the windscreen wiper to avoid dam-
aging the windscreen wiper blades. Removing 1
Wiper blade
2 Release clips
3 Folding direction
4 Wiper arm
5 To remove the wiper blade
X Remove the key from the ignition lock.
X Fold wiper arm 4away from the wind-
screen until it engages.
X Press both release clips 2.
X Fold wiper blade 1in the direction of
arrow 3.
X Remove the wiper blade in the direction of
arrow 5. Practical advice
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