Checking the battery electrolyte levelFig. 172
Vehicle battery: Electrolyte level
indicator
Read and observe and on page 157 first.
On vehicles with a vehicle battery fitted with a colour indicator, the electrolyte
level can be determined by looking at the change in colour of this display.
Air bubbles can influence the colour of the indicator. For this reason carefully
knock on the indicator before carrying out the check.
Check
Black colour - electrolyte level is correct.
Colourless or light yellow colour - electrolyte level too low, the battery must be
replaced.
For technical reasons, on vehicles with the description “AGM”, the electrolyte
level cannot be checked.
Vehicles with a START-STOP system are fitted with a system for checking the
energy level for recurring engine start.
We recommend you have the electrolyte level checked by a specialist garage
from time to time, especially in the following cases. ▶ High external temperatures.
▶ Longer day trips.
▶ After each charge.
Winter time
The vehicle battery only has some of its starting power at low temperatures. A
discharged vehicle battery may freeze at temperatures just below 0 °C .
We therefore recommend that you have the battery checked and, if necessary,
recharged by a specialist garage before the start of the winter.
NoteThe battery electrolyte level is also periodically checked by a specialist garage
as part of the Inspection Service.
Charging
Read and observe
and on page 157 first.
A properly charged vehicle battery is essential for reliably starting the engine.A charging operation can be performed if the following conditions are satis-
fied.
The engine is turned off.
The ignition is switched off.
All consumers are turned off.
The bonnet is open.
“Fast charging” with high currents
›
Disconnect both battery cables (first of all “negative”, then “positive”).
›
Attach the terminal clamps of the charger to the battery terminals (red =
“positive”, black = “negative”).
›
Plug the mains cable of the charger into the power socket and switch the
charger on.
›
Once charging is complete: Switch off the charger and remove the mains ca-
ble from the power socket.
›
Only then disconnect the charger's terminal clamps.
›
Reconnect the cables to the battery (first “positive”, then “negative”).
Charging with low voltages
It is not necessary to disconnect the cables from the battery if you recharge
the vehicle battery, for example from a mini-charger.
Refer to the charger manufacturer's instructions .
A charging current of 0.1 multiple of the total vehicle battery capacity (or low-
er) must be used until full charging is achieved.
The vent plugs of the vehicle battery should not be opened for charging.
158General Maintenance
WARNING■When you charge a battery, hydrogen is released, and a highly explosive
gas mixture is also produced. An explosion can be caused through sparkling
over during unclamping or loosening of the cable plug while the ignition is
on.■
Creating a bridge between the poles on the battery (e.g. with metal ob-
jects - cables) creates a short circuit - risk of damage to the battery, explo-
sion and burning of the battery, jets of acid spurting out.
■
Avoid creating sparks when working with cables and electrical devices.
Strong sparking represents a risk of injury.
■
Before carrying out any work on the electrical system, switch off the en-
gine, the ignition and all electrical consumers and disconnect the negative
terminal
.
■
“Quick-charging” the vehicle battery is dangerous and requires a special
charger and specialist knowledge.
■
We therefore recommend that vehicle batteries be “rapidly charged” by a
specialist garage.
CAUTION
On vehicles with the START/STOP system or additional heating (auxiliary heat-
ing), the pole terminal of the charger must not be connected directly to the
negative terminal of the vehicle battery, but only to the engine earth
» page 174 .
Replacing
Read and observe
and on page 157 first.
The new vehicle battery must have the same capacity, voltage, current and thesame size as the original battery. Suitable vehicle battery types can be pur-
chased from a specialist garage.
We recommend you have the battery replaced by a specialist garage.
Disconnecting or reconnecting
Read and observe
and on page 157 first.
Disconnecting
›
Switch off the ignition.
›
First, disconnect the negative terminal
first, then the positive
terminal
of the battery.
Connecting›First, connect the positive first, then the negative battery terminal.
After disconnecting and re-connecting the vehicle battery, the following func-
tions or devices are partially or completely inoperative.Function / deviceOperating measureElectric windows» page 59Time settings» page 31
CAUTION
■ Disconnect the vehicle battery only with the ignition turned off - there is a
risk of damaging the electrical system of the vehicle.■
Under no circumstances must the battery cables be connected incorrectly –
risk of a cable fire.
Note
■ After disconnecting and re-connecting the vehicle battery, we recommend
having the vehicle checked by a specialist to ensure that the full functionality
of all electrical systems is guaranteed.■
The data of the multi-function display will be reset.
Automatic load deactivation
Read and observe
and on page 157 first.
The vehicle voltage system automatically prevents the battery from discharg-ing when the battery is put under high levels of strain. This may be noticed
from the following.
▶ The idling speed is raised to allow the generator to deliver more electricity to
the electrical system.
▶ Where appropriate large convenience consumers, e.g. seat heaters, rear win-
dow heaters, have their power limited or shut off completely if necessary.
CAUTION
■ Despite such intervention by the vehicle electric system management, the
vehicle battery may be drained. For example, when the ignition is switched on
a long time with the engine turned off or the side or parking lights are turned
on during longer parking.■
Consumers which are supplied via a 12 V socket can cause the vehicle battery
to discharge when the ignition is switched off.
159Inspecting and replenishing
If the tyre pressure is 1.3 bar or less› Do not continue to drive! You cannot properly seal the tyre using the
breakdown kit.
If the tyre pressure is 1.3 bar or more›
Correct the tyre pressure back to the correct value.
›
Continue driving carefully to the nearest specialist garage at a maximum
speed of 80 km/h (50 mph).
WARNING■ A tyre filled with sealant has the same driving characteristics as a stand-
ard tyre.■
Do not drive faster than 80 km/h (50 mph).
■
Avoid accelerating at full throttle, sharp braking and fast cornering.
Jump-starting
Introduction
This chapter contains information on the following subjects:
Jump-starting using the battery from another vehicle
174
The battery of another vehicle can be used to jump-start your vehicle if the en-
gine will not start because the battery is flat.
WARNING■ Pay attention to the warning instructions relating to working in the en-
gine compartment » page 149.■
A discharged vehicle battery can freeze at temperatures just below 0 °C.
If the battery is frozen, do not jump start with the battery of another vehi-
cle – risk of explosion.
■
Keep any sources of ignition (naked flame, smouldering cigarettes, etc.)
away from the battery – risk of explosion!
■
Never jump-start vehicle batteries with an electrolyte level that is too low
– risk of explosion and caustic burns.
■
The vent screws of the battery cells must be tightened firmly.
Note
We recommend you buy jump-start cables from a car battery specialist.Jump-starting using the battery from another vehicleFig. 187
Jump-starting: A – flat battery, B
– battery providing current
Fig. 188
Engine earth: START-STOP sys-
tem
Read and observe on page 174 first.
The starting process using the battery of another vehicle requires the use of
jumper cables.
The jump-start cables must be attached in the following sequence.
›
Attach clamp
1
to the positive terminal of the discharged battery
A
» Fig. 187 .
›
Attach clamp
2
to the positive terminal of the battery supplying power
B
.
›
Attach clamp
3
to the negative terminal of the battery supplying power
B
.
›
Attach the clamp
4
to a solid metal component firmly connected to the en-
gine block or to the engine block itself.
The jump-start cable must only be connected to the engine earthing point on
vehicles with the START-STOP system » Fig. 188.
Starting engine
›
Start the engine on the vehicle providing the power and allow it to idle.
›
Start the engine of the vehicle with the discharged battery.
174Do-it-yourself
Heating95
Control elements95
Exterior mirrors68
Seats71
HHC116
Hill Start Assist (HHC)116
Hitch127
Drawback load127
Hooks85
Horn26
I
i-Pad holder Handling
82
Ice scrapers142
Ignition lock101
Immobilizer100
Individual settings Locking
52
Unlocking52
Inertia reel13
Information system39
Compass point display45
Door warning39
Gear recommendation39
MAXI DOT display42
Multifunction display40
operation40
Service interval display46
Information system operation40
Infotainment4
Instrument cluster27
Auto-check control39
Counter for distance driven30
Display29
Fuel gauge30
Overview28
Revolution counter28
Temperature gauge29
Warning lights31
Interior care144
Natural leather145
interior light Front
64
Interior monitor55
iPad holder behind the headrests
82
ISOFIX22
J
Jack
167
Maintenance143
Jacking points Raise vehicle
170
Jump-starting174
K
KESSY Locking
51
Unlocking51
Key Locking
50
Start the engine101
Stopping the engine101
Switch off the ignition101
Switch on the ignition101
Unlocking50
L
Lamp failure Warning light
37
Lamps Warning light
37
Leather Natural leather care
145
LEAVING HOME63
Lever Main beam61
Turn signal61
Levers Windscreen wipers
67
Light Cockpit
64
COMING HOME / LEAVING HOME63
Front fog lights62
Headlights with CORNER function62
Rear fog light62
Replacing bulbs184
Lighting Luggage compartment
83
Lights59
Automatic driving lamp control61
Daylight running60
Hazard warning light system63
Headlight flasher61
Headlight range adjustment60
Low beam60
Main beam61
parking lights60
Parking lights63
Switching on and off60
Turn signal61
Warning lights31
Load194
Locking Individual settings
52
KESSY51
Key50
Remote control50
Locking and unlocking the vehicle from the in- side
52
Locking the door without a locking cylinder Emergency
178
Low beam60
205Index
SeatsArmrest71
Headrests70
Heating71
Rear seat72
Seat backrests72
Seats and headrest69
Secure variable loading floor
91
see Instrument cluster see Instrument cluster
27
Selector lever Refer to Selector lever
109
Selector lever lock Indicator light
35
Service137
Service interval display46
Warning light38
setting Lower position of the variable loading floor
90
Setting Seat belt height
12
seats and headrests69
Upper position of the variable loading floor89
Settings Interior mirror
68
Setting the Clock
31
Side airbag17
SmartGate Connection by searching for a Wi-Fi network
47
introductory information47
Password/PIN code change48
Setting48
Wi-Fi Direct48
SmartLink see Infotainment
4
Snow chains165
Sockets 12 V
77
Spare wheel163
remove168
stow168
Speed control Indicator light
35
Speed control system119
Speed limiter120
Indicator light35
Operation121
Operation description121
Speed symbol see Wheels
164
Spoiler138
Stabilisation system114
Stability Control (ESC)115
Staring engine Jump-starting
174
START-STOP104
Jump-starting174
Manually deactivating/activating the system106
operation105
Warning light38
START-STOP system104
Starter button Problems with the engine start
104
Steering column lock locking102
Steering column lock unlocking102
Switching off the engine103
Switch off the ignition103
Switch on the ignition103
Starting and stopping the engine at the push of the button
102
Starting and stopping the engine using the key 100
Starting engine Jump-starting
174
Starting the engine Starter button
103
START STOP Information messages
106
Start the engineKey101
Steering column lock locking Starter button
102
Steering column lock unlocking Starter button
102
Steering lock locking Key
100
Steering lock unlocking Key
100
Steering lock (engine start using push-button) Warning light
32
Steering wheel correct posture
9
setting9
Stop see Parking
108
Stopping the engine Key
101
Storage73
compartment beneath the front seat80
storage compartment Glasses compartment
79
Storage compartment in the doors
74
in the front arm rest79
in the front centre console75
in the rear centre console82
on the dash panel75
on the front passenger side80
on the side of the front seat75
Storage compartments73
sun visors65
Sun visors66
Switching lights on and off60
Switching off the engine Starter button
103
Switch off the ignition Key
101
Starter button103
208Index