START-STOP
Introduction
This chapter contains information on the following subjects:
Starting/shutting down the engine
116
Operating conditions for the system
116
Manually activating/deactivating the system
117
Information messages
117
The START-STOP system helps you to save fuel while at the same time reducing
harmful exhaust emissions and CO 2 emissions.
The function is automatically activated each time the ignition is switched on.
In the start-stop mode, the engine automatically switches to the vehicle's idle phase, e.g. when stopped at traffic lights. The engine restarts automatically
where necessary.
The system can work only if the following basic conditions are met. The driver's door is closed.
The driver has fastened the seat belt. The bonnet is closed.The driving speed exceeded 4 km/h after the last stop.
No trailer is coupled.
WARNING■ The brake servo unit and power steering only operate if the engine is run-
ning.■
Never let the vehicle roll with the engine switched off.
CAUTION
Always deactivate the START-STOP system before driving through wa-
ter » page 109 .Note■
If the driver's seat belt is removed for more than 30 seconds or the driver's door
is opened during stop mode, the engine will have to be started manually.■
After manually starting the engine, automatic engine shut down is not possible
until the vehicle has travelled the required minimum distance for START-STOP mode.
■
Changes to the outdoor temperature can have an effect on the internal temper-
ature of the vehicle battery even after several hours. If the vehicle remains out-
doors for a long time in minus temperatures or in direct sunlight, it can take sev-
eral hours until the internal temperature of the vehicle battery reaches a suitable
temperature for proper operation of the START STOP system.
■
If Climatronic is running in automatic mode, the engine may not switch off auto-
matically under certain conditions.
Starting/shutting down the engine
First read and observe the introductory information and safety warn-ings
on page 116.
›
Stop the vehicle (where necessary, apply the handbrake).
›
Shift the gear lever to Neutral.
›
Release the clutch pedal.
Automatic engine shut down (STOP phase) runs. The
warning symbol appears
in the instrument cluster display.
›
Depress the clutch pedal.
The automatic start procedure takes place again (START phase). The
warning
symbol goes out.
Operating conditions for the system
First read and observe the introductory information and safety warn-
ings
on page 116.
The START-STOP system is very complex. Some of the procedures are hard to check without servicing.
No engine shut down runs
Before each STOP phase, the system checks whether certain conditions have
been met. No engine shut down runs in the following situations.
116Driving
›The engine has not yet reached the minimum temperature for the START STOP
mode.
› The temperature inside the vehicle has not reached the desired temperature
set in the air-conditioning system/heating.
› The external temperature is very low/high.
› Intensive windscreen deicing (Climatronic) or windscreen deicing/ventilation is
switched on at the maximum air temperature setting (manual air conditioning
system).
› The parking aid is activated.
› The charge state of the vehicle battery is too low.
› The stationary vehicle is on a steep hill or a steep slope.
› The idling speed is too high.
› The steering angle is too great (manoeuvring).
The
warning symbol appears in the instrument cluster display.
The automatic start procedure runs again During the STOP phase, the engine fires up without any active driver intervention,
e.g. in the following situations.
› The vehicle has begun to roll, e.g. on a slope.
› The difference between the temperature setting of the air-conditioning sys-
tem/heating and the temperature of the interior is too great.
› Intensive windscreen deicing (Climatronic) or windscreen deicing/ventilation is
switched on at the maximum air temperature setting (manual air conditioning
system).
› The brake pedal was pressed several times (the pressure in the braking system
is too low).
› The charge state of the vehicle battery is too low.
› The current consumption is too high.
Manually activating/deactivating the system
Fig. 99
Button for the START-STOP sys-
tem
First read and observe the introductory information and safety warn-
ings on page 116.
Activation/deactivation
›
Press the button » Fig. 99 .
When start-stop mode is deactivated, the warning light in the button lights up.
Note
If the system is deactivated during the STOP phase, the automatic start proce-
dure runs.
Information messages
First read and observe the introductory information and safety warn-
ings
on page 116.
The messages and information are shown in the instrument cluster display.
Start the engine manually.START MANUALLY
The driver sees this message when the conditions for the automatic start proce- dure are not met during the STOP phase. The engine must be started manually.
Fault: start-stop system
ERROR START-STOP
Fault in the START-STOP system. Seek help from a specialist garage.
117Assist systems
The distribution of the weight is very poor if your vehicle is unladen and the trail-
er is laden. Maintain a particularly low speed if you cannot avoid driving with this
combination.
Tyre pressure
Correct the tyre inflation pressure on your vehicle for a “full load” » page 174,
Tyre service life .
Trailer load
The permissible trailer load must not be exceeded under any circumstan- ces » page 201 , Technical data .
The trailer loads specified apply only to altitudes up to 1 000 metres above mean
sea level.
The engine output falls as altitude increases, as does the ability to climb. There-
fore, for every additional 1000 m in height (or part), the maximum permissible
towed weight must be reduced by 10 %.
The towed weight comprises the actual weights of the (loaded) towing vehicleand the (loaded) trailer.
The trailer and drawbar load information on the type plate of the towing equip- ment are merely test data for the towing equipment. The vehicle-specific values
are detailed in the vehicle documents.WARNING■ Do not exceed the maximum permissible axle and drawbar load and the
maximum permissible total or towed weight of the vehicle and the trailer –
there is the risk of an accident and serious injury.■
Slipping loads can significantly affect the stability and safety of the vehicle/
trailer combination – there is the risk of an accident and serious injury.
Towing a trailer
First read and observe the introductory information and safety warn-
ings
on page 121.
Exterior mirrors
You have to have additional exterior mirrors fitted if you are not able to see the
traffic behind the trailer with the standard rear-view mirrors. National legal re-
quirements must be observed.
Headlights
The front of the vehicle can be lifted when a trailer is being towed and the head-
lights can dazzle other road users.
Adjust the headlight setting on the headlight range control » page 44, Headlight
beam adjustment .
Driving speed
For safety reasons, do not drive faster than 80 km/h when towing a trailer.
Immediately reduce your speed as soon as even the slightest swaying of the trail- er is detected. Never attempt to stop the trailer from “swaying” by accelerating.
Brakes
Apply the brakes in good time! If the trailer is fitted with a trailer brake, apply the
brakes gently at first, then brake firmly. This will avoid brake jolts resulting from
the trailer wheels locking.
On downhill sections shift down a gear in good time to also use the engine as a
brake.
Engine overheating
The speed must be reduced immediately if the needle for the coolant tempera- ture gauge moves into the right-hand area or the red area of the scale.
Stop and switch off the engine if the warning light
in the instrument cluster
starts to flash. Wait a few minutes and check the level of coolant » page 167,
Checking the coolant level .
The following guidelines must be observed » page 22,
Coolant .
The coolant temperature can be reduced by switching on the heating.WARNING■ Adapt your speed to the conditions of the road surface and to the traffic sit-
uation.■
Improper or incorrectly connected electric cables can energise the trailer and
cause functional faults to the vehicle's entire electrical system as well as acci-
dents and severe injuries.
■
Work on the electrical system must only be carried out by specialist garages.
■
Never directly connect the trailer's electrical system with the electrical con-
nections for the tail lights or other current sources.
122Driving
WARNINGPlease read the following advice before beginning work in the engine com-
partment.■
Turn off the engine and withdraw the ignition key.
■
Firmly apply the handbrake.
■
If the vehicle is fitted with a manual gearbox, move the gearshift lever into
Neutral, or if the vehicle is fitted with an automatic gearbox, move the selec-
tor lever into position P.
■
Allow the engine to cool.
■
Never open the bonnet if you can see steam or coolant flowing out of the
engine compartment – there is a risk of scalding. Wait until the steam or cool- ant has stopped escaping.
WARNINGPlease read the following advice for work in the engine compartment.■Keep children clear of the engine compartment.■
Never touch the radiator fan while the engine is still warm. The fan might
suddenly start running!
■
Do not touch any hot engine parts – there is a risk of burns.
■
The coolant additive and thus all of the coolant is harmful to your health.
■
Avoid contact with the coolant.
■
Coolant vapours are harmful to health.
■
Never open the end cover of the coolant expansion reservoir while the en-
gine is still warm. The cooling system is pressurized!
■
When opening the end cover of the coolant expansion reservoir, cover it
with a cloth to protect your face, hands and arms from hot steam or hot cool-
ant.
■
If any coolant splashes into your eyes, immediately rinse out your eyes with
clear water and contact a doctor as soon as possible.
■
Always safely store the coolant additive in its original container out of the
reach of children – there is a risk of poisoning.
■
Consult a doctor immediately if coolant is swallowed.
■
Do not leave any items (e.g. cleaning cloths or tools) in the engine compart-
ment.
■
Never spill fluids on the hot engine. Such fluids (e.g. the antifreeze con-
tained in the coolant) may ignite!
WARNINGThe following warning instructions must be observed at all times when work-
ing in the engine compartment while the engine is running.■
Pay particular attention to moving engine parts (e.g. V-ribbed belt, alterna-
tor, radiator fan) and the high-voltage ignition unit – there is a risk of death.
■
Never touch the electric wiring on the ignition system.
■
Avoid short circuits in the electrical system - particularly on the vehicle's
battery.
■
Always make sure that no jewellery, loose clothing or long hair can get
caught in rotating engine parts – there is a risk of death. Always remove any jewellery, tie back long hair and wear tight fitting clothing before completing
any work.
WARNINGThe following warning instructions must be observed if work has to be carried
out on the fuel or electrical systems.■
Always disconnect the vehicle battery from the electrical system.
■
Do not smoke.
■
Never work near open flames.
■
Always have a functioning fire extinguisher nearby.
WARNING■ Read the information and warning instructions on the fluid containers.■Keep fluids in their original containers and keep out of reach of children!■
If you wish to work under the vehicle, you must secure the vehicle against
rolling away and support it with suitable axle stands: the car jack is not suffi-
cient for this – there is a risk of injury.
■
Never cover the engine with additional insulation material (e.g. with a blan-
ket) – there is a risk of fire.
■
The bonnet must always be properly closed when driving. This is why after
closing the bonnet, the lock must always be checked to ensure it has engaged properly.
■
If you notice that the lock is not properly engaged while driving, stop the ve-
hicle immediately and close the bonnet – there is the risk of an accident.
161Inspecting and replenishing
Checking the electrolyte levelFig. 131
Vehicle battery: Electrolyte level
indicator
First read and observe the introductory information and safety warn-
ings on page 169.
We recommend you have the electrolyte level checked by a specialist garage from time to time, especially in the following cases.
› High outside temperatures.
› Long daily drives
› After each charge
» page 171.
On vehicles with a vehicle battery fitted with a colour indicator, known as the
magic eye » Fig. 131, the electrolyte level can be determined by looking at the
change in colour.
Air bubbles can influence the colour of the indicator. For this reason carefully
knock on the indicator before carrying out the check.
› Black colour - electrolyte level is correct.
› Colourless or light yellow colour - electrolyte level too low, the battery must be
replaced.
Note
■ The battery electrolyte level is also periodically checked by a specialist garage
as part of the Inspection Service.■
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 battery control unit for
checking the energy level for the recurring engine start.
Operation in winter
First read and observe the introductory information and safety warn-
ings
on page 169.
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, re-
charged by a specialist garage before the start of the winter.
Charging
First read and observe the introductory information and safety warn-ings
on page 169.
A properly charged vehicle battery is essential for reliably starting the engine.
›
Switch off the ignition and all of the electrical components.
›
Only when performing a “quick-charge”, disconnect both battery cables (first
“negative”, then “positive”).
›
Attach the terminal clamps of the charger to the battery terminals (red = “posi-
tive”, black = “negative”).
›
Plug the mains cable of the charger into the power socket and switch thecharger on.
›
Once charging is complete: Switch off the charger and remove the mains cable
from the power socket.
›
Only then disconnect the charger's terminal clamps.
›
Reconnect the cables to the battery (first “positive”, then “negative”).
It is not necessary to disconnect the battery cables if you are recharging the vehi-
cle battery using low amperages (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 lower)
must be used until full charging is achieved.
Both cables must be disconnected before charging the battery with high amper-
ages, known as “ rapid charging”.
The vent plugs of the vehicle battery should not be opened for charging.
171Inspecting and replenishing
WARNING“Quick-charging” the vehicle battery is dangerous and requires a special
charger and specialist knowledge.
CAUTION
On vehicles with the START/STOP system, 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 189, Jump-starting in vehicles with the START-STOP
system .
Note
We therefore recommend that vehicle batteries be rapid charged by a specialist
garage.
Disconnecting or reconnecting
First read and observe the introductory information and safety warn-ings
on page 169.
The following functions are initially deactivated or are no longer able to operate
faultlessly after the vehicle battery has been disconnected and reconnected.
OperationOperating measureElectrical power window (operational faults)» page 40Enter the radio/navigation system code num-
ber» User manual of the radio
or » user manual of the naviga-
tion systemSetting the clock» page 12Data in the multifunction display are deleted.» page 13
Note
We recommend having the vehicle checked by a specialist garage to ensure the
full functionality of all electrical systems.
Replacing
First read and observe the introductory information and safety warn-
ings
on page 169.
When replacing a battery, the new vehicle battery must have the same capacity,
voltage, amperage and be the same size. Suitable vehicle batteries can be pur-
chased from a specialist dealer.
We recommend that the battery is replaced by a specialist garage, where the new
vehicle battery will be installed properly and the original battery will be disposed
of in accordance with national regulations.
Automatic load deactivation
First read and observe the introductory information and safety warn-ings
on page 169.
The vehicle voltage control unit automatically prevents the battery from discharg-
ing when the battery is subjected to heavy loads. 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 vehi-
cle 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.
Note
Driving comfort is not disrupted by any shutting off of consumers. Often the driv-
er is not aware of it having taken place.
172General Maintenance
›Remove the empty tyre inflator bottle from the valve.›Screw the valve core back into the tyre valve using the valve remover 1.
Inflating›
Screw the air compressor tyre inflation hose
5
» Fig. 145 on page 186 firmly on-
to the tyre valve.
›
Check that the air release valve
7
is closed.
›
Start the engine and run it in idle.
›
Plug the connector
9
into 12 Volt socket » page 70, 12-volt power outlet .
›
Switch on the air compressor with the ON and OFF switch
8
.
›
Allow the air compressor to run until a pressure of 2.0 - 2.5 bar is achieved. Max-
imum run time of 8 minutes » !
›
Switch off the air compressor.
›
If you cannot reach an air pressure of 2.0 – 2.5 bar, unscrew the tyre inflation
hose
5
from the tyre valve.
›
Drive the vehicle 10 metres forwards or backwards to allow the sealing agent to
“distribute” in the tyre.
›
Firmly screw the tyre inflation hose
5
back onto the tyre valve and repeat the
inflation process.
›
If you cannot reach the required tyre inflation pressure here either, this means
the tyre has sustained too much damage. You cannot seal with tyre with the breakdown kit »
.
›
Switch off the air compressor.
›
Remove the tyre inflation hose
5
from the tyre valve.
Once a tyre pressure of 2.0 – 2.5 bar is reached, the journey may be continued at a maximum speed of 80 km/h (50 mph).
Check the tyre inflation pressure after driving for 10 minutes » page 187.
WARNING■
The tyre inflation hose and air compressor may get hot as the tyre is being
inflated – there is a risk of injury.■
Do not place the hot tyre inflation hose or hot air compressor on flammable
materials – there is a risk of fire.
■
If you cannot inflate the tyre to at least 2.0 bar, this means the damage sus-
tained was too serious. The sealing agent cannot be used to seal the tyre.
Do not drive the vehicle. Seek help from a specialist garage.
CAUTIONSwitch off the air compressor after running 8 minutes at the latest – there is a
risk of overheating. Allow the air compressor to cool a few minutes before switch- ing it on again.
Check after 10 minutes' driving
First read and observe the introductory information and safety warn-ings
on page 185.
Check the tyre inflation pressure after driving for 10 minutes!
If the tyre pressure is 1.3 bar or less
›
Do not drive the vehicle. You cannot properly seal with tyre with the break-
down kit.
If the tyre pressure is 1.3 bar or more
›
Adjust the tyre pressure to the correct value again (see inside of fuel filler cap).
›
Continue driving carefully to the nearest specialist garage at a maximum speed
of 80 km/h (50 mph).
Jump-starting
Introduction
This chapter contains information on the following subjects:
Jump-starting using the battery from another vehicle
188
Jump-starting in vehicles with the START-STOP system
189WARNING■ A discharged vehicle battery may already freeze at temperatures just below
0 °C. If the battery is frozen, do not jump start with the battery of another ve- hicle – there is a risk of explosion.■
Pay attention to the warning instructions relating to working in the engine
compartment » page 160, Engine compartment .
187Emergency equipment, and self-help
Jump-starting in vehicles with the START-STOP systemFig. 147
Engine compartment: Earth
First read and observe the introductory information and safety warn-ings on page 187.
The jump-start cable must only be connected to the engine earthing point on ve-
hicles with the START-STOP system » Fig. 147.
Towing the vehicle
Introduction
This chapter contains information on the following subjects:
Front towing eye
190
Rear towing eye
190
Vehicles with a tow hitch
190
Vehicles with manual transmission may be towed in with a tow bar or a tow rope
or with the front or rear wheels raised.
Vehicles with automatic transmission may be towed in with a tow bar or a tow
rope or with the front wheels raised. If the vehicle is raised at rear, the automatic
gearbox is damaged!
A tow bar is the safest way of towing a vehicle and also minimises any shocks.
Only use a tow rope if a suitable tow bar is not available.
The following guidelines must be observed when towing.
Driver of the tow vehicle›Release the clutch particularly gently when starting off or depress the accelera-
tor particularly gently if the vehicle is fitted with an automatic gearbox.›
On vehicles with a manual transmission, only push down on the accelerator pedal once the rope is taught.
The maximum towing speed is 50 km/h.
Driver of the towed vehicle
›
Switch on the ignition so that the steering wheel is not locked and so that the turn signal lights, horn, windscreen wipers and windscreen washer system can
be used.
›
Take the vehicle out of gear or move the selector lever into position N if the ve-
hicle is fitted with an automatic gearbox.
Please note that the brake servo unit and power steering only operate if the en-
gine is running. If the engine is not running, significantly more physical force is re-
quired to depress the brake pedal and steer the vehicle.
If using a tow rope, ensure that it is always kept taught.
CAUTION
■ Do not tow start the engine – there is a risk of damaging the engine and the
catalytic converter. The battery from another vehicle can be used as a jump-start
aid » page 187 , Jump-starting .■
If the gearbox no longer contains any oil because of a defect, your vehicle must
only be towed with the driven wheels raised clear of the ground or on a special
breakdown vehicle or trailer.
■
The vehicle must be transported on a special breakdown vehicle or trailer if it is
not possible to tow in the vehicle in the way described or if the towing distance is
greater than 50 km.
■
To protect both vehicles when tow-starting or towing, the tow rope should be
elastic. Thus one should only use plastic fibre rope or a rope made out of a simi-
larly elastic material.
■
While towing, take care to avoid impermissibly high tensile forces or jerky loads.
There is always a risk of excessive stresses and damage resulting at the points to
which you attach the tow rope or tow bar when you attempt to tow a vehicle
which is not standing on a paved road.
■
Attach the tow rope or the tow bar to the towing eyes » page 190 , Front tow-
ing eye or » page 190 , Rear towing eye to the detachable ball head of the tow-
ing equipment » page 118 .
189Emergency equipment, and self-help