Intelligent Technology
192
Uphill Start Assist*The uphill start assist makes it easier to start off on steep hills. The system assists a start
off by holding the brake pressure produced by the brake pedal actuation for approx. 2
seconds after releasing the brake pedal. The driver can therefore move his foot from
the brake pedal to the accelerator pedal and start off on the slope, without having to
actuate the handbrake. The brake pressure drops gradually the more you operate the
accelerator pedal. If the vehicle does not start off within 2 seconds, it starts to roll back.
The uphill start assist is active as of a 5 % slope, if the driver door is closed. It is always
active on slopes when in forward or reverse start off. When driving downhill, it is
inactive.Electromechanical power steeringThe power steering enables you to steer the vehicle with le ss physical force.
With the electromechanical power steering , the steering assist is automatically
adapted to the speed and to the steering angle.
It is still possible to fully steer the vehicle if the power steering fails or if the engine is
not running (vehicle being towed in). The only difference is that greater physical effort
is required.
If there is a fault in the power steering, the warning light
or lights up in the instru-
ment cluster page 31.
WARNING
Contact your specialist garage if the power steering is defective.
Tyre pressure monitoring system*The tyre pressure monitoring system compares with the aid of the ABS sensors the
speed and also the rolling circumference of the individual wheels. If the rolling circum-
ference of a wheel is changed, the warning light
lights up in the instrument cluster
page 34 and an audible signal sounds. The rolling circumference of the tyre can
change if:
the tyre inflation pressure is too low,
the structure of the tyre is damaged,
the vehicle is loaded on one side,
the wheels of an axle are loaded heavily (e.g. when towing a trailer or when driving
uphill or downhill),
snow chains are mounted,
the temporary spare wheel is mounted,
one wheel per axle was changed.
Basic setting of the system
After changing the tyre inflation pressures, after changing one or several wheels, the
position of a wheel on the vehicle (e.g. ex changing the wheels between the axles) or
when the warning light lights up while drivin g, a basic setting of the system must be
carried out as follows.
Inflate all tyres to the specified inflation pressure page 228.
Switch on the ignition.
Fig. 172 Button for setting the tyre
inflation pressure control value
s3fg.2.book Page 192 Friday, April 30, 2010 12:17 PM
Towing a trailer203
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
Headlights
Before starting off with a hitched trailer, also check the setting of the headlights. Alter
the setting as necessary with the aid of the headlight beam adjuster
page 65, “Head-
lamp range adjustment* ”.
Detachable ball head
The ball rod is detachable on vehicles which feature a factory-fitted towing device. It is
stowed together with separate fitting instru ctions in the spare wheel well in the luggage
compartment of the vehicle.
Further information on the towing device page 204.
Note
We recommend that you also have your vehicle inspected between service inter-
vals if you tow a trailer frequently.
The handbrake on the towing vehicle must be put on when coupling and decou-
pling the trailer.
Driving Tips
Particular caution is required when towing a trailer.– Do not, as far as possible, drive with your vehicle unladen and the trailer laden.
– Do not make full use of the legal maximum speeds. This applies in particular to downhill sections.
– Apply the brakes in good time.
– Keep a check on the coolant temperature gauge if the outside temperature is high.
Distribution of weight
The distribution of the weight is very poor if your vehicle is unladen and the trailer is
laden. Maintain a particularly low speed if you cannot avoid driving with this combina-
tion.
Driving speed
Do not drive faster than 80 km/hour for safety reasons. This also applies for countries
in which higher speeds are allowed. The fact that the driving stability of the vehicle + trailer combination reduces with
increasing speed means that the legally allowed speed should not be used when there
are unfavourable road, weather or wind cond
itions, particularly near accident black
spots.
You must always reduce your speed immediat ely as soon as you detect even just the
slightest swaying of the trailer. On no account attempt to stop the trailer from
“swaying” by accelerating.
Apply the brakes in good time! If the trailer is fitted with a trailer brake, apply the
brakes gently at first and then brake firmly. This will avoid brake jolts resulting from the
trailer wheels locking. Shift down gears in good time before negotiating a downhill
section to allow the engine to also act as a brake.
Engine overheating
Please keep a check on the coolant temperature gauge if you have to negotiate a
lengthy slope in a low gear at a high engi ne speed when the outside temperature is
very high page 16, “Coolant temperature gauge”.
If the needle of the coolant temperature gauge moves into the right-hand area or even
the red area of the scale, reduce your speed immediately. Stop and switch off the
engine if the warning light
in the instrument cluster begins flashing. Wait a few
minutes and check the level of coolant in the coolant expansion bottle page 220,
“Inspecting the coolant level”.
Please refer to the following guidelines page 32, “Coolant temperature/ Coolant
quantity ”.
The coolant temperature can be reduced by switching on the heating.
Any increase in the cooling effect of the coolant fan through shifting down a gear and
increasing the engine speed is not possible since the fan speed is independent of the
engine speed. One should also not drop a gear for this reason when towing a trailer as
long as the engine can manage th e slope without any drop in speed.
s3fg.2.book Page 203 Friday, April 30, 2010 12:17 PM
Inspecting and replenishing
218
It is normal for the engine to consume oil. The oil consumption may be as much as 0.5
l/1 000 km depending on your style of driving and the conditions under which you
operate your vehicle. The oil consumption may be slightly hi gher than this during the
first 5 000 kilometres.
One should therefore check the oil level at regular intervals, preferably every time after
the fuel tank is filled or after driving for long stretches.
We recommend maintaining the oil level within the range - but not above this, if
the engine has been operating at high load s, for example during a lengthy motorway
trip during the summer months, towing a tr ailer or negotiating a high mountain pass.
The warning light in the instrument cluster* will indicate page 31 whether the oil
level is too low. In this case, check the oil level as soon as possible. Top up with an
appropriate quantity of oil.
Caution
The oil level must on no account extend beyond the range . Danger of damaging
the catalytic converter.
Do not continue your journey if for some reason it is not possible under the
conditions prevailing to top up with oil. Switch the engine off and obtain professional
assistance from a specialist garage, otherwise it could lead to severe engine damage.Note
Engine oil specifications page 260.Replenishing engine oil– Inspecting the engine oil level page 217.
– Unscrew the cap of the engine oil filler opening.
– Pour in a suitable grade of oil in portions of 0.5 litres page 260.
– Inspect the oil level page 217, “Check engine oil level”.
– Carefully screw on the cap of the filler opening and push the dipstick in fully.
WARNING
Avoid dripping oil onto hot parts of the engine when topping up will oil - a
risk of fire!
Read and observe the warning notes page 216, “Working in the engine
compartment” before working in the engine compartment.For the sake of the environment
The oil level must on no acco unt extend beyond the range page 217. Oil will
otherwise be drawn in through the crankc ase ventilation and may pass through the
exhaust system to atmosphere. The oil ma y combust in the catalytic converter and
damage it.Changing engine oilThe engine oil must be changed at the intervals stated in the Service schedule or
according to the service interval indicator page 17.
WARNING
Only carry out the engine oil change, if you have the required professional
knowledge!
Read and observe the warning notes page 216 before working in the
engine compartment.
First of all, let the engine cool down, we ar an eye protection and gloves - risk
of caustic burns due to hot oil.Caution
You must not pour any additives into the engine oil - risk of engine damage! Damage,
which results from such product, are excluded from the warranty.
For the sake of the environment
You must on no account pour oil into the ground or into the sewage system.
AAAA
AA
s3fg.2.book Page 218 Friday, April 30, 2010 12:17 PM
Inspecting and replenishing
220
Inspecting the coolant levelThe coolant expansion bottle is located in the engine compartment on the right.
– Switch the engine off.
– Open the bonnet page 216, “Working in the engine compartment”.
– Check the level of coolant in the coolant expansion bottle fig. 184 . The coolant
level when the engine is cold must lie between the (MIN) and (MAX) mark-
ings. The level may also rise slightly ab ove the (MAX) marking when the engine
is warm.
If the coolant level in the reservoir is too lo w, this is indicated by the warning light in
the instrument cluster
page 32. We nevertheless recommend inspecting the
coolant level directly at the reservoir from time to time.
Loss of coolant
A loss of coolant is first and foremost an indication of a leak in the system. You should
not merely top up the coolant in the reservoir. It is also important to have the cooling
system inspected without delay by a specialist garage.
Losses can only occur through the pressure relief in the cap of the coolant expansion
bottle which is completely free of leaks if the coolant boils as a result of overheating
and is forced out of the cooling system.
WARNING
Read and observe the warning notes page 216, “Working in the engine
compartment” before working in the engine compartment.
Caution
One should contact a specialist garage as s oon as possible if the source of overheating
itself cannot be determined and removed, since there may be grave damage to the
engine.Replenishing the coolant– Switch the engine off.
– Allow the engine to cool down.
– Place a cloth over the cap of the coolant expansion reservoir fig. 184 and
unscrew the cap carefully by turning it to the left .
–Top up the coolant.
– Screw the cap tight until it is heard to lock.
The coolant which you use for replenishing the system, must comply with one specific
specification page 219, “Coolant”. Do not use an al ternative additive if the coolant
additive G13 is not available in exceptional cases. Just top up the system with water
and as soon as possible arrange adjustment to correct the mixing ratio of water and
coolant additive again by a specialist garage.
Only use fresh coolant for topping up the system.
Do not fill up over the “MAX” marking! Excess coolant which is heated up is forced out
of the cooling system through the pressure relief valve in the cap of the coolant
compensation bottle.
Wait until the engine has cooled down for a system which has suffered a major loss of
coolant before pouring in coolant. This is necessary to avoid engine damage.
WARNING
The cooling system is pressurized! Do not open the cap of the coolant
expansion bottle if the engine is still hot - risk of scalding!
The coolant additive and thus all of the coolant is harmful to your health.
Avoid contact with the coolant. Coolant vapours are also harmful to the health.
It is important, therefore, to always safely store any coolant additive in its orig-
inal container out of the reach of children - risk of poisoning!
Fig. 184 Engine compartment: Coolant
expansion bottle
Ab
Aa
Aa
s3fg.2.book Page 220 Friday, April 30, 2010 12:17 PM
Inspecting and replenishing221
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
If any splashes of coolant get into yo ur eyes, rinse out your eyes immedi-
ately with clear water and contact a doctor as soon as possible.
You should also consult a doctor without delay if you have inadvertently
swallowed coolant.Caution
Do not continue your journey if for some reason it is not possible under the
conditions prevailing to top up with coolant. Switch the engine off and obtain
professional assistance from a specialist garage, otherwise it could lead to severe
engine damage.
For the sake of the environment
Do not re-use coolant if it is necessary to drain the coolant in the system. It should be
collected and disposed of in compliance with environmental protection regulations.Radiator fan
The radiator fan may switch on suddenly.The radiator fan is driven by an electric motor and controlled according to the coolant
temperature.
The radiator fan may continue running for up to 10 minutes after the engine has been
switched off - even if the igni tion is also off. It may also switch on suddenly after a
certain time, if.
the coolant temperature has risen beca use of an accumulation of heat or
the warm engine compartment is heated up additionally by strong sunlight.
WARNING
You must therefore be aware when workin g in the engine compartment that the
fan may switch on suddenly - risk of injury!
Brake fluidInspecting the brake fluid levelThe brake fluid reservoir is located on the left of the engine compartment. The brake
fluid reservoir on right-hand steering models is positioned on the other side of the
engine compartment.
– Switch the engine off.
– Open the bonnet page 216, “Working in the engine compartment”.
– Inspect the brake fluid level in the reservoir fig. 185 . The level must be between
the “MIN” and “MAX” markings.
A slight drop in the fluid level results when driving due to normal wear-and-tear and
automatic adjustment of the brak e pads, and is perfectly normal.
There may be an indication of a leak in the brake system, however, if the fluid level
drops significantly within a short time or if it drops below the “MIN” marking. If the
brake fluid level is too low, this is indicated by the warning light
lighting up in the
instrument cluster page 35. In this case stop immediately and do not drive any
further! Obtain professional assistance.
WARNING
Read and observe the warning notes page 216 before working in the
engine compartment.
WARNING (continued)
Fig. 185 Engine compartment: Brake
fluid reservoir
s3fg.2.book Page 221 Friday, April 30, 2010 12:17 PM
Fuses and light bulbs
248
Fuse assignment in engine compartment - version 2
F16
Not assigned
F17
Instrument cluster, windshield wiper lever and turn signal
light lever
5
F18
Audio amplifier (sound system)
30
F19
Radio
15
F20
Phone
5
F21
Not assigned
F22
Not assigned
F23
Engine control unit
10
F24
Control unit for CAN databus
5
F25
Not assigned
F26
Not assigned
F27
Va lve for f uel d osi ng
15
F28
Engine control unit
15/25
F29
Main relay
5
F30
Control unit for auxiliary heating
20
F31
Front window wiper
30
F32
Not assigned
F33
Not assigned
F34
Not assigned
F35
Not assigned
F36
Not assigned
F37
Not assigned
F38
Radiator fan, valves
10
F39
Not assigned
F40
Not assigned
No.
Power consumer
Amperes
F41
Not assigned
F42
Not assigned
F43
Ignition
30
F44
Not assigned
F45
Not assigned
F46
Not assigned
F47
Front left main headlight, left rear light unit
30
F48
Pump for ABS
40
F49
Power supply for terminal 15 (ignition on)
50
F50
Not assigned
F51
Not assigned
F52
Power supply relay - terminal X
a)
40
F53
Accessory equipment
50
F54
Not assigned
a)In order not to drain the battery unnecessarily when starting the engine, the electrical compo-
nents of this terminal are automatically switched off.No.
Power consumer
Amperes
Fig. 208 Schematic representation of
fuse box in engine compartment -
version 2
s3fg.2.book Page 248 Friday, April 30, 2010 12:17 PM
Fuses and light bulbs249
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
Certain electrical components are only standard on certain vehicle model versions or
only suppliable as optional
equipment for certain models.
Fuse assignment in the dash panelCertain electrical components are only stan dard on certain vehicle model versions or
only suppliable as optional equipment for certain models.
No.
Power consumer
Amperes
F1
Not assigned
F2
Control unit for automatic gearbox DQ200
30
F3
Measuring circuit
5
F4
Va lve s for AB S
30/20
F5
Control unit for automatic gearbox DQ250
15
F6
Instrument cluster, windshield wiper lever and turn signal
light lever
5
F7
Power supply for terminal 15 (ignition on)
40
F8
Radio
15
F9
Phone
5
F10
Engine control unit, Main relay
5/10
F11
Control unit for auxiliary heating
20
F12
Control unit for CAN databus
5
F13
Engine control unit
15/20/30
F14
Ignition
20
F15
Lambda probe (petrol engine)
Glow plug system relay and fuel pump (diesel engine)
10
5
F16
Front right main headlight, right rear light unit
30
F17
Horn
15
F18
Audio amplifier (sound system)
30
F19
Front window wiper
30
F20
Va lve for f uel d osi ng
water pump
20
10
F21
Lambda probe
10/15/20
F22
Clutch pedal switch
5
F23
Relay
Valves
High pressure pump
5
10
15
F24
The radiator fan
10
F25
Pump for ABS
30/40
F26
Left main headlight
30
F27
Control unit for glow plug system
40/50
F28
Windscreen heater
50
F29
Accessory equipment
50
F30
Power supply relay - terminal X
a)
50
a)In order not to drain the battery unnecessarily wh en starting the engine, the electrical compo-
nents of this terminal are automatically switched off.No.
Power consumer
Amperes
Fig. 209 Schematic representation of
the fuse carrier in the dash panel
s3fg.2.book Page 249 Friday, April 30, 2010 12:17 PM
Fuses and light bulbs
250No.
Power consumer
Amperes
1
Diagnostic socket, engine control unit, fuel pump relay,
fuel pump control unit
7,5
2
Control unit for ABS, ESP, switch for tyre air pressure con-
trol, brake sensor
5
3
Switch and control unit for airbag
5
4
WIV, parking light, dimming mirrors, pressure sensor, tele-
phone preinstallation
5
5
Control unit for headlamp beam adjustment and head-
light swivel, control unit for parking aid, control unit for
park assist
5
6
Instrument cluster, control unit for electromechanical
power steering, Haldex, selector lever lock, power supply
for data bus
5
7
Valve heating, air mass meter
10
8
Control unit for trailer detection
5
9
Relay for auxiliary heating
5
10
Adaptive left main headlight
10
11
Adaptive right main headlight
10
12
Not assigned
13
Diagnostic socket, light switch, rain sensor, clock
7,5
14
Central locking system and bonnet lid
15
15
Central control unit - interior lights
7,5
16
Air conditioning system
7,5
17
Not assigned
18
Not assigned
19
Not assigned
20
KESSY
5
21
KESSY ELV
7,5
22
Air blower for Climatronic
40
23
Front power window, central locking of the front doors
30
24
Selector lever lock
5
25
Rear window heater, relay for auxiliary heating and venti-
lation
30
26
Power socket in the luggage compartment
25
27
Fuel pump relay,
Fuel pump relay, control unit for fuel pump, injection
valves
15
20
28
Electric boot lid
30
29
Preparation for the aftermarket radio
5
30
Not assigned
31
Not assigned
32
Front power window, central locking system of the rear
doors
30
33
Electric sliding/tilting roof
25
34
Alarm, spare horn
5
35
front and rear lighter
25
36
Headlight cleaning system
20
37
Front seat heating
20
38
Heated rear seats
20
39
Not assigned
40
Fan air-conditioning system, re lay for auxiliary heating and
ventilation
40
41
Rear window wiper
10
42
Light switch
5
No.
Power consumer
Amperes
s3fg.2.book Page 250 Friday, April 30, 2010 12:17 PM