Instruments and warning lights25
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
– Investigate the function indicated.
– Obtain professional assistance.
Meaning of the red symbols:
Three
successive warning signals will sound if a red symbol appears.
Yellow symbols
A yellow symbol signals a warning.Check the relevant function as soon as possible.
The meaning of the yellow symbols:
One warning signal will sound if a yellow symbol appears.
If several operational faults of priority 2 exist, the symbols appear one after the other
and are each illuminated for about 5 seconds.SetupYou can change certain setti ngs by means of the information display. The current
setting is shown on the information display in the respective menu at the top below the
line.
You can select the following information (d epending on the equipment installed on
the vehicle):
Language
Autom. blind
MFD Data
Convenience
Lights & Vision
Time
Winter tyres
Units
Assistants
Alt. speed dis.
Service Interval (Service)
Factory Setting
Back
After selecting the menu point Back you will reach one level higher in the menu.
Language
Here you can set in which language the warning and information texts should be
displayed.
Automatic blind* (Combi)
Here you can deactivate/activate the automatic roll-up function of the luggage
compartment roll cover when opening the boot lid.
Displays of the MFA
Here you can switch off or on certain displays of the multi-functional indicator.
Comfort*
You can set the following f unctions (depending on the equipment installed on the
vehicle):
Engine oil pressure too low
page 31
Overheated clutches of the automatic gear-
box DSG*
page 36
Check engine oil level,
engine oil sensor faulty
page 31
Brake pad worn
page 35
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Starting-off and Driving
126
It is necessary to eliminate the possible ca use which prevents the unlocking and repeat
the attempt to unlock the steering.
Engine protection for electric steering lock
The electric steering lock has an engine protection which slows down the locking and
unlocking of the steering if the starter button is pressed repeatedly at short intervals.
Note
After pressing the starter button while th e steering is locked, the steering is
unlocked, the electrical components are acti vated (e.g. radio, navigation system etc.)
and the igntion is switched on.
If you do not exit or enter the vehicle again using the valid key after locking the
steering, however you wish to unlock the st eering, you must press the starter button.
At the same time, electrical components ar e activated (e.g. radio, navigation system
etc.) and the ignition is switched on.
If you switch off the ignition or the engine by pressing the starter button and if the
driver door is already opened, the steering wi ll not lock. In order to lock the steering, it
is necessary to close and open the driver door again or to lock the vehicle with the aid
of the sensor page 40, fig. 26 .
Switching on the ignitionIt is necessary that a valid key is in the vehicle and that the steering is unlocked in order
to switch on the ignition.
– The ignition is switched on by briefly pressing the starter button page 125,
fig. 129 .
Once you switch on the ignition an d open the driver door, the message Switch off
ignition! appears in the information display*.Switching off the ignition– The ignition is switched off by briefly pressing the starter button page 125,
fig. 129 .
The ignition can be switched off up to a speed of 2 km/h. On vehicles fitted with a manual gearbox,
the clutch must not be pressed after
switching off the ignition otherwise the system would try to start.
On vehicles fitted with an automatic gearbox, the selector lever must be in the position
P or N and the brake pedal must not be pressed.
Emergency ignition shutoff systemIn an emergency it is possible to switch off the ignition even at speeds greater than 2
km/h, by way of the so-called em ergency ignition shutoff system.
– Press the starter button page 125, fig. 129 for longer than 1 second or press it
twice within 1 second.
WARNING
Never switch off the ignition while dr iving, otherwise the steering and brake
assist do no longer function - risk of accident!Starting the engineIt is necessary that a valid key is in the vehi cle, the steering is unlocked and the ignition
is switched on in order to start the vehicle. On vehicles with manual gearbox, hold the
clutch pressed when starting the vehicle, on vehicles with automatic gearbox move the
selector lever into position P or N and hold the brake pedal pressed until the engine
starts.Petrol engines– Press the starter button page 125, fig. 129 until the engine has started.Diesel engines– If the starter button is pressed during the whole preglow period, the engine starts
after the warning light
has gone out.
The diesel engine can also be started by pressing the starter button, the ignition is
switched on and the preglow warning light
lights up. You must wait until the
preglow warning light
goes out and then press the starter button again until the
engine starts.
A1
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Intelligent Technology187
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
Driving TipsIntelligent TechnologyElectronic stability programme (ESP)*GeneralGeneral
The ESP aids you in maintaining control of your vehicle in situations in which the
vehicle is driving at its dynamic limits, such as entering a curve fast. The risk of skidding
is reduced and your vehicle thus offers greater driving stability depending on the
conditions of the road surface. The system operates at all speeds.
The following systems are integrated into the electronic stability programme:
Electronic Differential Lock (EDL),
Traction control system (TCS),
active driver-steering recommendation (DSR),
Antilock brake system (ABS),
Brake Assist,
Uphill Start Assist.
The ESP system cannot be switched off, only the TCS system can be switched off by
pressing the button fig. 170 , the warning light
lights up. Operating principle
The ESP switches on automatically when the engine is started and then conducts a
self-test. The ESP control unit processes data from the individual systems. It also proc-
esses additional measurement data which are supplied by highly sensitive sensors: the
rotational velocity of the vehicle about its ve
rtical axis, the lateral acceleration of the
vehicle, the braking pressure and the steering angle.
The direction which the driver wishes to take is determined based on the steering
angle and the speed of the vehicle and is co nstantly compared with the actual behav-
iour of the vehicle. If differences exist, such as the vehi cle beginning to skid, the ESP will
automatically brake the appropriate wheel.
The car is stabilised again by the forces wh ich take effect when the wheel is braked.
Intervention into the brake system takes place primarily on the outer front wheel of a
vehicle which tends to oversteer (tendency for the rear of the vehicle to break away)
while occurs this is on the inner rear wh eel of a vehicle which tends to understeer
(tendency to shift out of the curve). This braking control cycle is accompanied by
noises.
During an intervention of the system, the warning light
flashes in the instrument
cluster page 33.
The ESP operates in combination with the ABS page 191. If there is a fault in the ABS
system, the ESP also does not operate.
The ESP warning light lights up in the instrument cluster when there is a fault on the
ESP
page 33.WARNING
It is also not possible for the ESP to overcome the physical limits of the vehicle.
Even if a vehicle fitted with ESP you should still always adapt your style of
driving to the condition of the road surfac e and the traffic situation. This partic-
ularly applies when driving on slippery and wet roads. The increased safety
Fig. 170 ESP switch
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Intelligent Technology
188
offered must not tempt you to take greater risks than otherwise - risk of an acci-
dent!
Note
All four wheels must be fitted with the same tyres in order to achieve problem-free
operation of the ESP. Differing rolling circum ferences of the tyres can lead to an unde-
sirable reduction in the engine output.
Changes to vehicle (e.g. on engine, on th e brakes, on chassis or another combina-
tion of tyres and wheels) can influence the function of the ESP page 234, “Accesso-
ries, changes and replacement of parts”.
Electronic Differential Lock (EDL)*
The electronic differential lock prev ents an individual wheel from slip-
ping.Models fitted with ESP ar e equipped with electronic differential lock (EDL).
General
The EDL makes it much easier, and sometimes at all possible, to start off, accelerate
and climb a steep hill when the conditions of the road surface are unfavourable.
Operating principle
The EDL is activated automaticall y, that is without any action on the part of the driver.
It monitors the speeds of the driven wheels with the aid of the ABS sensors. Should
only one drive wheel begin spinning on a slippery surface there will be an appreciable
difference in the speed of the driven wheels. The EDL function brakes the slipping
wheel and the differential transmits a greate r driving force to the other driven wheel.
This control process is also accompanied by noises.
Overheating of the brakes
The EDL switches off automatica lly if unusually severe stresses exist in order to avoid
excessive heat generation in the disc brake on the wheel which is being braked. The
vehicle can continue to be driven and has the same characteristics as a vehicle not
fitted with EDL. The EDL switches on again automatically
as soon as the brake has cooled down.
WARNING
Carefully depress the accelerator when accelerating on uniformly slippery
road surfaces, such as ice and snow. Th e driven wheels might still spin despite
the EDL and affect the stability of the vehicle - risk of an accident!
You should always adapt your style of driving to the condition of road
surface and to the traffic situation even when your vehicle is fitted with EDL.
The increased safety offered must not tempt you to take greater risks than
otherwise - risk of an accident!Note
If the ABS or ESP warning light comes on, this may also indicate a fault in the EDL.
Please have the vehicle inspected as soon as possible by a specialist garage.
Changes to vehicle (e.g. on engine, on the brakes, on chassis or another combina-
tion of tyres and wheels) can influence the function of the EDL page 234, “Accesso-
ries, changes and replacement of parts”.
Traction control system (TCS)
The traction control system prevents the driven wheels from spinning
when accelerating.
WARNING (continued)
Fig. 171 TCS switch
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Intelligent Technology189
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
General
The TCS makes it much easier, and sometimes at
all possible, to start off, accelerate and
climb a steep hill when th e conditions of the road surface are unfavourable.
Operating principle
The TCS switches on automatically when th e engine is started and then conducts a
self-test. The system monitors the speeds of the driven wheels with the aid of the ABS
sensors. If the wheels are spinning, the force transmitted to the road surface is auto-
matically adapted by reducing the engine speed. The system operates at all speeds.
The TCS operates in combination with the ABS page 191. The TCS will not function
if a fault exists in the ABS system.
The TCS warning light lights up in the instru ment cluster when there is a fault on the
TCS
page 33.
During an intervention of the system, the TCS warning light
flashes in the instru-
ment cluster page 33.
Switching off
You can switch the TCS off and on again as you wish by pressing the button
page 188, fig. 171 . The TCS warning light lights up in the instrument cluster when
the system is switched off
page 33.
The TCS should normally always be switched on. It may be good practice in certain
exceptional cases, such as when you wish to have wheel slip, to switch off the system.
Examples:
when driving with snow chains,
when driving in deep snow or on a loose surface,
when it is necessary to rock a vehicle when it has become stuck.
then you should switch on the TCS again.
WARNING
You should always adjust your style of driving to the conditions of the road
surface and the traffic situation. The increased safety offered must not tempt
you to take greater risks than otherwise - risk of an accident!
Note
All four wheels must be fitted with the same tyres in order to achieve problem-free
operation of the TCS. Differing rolling circumferences of the tyres can lead to an unde-
sirable reduction in the engine output.
Changes to vehicle (e.g. on engine, on the brakes, on chassis or another combina-
tion of tyres and wheels) can influence the function of the TCS page 234, “Accesso-
ries, changes and replacement of parts”.
Active driver-steering recommendation (DSR)*Vehicles with ESP and ABS ar e equipped with active driver-steering recommendation
(DSR).
This function indicates to the driver in crit ical situations a steering recommendation in
order to stabilise the vehicle. The active driver-steering recommendation is activated,
for example, on the right and left vehicle si de when braking sharply on different road
surfaces.
WARNING
Even with this additional function the vehicle cannot steer itself! The driver is
furthermore responsible for the steering of the vehicle!BrakesWhat has a negative effect on braking efficiency?Wear-and-tear
Wear-and-tear to the brake pa ds is greatly dependent on the operating conditions of
the vehicle and your style of driving. Particularly if you drive a great deal in towns and
over short distances or if you adopt a sporty style of driving, it may be necessary to
have the thickness of the brake pads insp ected at a specialist garage between the
service inspections.
Wet roads or road salt
There may be a certain delay before the brakes take full effect un der certain conditions
such as when driving through water, during heavy rain showers or after the vehicle has
s3fg.2.book Page 189 Friday, April 30, 2010 12:17 PM
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
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