Intelligent Technology
194
•
when driving with snow chains
•
when driving in deep snow or on a loose surface
•
when it is necessary to rock a ca
r free when it has become stuck.
then you should switch on the ESP again.
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 surface and the traffic situation.
This particularly applies when driving on slippery and wet roads. The increased safety offered must not tempt you to take greater risks than other- wise - risk of an accident!
Note
•
All four wheels must be fitted with the same tyres in order to achieve problem-
free operation of the ESP. Differing rolling
circumferences of the tyres can lead to an
undesirable reduction in the engine output.•
Changes to vehicle (e.g. on engine, on the brakes, on chassis or other assign-
ment of tyres and wheels) can influence the function of the ESP
⇒page 241,
“Accessories, changes and replacement of parts”.Electronic Differential Lock (EDL)* The electronic differential lock pr
events an individual wheel from
slipping.Models fitted with ESP are 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 conditio
ns of the road surface are unfavourable.
Operating principle The EDL is activated automatically, 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 greater driving force to the other driven wheel. This control proces
s is also accompanied by noises.
Overheating of the brakes The EDL switches off
automatically 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 driv
en 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
•
Depress the accelerator carefully when accelerating on uniformly slip-
pery road surfaces, such as ice and sn
ow. The 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 car inspected as s
oon as possible by a specialist garage.
•
Changes to vehicle (e.g. on engine, on
the brakes, on chassis or other assign-
ment of tyres and wheels) can in
fluence the function of the EDL
⇒page 241,
“Accessories, changes and
replacement of parts”.
s2dk.1.book Page 194 Wednesday, April 8, 2009 12:23 PM
Intelligent Technology
195
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
Traction control system (TCS) The traction control system prevents
the driven wheels from spinning
when accelerating.General The TCS makes it much easier, and sometimes at all possible, to start off, accelerate and climb a steep hill when the conditio
ns 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 automatically adapted by redu
cing the engine speed. Th
is occurs at all speeds.
The TCS operates in combination with the ABS
⇒page 197. The TCS will not func-
tion if a fault exists in the ABS system. The TCS warning light lights up in the instrument cluster when there is a fault on the TCS
⇒page 38.
Switching off You can switch the TCS off and on again
as you wish by pressing the button
⇒ fig. 191
. The TCS warning light lights up in the instrument cluster when the TCS is
switched off
⇒page 38.
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 car free 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 undesirable reduction in the engine output.•
Changes to vehicle (e.g. on engine, on the brakes, on chassis or other assign-
ment of tyres and wheels) can in
fluence the function of the TCS
⇒page 241,
“Accessories, changes and replacement of parts”.Active driver-steering recommendation (DSR)*Vehicles with ESP are equi
pped with active driver-steering recommendation (DSR).
This function indicates to the driver in critical situations a steering recommendation in order to stabilise the vehicle. The active driver-steering recommendation is acti- vated, for example, on the right and left
vehicle side when
braking sharply on
different road surfaces.
Fig. 191 TCS switch
s2dk.1.book Page 195 Wednesday, April 8, 2009 12:23 PM
Intelligent Technology
199
Using the system
Safety
Driving Tips
General Maintenance
Breakdown assistance
Technical Data
Tyre inflation pressu
re-control system*
The tyre inflation pressure-control system compares with the aid of the ABS sensors the speed and also the rolling circumference
of the individual wheels. If the rolling
circumference of a wheel is changed, the warning light°
lights up in the instru-
ment cluster
⇒page 39. 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 tyre inflation pressure-control system After changing the tyre inflation pressures or after changing one or several wheels, a basic setting of the system must be carried out as follows.•
Inflate all tyres to the specified inflation pressure
⇒page 235.
•
Switch on the ignition.
•
Press button
⇒fig. 192
for more than 2 seconds. While pressing the
button, the warning light
lights up. At the same time the memory of the system
is erased and the new calibration is star
ted, which is confirmed with an audible
signal and then the warning light
goes out.
•
If the warning light
does not go out after the basic setting, there is a fault in
the system. Have the vehicle inspected by your nearest specialist garage. Warning light
lights up
If the tyre inflation pressure of at least on
e wheel is insufficiently inflated in compar-
ison to the stored basic value, the warning light
⇒
lights up.
Warning light
flashes
If the warning light flashes, there is a system fault. Have the vehicle inspected by your nearest specialist garage.
WARNING
•
When the warning light
lights up, immediately reduce the speed and
avoid sudden steering and brake mano
euvres. Please stop the vehicle
without delay at the nearest possible stop and inspect the tyres and their inflation pressures.•
The driver is responsible for the correc
t tyre inflation pressures. For this
reason, the tyre inflation pressures must be checked regularly.•
Under certain circumstances (e.g. sporty style of driving, wintry or
unpaved roads) the warning light
can be delayed or does not light up at
all.•
The tyre inflation pressure-control system does not take away the
responsability from the driver for the correct tyre inflation pressure.
Note
The tyre inflation pressure-control system:•
does not replace the regular tyre inflatio
n pressure control, because the system
cannot detect an even pressure loss,•
cannot warn in case of very rapid tyre inflation pressure loss, e.g. in case of
sudden tyre damage. In this
case carefully bring the vehi
cle to a standstill without
sudden steering movements and without sharp braking.
Fig. 192 Button for setting the tyre inflation pressure control value
s2dk.1.book Page 199 Wednesday, April 8, 2009 12:23 PM
Fuses and light bulbs
260
Fuse assignment in the dash panelCertain electrical components are only st
andard on certain vehicle model versions
or only suppliable as optional
equipment for certain models.
No.
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 control, brake sensor
5
3
Switch and control unit for airbag
5
4
WIV, parking light, dimming mirrors, pressure sensor, telephone 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 sup- ply for data bus
5
Fig. 232 Schematic repre- sentation of the fuse carrier in the dash panel
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
Central locking of the front doors
10
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
Central locking system of the rear doors
10
18
Not assigned
19
Not assigned
20
Not assigned
21
Not assigned
22
Air blower for Climatronic
40
23
Front power window
30
24
Selector lever lock
5
25
Rear wind
ow heater
relay for auxiliary heating and ventilation
2530
26
Power socket in the luggage compartment
25
27
Fuel pump relay, Fuel pump relay, control unit for fuel pump, injection valves
1520
28
Not assigned
29
Preparation for the aftermarket radio
5
No.
Power consumer
Amperes
s2dk.1.book Page 260 Wednesday, April 8, 2009 12:23 PM