MERCEDES-BENZ S550 4MATIC 2008 W221 Owner's Manual

440 Controls in detail
Driving systems
Obstacles and stationary vehicles
DISTRONIC Plus does not brake for obsta-
cles or stationary vehicles. If, for example,
the vehicle detected in front of you chang-
es lanes to bypass an obstacle or station-
ary vehicle in front of it, DISTRONIC Plus
will not brake for the obstacle or stationary
vehicle.Cross-traffic
DISTRONIC Plus may inadvertently detect
crossing vehicles. If you switch on DIS-
TRONIC Plus, for example, at a traffic light
with cross-traffic, the vehicle may sudden-
ly start to drive off.Airmatic (S 550 only)
Airmatic automatically selects the opti-
mum suspension tuning and ride height for
your vehicle.
Airmatic consists of two components:

Level control system

Adaptive Damping System (ADS)
The ADS automatically selects the opti-
mum damping for the respective driv-
ing conditions. At the same time the
suspension is set to either sporty or
comfort.

441 Controls in detail
Driving systems
Vehicle level control with Airmatic
Your vehicle automatically adjusts its ride
height to:

increase vehicle safety

reduce fuel consumption
The vehicle chassis ride height is raised or
lowered according to the selected level
setting and to the vehicle speed:

With increasing speed, ride height is re-
duced by up to approximately 0.8 in
(20 mm).

With decreasing speed, the ride height
is again raised to the selected vehicle
level.The following vehicle level settings can be
selected when the vehicle is stationary:
Select the “Raised” level setting only when
required by current driving conditions.
Otherwise:

Fuel consumption may increase.

Handling may be impaired.1Vehicle level control switch
2Indicator lamp
Start the engine.
Briefly press switch1 to change from
one level setting to the other.
The message:
“Vehicle rising”
appears in the multifunction display
when changing from normal level to
raised level.
The indicator lamp2 is then lit. The
display switches off when the vehicle is
raised.
Warning!G
To help avoid personal injury, keep hands
and feet away from wheel housing area, and
stay away from under the vehicle when low-
ering the vehicle chassis.
iThese height adjustments are so small that
you may not notice any change.
Level
NormalFor driving on normal roads.
The indicator lamp is off.
RaisedFor driving on rough roads or
with snow chains. The indica-
tor lamp is on.


442 Controls in detail
Driving systems
Press switch1 again to lower the ve-
hicle. The indicator lamp2 is off.Suspension tuning
The Adaptive Damping System (ADS) auto-
matically tunes shock absorbers and
springs.
The suspension tuning is set according to:

your driving style

road surface conditions

the vehicle loading

your choice of suspension style
The program mode selector switch (C/S)
(
page 409) is used to adjust the suspen-
sion tuning:
Start the engine.
Select the desired driving program.
Active Body Control (ABC)*
The ABC system is an active, comput-
er-controlled system that hydraulically ad-
justs the suspension at all four wheels in
response to various driving situations. It
automatically selects the optimum suspen-
sion tuning and ride height for your vehicle.
iThe selected vehicle level setting remains
stored in memory even if the engine is turned off
and restarted except when you

exceed a speed of 75 mph (120 km/h)
or

maintain a speed of between 50 mph
(80 km/h) and 75 mph (120 km/h) for more
than 3 minutes
The vehicle then lowers to regular level.
Driving programSuspension tuning
CComfortcomfortable
(default setting)
SSportsporty
for dynamic driving
Warning!G
S63AMG and S65AMG only:
When you switch off the engine, the entire
vehicle is lowered. You should therefore
make sure that no one is near the wheel
housing or under the vehicle when you
switch off the engine. Otherwise, parts of
the individuals body could be trapped.
!S63AMG and S65AMG only:
When you switch off the engine, the entire vehi-
cle is lowered. When parking, position your vehi-
cle in such a way that it will not scrape against a
curb, for example, when it is lowered. Your vehi-
cle could otherwise be damaged.


443 Controls in detail
Driving systems
Vehicle level control with ABC
Your vehicle automatically adjusts its ride
height to:

increase vehicle safety

reduce fuel consumption
The vehicle chassis ride height is raised or
lowered according to the selected level
setting and to the vehicle speed:

With increasing speed, ride height is re-
duced by up to approximately 0.6 in
(15 mm).

With decreasing speed, the ride height
is again raised to the selected vehicle
level.
The following vehicle level settings can be
selected when the vehicle is stationary:
Select the “Raised” level setting only when
required by current driving conditions.
Otherwise:

Fuel consumption may increase.

Handling may be impaired.1Vehicle level control switch
2Indicator lamp
Selecting a higher level
Start the engine.
If indicator lamp2 is off:
Press switch1.
Indicator lamp2 comes on. The vehi-
cle is raised to a higher level.
iS63AMG and S65AMG only:
When you switch off the engine, the entire vehi-
cle is lowered by 0.2 in (5 mm).
Warning!G
To help avoid personal injury, keep hands
and feet away from wheel housing area, and
stay away from under the vehicle when low-
ering the vehicle chassis.
iThese height adjustments are so small that
you may not notice any change.
Level
NormalFor driving on normal roads.
The indicator lamp is off.
RaisedFor driving on rough roads or
with snow chains. The indica-
tor lamp is on.
iThe selected vehicle level setting remains
stored in memory even if the engine is turned off
and restarted.

444 Controls in detail
Driving systems
Selecting a normal level
Start the engine.
If indicator lamp2 is on:
Press switch1.
Indicator lamp2 goes out. The vehicle
is adjusted to a normal level.
Suspension tuning
The suspension tuning is set according to:

your driving style

road surface conditions

the vehicle loading

your choice of suspension styleThe program mode selector switch (C/S)
(
page 409) or (S/C/M) (page 413) is
used to adjust the suspension tuning:
Start the engine.
Select the desired driving program.
Parktronic system*
Driving programSuspension tuning
CComfortcomfortable
(default setting)
SSport
MManualsporty
for dynamic driving
Warning!G
Parktronic is a supplemental system. It is
not intended to, nor does it replace, the
need for extreme care. The responsibility
during parking and other critical maneuvers
always remains with the driver.
Warning!G
Make sure no persons or animals are in the
area in which you are maneuvering. You
could otherwise injure them.
!Special attention must be paid to objects
with smooth surfaces or low silhouettes (e.g.
trailer couplings, painted posts, elevated cross-
bars or road curbs). Such objects may not be de-
tected by the system and can damage the
vehicle.

445 Controls in detail
Driving systems
The Parktronic system is an electronic
parking aid with ultrasonic sensors that
helps you while parking.
It visually and audibly indicates the relative
distance between the vehicle and an ob-
stacle.
The Parktronic system is automatically ac-
tivated when you switch on the ignition, re-
lease the electronic parking brake or start
the engine and engage gear D, R or N.The Parktronic system deactivates at
speeds over approximately 11 mph
(18 km/h). At lower speeds the Parktronic
system turns on again.
The Parktronic system also deactivates
when you set the automatic transmission
to P or secure the vehicle in place with the
electronic parking brake and switch off the
engine.
The Parktronic system monitors the sur-
roundings of your vehicle with six sensors
in the front bumper and four sensors in the
rear bumper.
1Sensors in the front bumper (Only visi-
ble without DISTRONIC Plus*)Range of the sensors
!The operational function of the Parktronic
system can be affected by dirty sensors, espe-
cially at times of snow and ice.
Make sure that the area on the bumpers around
the sensors is free of dirt, ice and/or slush,
otherwise Parktronic may not function properly,
see “Cleaning the Parktronic* system sensors”
(
page 589).
iInterference caused by other ultrasonic sig-
nals (e.g. working jackhammers, car wash, or the
air brakes of trucks) can cause the system to
send erratic indications, and should be taken
into consideration.
iTo function properly, the sensors must be
free of dirt, ice, snow and slush. Clean the sen-
sors regularly, being careful not to scratch or
damage the sensors, see “Cleaning the Park-
tronic* system sensors” (
page 589).

446 Controls in detail
Driving systems
Front sensors
Rear sensorsMinimum distance
If the system detects an obstacle in this
range, all the distance warning segments
illuminate and you hear a warning signal. If
the obstacle is closer than the minimum
distance, the actual distance may no long-
er be indicated by the system.Warning indicators
Visual signals indicate to the driver the rel-
ative distance between the sensors and an
obstacle.
The warning indicator for the front area is
in the instrument cluster. The warning indi-
cator for the rear area is on the roof liner in
the rear.
1Left side of the vehicle
2Right side of the vehicle
3Indicator
Each warning indicator is divided into five
yellow and two red distance segments for
either side of the vehicle.
If yellow indicators 3 under the segments
are lit, Parktronic is ready to measure.
Centerapprox. 40 in (100 cm)
Cornersapprox. 24 in (60 cm)
Centerapprox. 48 in (120 cm)
Cornersapprox. 32 in (80 cm)
!During parking maneuvers, pay special at-
tention to objects located above or below the
height of the sensors (e.g. street curbs, painted
posts, or trailer hitches etc.). The Parktronic sys-
tem will not detect such objects at close range
and damage to your vehicle or the object may re-
sult.
Ultrasonic signals from outside sources (e.g.
truck air brakes, car wash, or jackhammers) may
impair the operation of the Parktronic system.
Centerapprox. 8 in (20 cm)
Cornersapprox. 6 in (15 cm)

447 Controls in detail
Driving systems
The position of the gear selector lever de-
termines which warning indicators will be
activated.
As your vehicle approaches an object, one
or more distance segments will illuminate,
depending on the distance. When the sev-
enth distance segment illuminates, you
have reached the minimum distance.
Front area:
An intermittent acoustic warning will
sound as the first red distance segment
illuminates and a constant acoustic
warning lasting a maximum of
2 seconds will sound for the second
red distance segment. The signal is
canceled when the gear selector lever
is placed in park position P.

Rear area:
An intermittent acoustic warning will
sound as the first red distance segment
illuminates and a constant acoustic
warning lasting a maximum of
2 seconds will sound for the second
red distance segment. The signal is
canceled when the gear selector lever
is placed in position D orP.Switching Parktronic system on/off
The Parktronic system can be switched off
manually.
1Parktronic button
2Indicator lamp
Gear selector
lever positionWarning indicator
DFront area activated
R or NFront and rear area
activated
PNeither activated

448 Controls in detail
Driving systems
Switching off the Parktronic sys-
tem: Press button 1.
Indicator lamp 2 comes on.
Switching on the Parktronic system:
Press button 1 again.
Indicator lamp 2 goes out.
Parktronic system malfunction
If only the red distance segments illumi-
nate and an acoustic warning sounds,
there is a malfunction in the Parktronic
system. The Parktronic system will auto-
matically switch off after 20 seconds and
the indicator lamp in the Parktronic switch
comes on.
Have the Parktronic system checked
by an authorized Mercedes-Benz Cen-
ter as soon as possible.
If only the red distance segments illumi-
nate and no acoustic warning sounds, the
Parktronic system sensors are dirty or
there is an interference from other radio or
ultrasonic signals. The Parktronic system
will automatically switch off after 20 sec-
onds and the indicator lamp in the Park-
tronic switch comes on.
Switch off the ignition (page 344).
Clean the Parktronic system sensors
(
page 589).
Switch on the ignition.
or
Check the Parktronic system operation
at another location to rule out interfer-
ence from outside radio or ultrasonic
signals.
Park Assist*
iThe Parktronic system is automatically
switched on when the ignition is switched on
(
page 344).
Warning!G
Park Assist is a supplemental system. It is
not intended to, nor does it replace, the
need for extreme care. The responsibility
during parking and other critical maneuvers
always remains with the driver.
Warning!G
Make sure no persons or animals are in the
area in which you are maneuvering. You
could otherwise injure them.
!Special attention must be paid to objects
with smooth surfaces or low silhouettes (e.g.
trailer couplings, painted posts, elevated cross-
bars or road curbs). Such objects may not be de-
tected by the system and can damage the
vehicle.

449 Controls in detail
Driving systems
Park Assist is an electronic parking aid
with radar sensors that helps you while
parking.When travelling in Canada in a vehicle not
registered in Canada, you must switch off
the radar sensor system* (
page 282).
Canadian law does not permit the use of
the radar sensor system* (
page 282) for
vehicles from outside of Canada. When you
switch off the radar sensor system*, the
following functions are deactivated:

BAS Plus* (page 69)

DISTRONIC Plus* (page 424)

Park Assist

PRE-SAFE® Brake* (page 76)
It visually and audibly indicates the relative
distance between the vehicle and an ob-
stacle.
Park Assist is automatically activated
when the engine is running and the trans-
mission is in position D, R or N.
The Park Assist system deactivates at
speeds over approximately 11 mph. At
lower speeds the Parktronic system turns
on again.
iUSA only:
This device has been approved by the FCC as a
“Vehicular Radar System”. The radar sensor is
intended for use in an automotive radar system
only. Removal, tampering, or altering of the de-
vice will void any warranties, and is not permitted
by the FCC. Do not tamper with, alter, or use in
any non-approved way.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
iCanada only:
This device complies with RSS-210 of Industry
Canada. Operation is subject to the following
two conditions:
(1) This device may not cause interference, and
(2) this device must accept any interference re-
ceived, including interference that may
cause undesired operation of the device.
Removal, tampering, or altering of the device will
void any warranties, and is not permitted. Do not
tamper with, alter, or use in any non-approved
way.
Any unauthorized modification to this device
could void the user’s authority to operate the
equipment.
!The operational function of the Park Assist
system can be affected by dirty sensors, espe-
cially at times of snow and ice.
Make sure that the area on the bumpers around
the sensors is free of dirt, ice and/or slush,
otherwise Park Assist may not function properly,
see “Cleaning the Park Assist* system sensors
(USA only)” (
page 590).
!High-frequency sources such as toll sta-
tions, speed measuring systems, etc. can cause
the Park Assist system to malfunction. You can
switch off the Park Assist using the Park Assist
button (
page 452) or switch off the radar sen-
sors (
page 282) to prevent possible malfunc-
tion.