2008 MERCEDES-BENZ SL55AMG warning

219 Controls in detail
Driving systems
Warning!G
Use of Distronic can be dangerous on slip-
pery roads. Rapid changes in tire traction
can result in wheel spin and loss of control.
Distronic does not act upon adverse sight
distance conditions. Do not use Distronic
during conditions of fog, heavy rain, snow or
sleet.
Warning!G
Distronic cannot take weather conditions
into account. Switch off Distronic or do not
switch it on if:

roads are slippery or covered with snow
or ice
The wheels could lose traction while
braking or accelerating and the vehicle
could skid.

the sensor is dirty or visibility is dimin-
ished due to snow, rain or fog for exam-
ple
The distance control system functional-
ity could be impaired.
Always pay attention to surrounding traffic
conditions even while Distronic is switched
on. Otherwise, you may not be able to recog-
nize dangerous situations until it is too late.
This could cause an accident in which you
and/or others could be injured.
Warning!G
Close attention to road and traffic condi-
tions is imperative at all times, regardless of
whether or not Distronic is activated.
Use of Distronic can be dangerous on wind-
ing roads or in heavy traffic because condi-
tions do not allow safe driving at a constant
speed.
Distronic will not react to stationary objects
on the roadway (e.g. a stopped vehicle in a
traffic jam or a disabled vehicle). Distronic
will also not respond to oncoming vehicles.


220 Controls in detail
Driving systems
Distronic displays in the speedometer
dial
1Red distance warning lamp E
2Set speed
When Distronic is activated, distance
warning lamp1 and the set speed 2
appear in the speedometer dial.Switch off Distronic:

when changing from the left to the right
lane if vehicles are moving more slowly
in the left lane

when entering a turn lane or highway off
ramp

in complex driving situations, such as in
highway construction zones
In these situations, Distronic will continue to
maintain the set speed unless deactivated.
Distronic is designed and intended only to
maintain a set speed and keep a set dis-
tance from moving objects in front of your
vehicle.
Warning!G
The “Resume” function should only be oper-
ated if the driver is fully aware of the previ-
ously set speed and wishes to resume this
particular preset speed.
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
received, 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.
iThe vehicle speed displayed in the speedom-
eter can briefly vary from the speed setting for
the Distronic.


221 Controls in detail
Driving systems
If Distronic detects a vehicle directly
ahead, the Distronic indicator lamp E
in the speedometer dial comes on white.
If Distronic calculates that there is a dan-
ger of collision:

The distance warning lamp E in the
speedometer comes on red.

An intermittent warning sounds.
Immediately apply the brake to avoid a
collision.
Under no circumstances should the
driver await the intermittent warning
sound before braking. See the follow-
ing warning note.
The intermittent warning sound ceases
and the red distance warning
lampE goes out when the neces-
sary distance to the vehicle ahead is
established again.
Warning!G
An intermittent warning sounds and the
distance warning lamp (red) E in the
speedometer dial is illuminated if the
Distronic system calculates that the
distance to the vehicle ahead and your
vehicle’s current speed indicate that
Distronic will not be capable of slowing the
vehicle sufficiently to maintain the preset
following distance, which creates a danger
of a collision.
Immediately brake the vehicle to increase
the distance to the preceding vehicle. The
warning sound is intended as a final caution
that you have not interceded with your own
braking inputs to avoid a potentially danger-
ous situation. Do not wait for the operation
of the warning signal to intercede with your
own braking, as that will result in potentially
dangerous emergency braking which will
not always result in an impact being
avoided.
Tailgating increases the risk of an accident.
Warning!G
Distronic brakes your vehicle with a maxi-
mum deceleration of 6.5 ft/s2 (2 m/s2). This
corresponds to about 20% of the maximum
deceleration ability of your vehicle.
Distronic brakes the vehicle in an effort to
restore the preset distance or to maintain
the set speed.

222 Controls in detail
Driving systems
Distronic menu in the control system
Use the
DISTRONIC menu to display the
current settings for your Distronic system.
The information shown in the multifunction
display depends on whether the Distronic
system is activated (
page 223) or
deactivated (
page 225).
Press button è or ÿ repeatedly
until you see one of the following
displays in the multifunction display.Distronic deactivated
When Distronic is deactivated, you will see
the standard display in the left multifunc-
tion display.
1Preceding vehicle, if detected
2Actual distance to preceding vehicle
3Preset distance threshold to preceding
vehicle
4Your vehicle
5Symbol for activated distance warning
functionDistronic activated
When Distronic is activated, the
DTRsymbol and the set speed appear
in the left multifunction display.
1Symbol for activated Distronic
2Set speed
iFor information on the distance warning
function*, see “Distance warning function*”
(
page 229).

225 Controls in detail
Driving systems
Setting to last stored speed
(“Resume” function)
Briefly pull the cruise control lever in
direction of arrow4 (
page 223).
Distronic resumes the last stored
speed or, if no speed is stored, it will
set and store the current speed.
Remove your foot from the accelerator
pedal.Deactivating Distronic
There are several ways to deactivate the
Distronic system:
Step on the brake pedal.
or
Briefly push the cruise control lever in
direction of arrow3 (
page 223).
Distronic will be deactivated. The last set
speed will be stored into memory.
The following message appears in the mul-
tifunction display for approximately
5 seconds:
DTR Off
Warning!G
The set speed stored in memory should only
be set again if prevailing road conditions
permit. Possible acceleration or decelera-
tion differences arising from returning to the
preset speed could caused an accident
and/or serious injury to you and others.
iThe last stored set speed is deleted when
the engine is turned off.
iDistronic deactivates automatically when

you depress the parking brake pedal

the vehicle speed is below
20 mph (30 km/h) (
page 223)

the ESP® is in operation or switched off with
the ESP® switch (page 93)

you move the gear selector lever into
positionN
An acoustic warning sounds and the
message
DTR Off appears in the multifunc-
tion display for approximately 5 seconds.
Warning!G
Distronic switches off and releases the
brakes when the vehicle decelerates below
the minimum speed of 20 mph (30 km/h)
by operation of the system. At that time the
driver must apply the brakes in order to
reduce vehicle speed further or bring it to a
stop.

226 Controls in detail
Driving systems
Setting the following distance in
Distronic
You can set the specified following dis-
tance for Distronic by varying the time set-
ting between 1.0 and 2.0 seconds. Using
this time setting and the current speed of
your vehicle, Distronic calculates and sets
the required following distance to the
preceding vehicle. The set distance will
appear in the right multifunction display
(
page 222).
The distance setting thumbwheel for the
time setting is located on the lower section
of the center console.1Thumbwheel for setting following
distanceIncreasing distance
Increasing the distance setting tells
Distronic to maintain a greater following
distance to the preceding vehicle.
Turn thumbwheel1 towards ¯.
Decreasing distance
Decreasing the distance setting tells
Distronic to maintain a shorter following
distance to the preceding vehicle.
Turn thumbwheel1 towards ®.
!Moving the gear selector lever to positionN
while driving cancels the Distronic. However, the
gear selector lever should not be moved to
positionN while driving except to coast when
the vehicle is in danger of skidding (e.g. on icy
roads).
iDepressing the accelerator pedal does not
deactivate the Distronic. After brief acceleration
(e.g. for passing), the Distronic will resume the
last speed set.
Warning!G
It is up to the driver to exercise discretion to
select the appropriate setting given road
conditions, traffic, driver’s preferred driving
style and applicable laws and driving recom-
mendations for safe following distance.

227 Controls in detail
Driving systems
Driving with Distronic
This section describes a number of driving
situations where special precaution is
required on the part of the driver.
Be prepared to brake in such situations.
This will deactivate the Distronic system.The most likely cause for a malfunctioning
system is a dirty sensor (located behind
the hood grille), especially at times of snow
and ice or heavy rain. In such a case,
Distronic will switch off, and the message
DISTRONIC Currently Unavailable See
Oper. Manual
appears in the multifunction
display.
For cleaning and care of the Distronic sen-
sor, see “Cleaning the Distronic* system
sensor cover” (
page 336).
Warning!G
Distronic works to maintain the speed se-
lected by the driver unless a moving obsta-
cle proceeding directly ahead of it in the
same travel direction is detected (e.g. fol-
lowing another vehicle ahead of you at your
set distance. This means that:

Your vehicle can pass another vehicle
after you have changed lanes.

While in a sharp turn or if the preceding
vehicle is in a sharp turn, Distronic could
lose sight of the preceding vehicle. Your
vehicle could then accelerate to the pre-
viously set speed.
Distronic regulates only the distance be-
tween your vehicle and those directly ahead
of it, but does not register stationary objects
in the road, e.g.:

a stopped vehicle in a traffic jam

a disabled vehicle

an oncoming vehicle
The driver must always be alert, observe all
traffic and intercede as required by means
of steering or braking the vehicle.
Warning!G
Distronic should not be used in snowy or icy
road conditions.
iIf the message DISTRONIC Currently
Unavailable See Oper. Manual
disappears
from the multifunction display during driving, the
dirt (e.g. slush) has dissolved. Distronic is avail-
able again if you reactivate it (
page 223).

229 Controls in detail
Driving systems
Narrow vehicles
Because of their narrow profile, the vehi-
cles traveling near the outer edges of the
lane have not yet been detected by
Distronic. There will be insufficient dis-
tance to the vehicles ahead.Distance warning function*
When Distronic* is deactivated, this func-
tion will continue to warn you when recog-
nizing a stationary obstacle or a slower
vehicle moving in your vehicle’s path and
the danger of a collision exists:

The distance warning lamp E in the
speedometer comes on red.

An intermittent warning will sound if
necessary.
If these warnings are issued, you must
brake manually to maintain a safe distance
and avoid a collision with the preceding
vehicle.
When depressing the brake pedal, the
warning sound ceases. The warning sound
will also cease when the distance to the
preceding vehicle is sufficient again with-
out applying the brakes. In this case, the
distance warning lamp will also go out.
Warning!G
If the distance warning lamp (red) E in
the speedometer comes on while driving
and/or an intermittent warning sounds,
immediate attention on part of the driver is
required.
As required by the traffic situation, apply the
brakes and navigate around a possible ob-
stacle. However, do not drive by relying on
the distance warning function, as this will
result in an emergency braking application.
This will not always enable you to avoid a
collision, especially when traveling on vary-
ing road surface conditions and with varying
driver reaction.
iComplex driving situations are not always
fully recognized by the distance warning
function. This could result in wrong or missing
distance warnings.