2009 MERCEDES-BENZ CL COUPE brake sensor

the area around the sensors, as Park Assist
may not work properly otherwise.
Warning displays The warning displays show the distance
between the sensors and the obstacle. The
warning display for the front area is in the
instrument cluster. The warning display for
the rear area is in the roof trim at the rear. Front area warning display
1
Left-hand side of the vehicle
2 Right-hand side of the vehicle
3 Operational readiness symbols
The warning display for each side of the vehi-
cle is divided into five yellow and two red seg-
ments. Park Assist is operational when yellow
operational readiness symbols 3light up.
The automatic transmission position deter-
mines which warning display is active: Automatic
transmis-
sion position Display range
D
Front area warning display
activated
R
Front and rear areas acti-
vated
N
If electric parking brake is
engaged: none
If electric parking brake is
released: front and rear
areas are activated P
No areas activated One or more segments light up as the vehicle
approaches an obstacle, depending on the
vehicle's distance to the obstacle. When the
first red segment lights up, you hear an inter-
mittent warning for about two seconds. From
the second red segment, you hear a continu-
ous warning. You have reached the minimum
distance.
i
In heavy rain, the warning displays and
tones can be triggered by, for example,
water running past the sensors.
Collision warning Park Assist detects obstacles from some dis-
tance. If you reverse towards an obstacle you
will hear a warning tone. You must brake to
avoid a collision. The collision warning tone
does not sound if you are very close to the
obstacle. Instead, you will hear the corre-
sponding warning tone for the rear area warn-
ing indicator.
i In heavy rain, the collision warning can be
triggered by, for example, water running
past the sensors.
Deactivating and activating X
Press button 1.
Park Assist is deactivated if indicator lamp
2 is lit. Driving systems
253Controls
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Display messages
Possible causes/consequences and
X
X Solutions DISTRONIC
PLUS currently
unavaila‐
ble See
Owner's
Manual
A warning tone sounds and Distronic Plus* is deactivated and
temporarily inoperative if:
R
the Distronic Plus* cover in the radiator grille is dirty.
R the sensors in the bumpers are dirty.
R the radar sensor system is temporarily inoperative, e.g. due
to electromagnetic radiation emitted by nearby TV or radio
stations or other sources of electromagnetic radiation.
R its function is impaired due to heavy rain or snow.
R the system is outside the operating temperature range.
R the on-board voltage is insufficient.
Distronic Plus* is operational again and the display message
disappears when:
R the dirt (e.g. slush) drops away while you are driving.
R the system detects that the sensors are fully available
again.
R the system is within the operating temperature range.
If the display message continues to be shown:
X Clean the Distronic Plus* cover in the radiator grille
(Y page 310).
X Clean the bumpers (Y page 310).
X Restart the engine. DISTRONIC
PLUS inopera‐
tive
Distronic Plus* is faulty. BAS PLUS* (Brake Assist PLUS) and
PRE-SAFE
®
Brake* may be inoperative as well. A warning tone
also sounds.
X Visit a qualified specialist workshop. DISTRONIC
PLUS override
Distronic Plus* is no longer controlling the speed of the vehi-
cle.
X
Remove your foot from the accelerator pedal. Display
messages
321Practical advice
* optional
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Display messages
Possible causes/consequences and
X
X Solutions PRE-SAFE Function
currently
limited
See Own‐
er's Man‐
ual
G
Risk of accident
The PRE-SAFE ®
Brake* is temporarily inoperative if:
R the Distronic Plus* cover in the radiator grille is dirty.
R the sensors in the bumpers are dirty.
R its function is impaired due to heavy rain or snow.
R the radar sensor system is temporarily inoperative, e.g. due
to electromagnetic radiation emitted by nearby TV or radio
stations or other sources of electromagnetic radiation.
R the system is outside the operating temperature range.
R the on-board voltage is insufficient.
The PRE-SAFE ®
Brake* is operational again and the display
message disappears when:
R the dirt (e.g. slush) drops away while you are driving.
R the system detects that the sensors are fully available
again.
R the system is within the operating temperature range.
If the display message continues to be shown:
X Clean the Distronic Plus* cover in the radiator grille
(Y page 310).
X Clean the bumpers (Y page 310).
X Restart the engine.
X Wait until the battery is charged sufficiently. PRE-SAFE Function
limited
See Own‐
er's Man‐
ual
G
Risk of accident
PRE-SAFE ®
Brake* is defective.
BAS PLUS* or the distance warning signal may also have
failed.
X Visit a qualified specialist workshop. Radar sen‐
sor deactiva‐
ted See
Owner's
Manual
G
Risk of accident
Vehicles with Distronic* or Distronic Plus*: the radar sensor
system is deactivated.
X Check whether the radar sensor system may be activated
(Y page 411).
X Switch on the radar sensor system (Y page 226).326
Display
messagesPractical advice
* optional
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Display messages
Possible causes/consequences and
X
X Solutions Radar sen‐
sor deactiva‐
ted
autom.
See Own‐
er's Man‐
ual
Vehicles with a navigation system*: the vehicle is close to a
radio-telescope facility and, therefore, must not transmit any
radar signals. The radar sensor system has switched off auto-
matically.
The following functions are unavailable:
R Distronic Plus* (Y page 235)
R BAS PLUS* (Y page 49)
R Parking Guidance* (Y page 254)
R PRE-SAFE ®
Brake* (Y page 52)
R Blind Spot Assist* (Y page 260)
X Drive on.
These functions are available again as soon as the vehicle
is far enough away from the radio telescope facility
(Y page 411). Run Flat
Indicator Check
tyre pres‐
sures
then
restart Vehicles with tyre pressure loss warning system: a tyre pres-
sure loss warning message has been displayed.
X
Set the correct tyre pressure for all tyres (Y page 298).
X Restart the tyre pressure loss warning system
(Y page 299). Run Flat
Indicator inopera‐
tive Vehicles with tyre pressure loss warning system: the tyre
pressure loss warning system is faulty.
X
Visit a qualified specialist workshop. Tyre pres‐
sure Check
tyres
G
Risk of accident
Vehicles with a tyre pressure loss warning system: the tyre
pressure loss warning system has detected a significant pres-
sure loss. A warning tone also sounds.
X Stop the vehicle without making any sudden steering or
braking manoeuvres. Pay attention to traffic conditions as
you do so.
X Check the tyres.
X Correct the tyre pressure. If necessary, set the correct tyre
pressure ( Ypage 298).
X If necessary, repair any defective tyres or change the wheel
(Y page 373).
X Restart the tyre pressure loss warning system once the tyre
pressure is correct (Y page 299). Display
messages
327Practical advice
* optional
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24-GHz radar sensor system* (coun-
try overview)
The 24 GHz radar sensor system requires
separate approval for each country. When
you are driving in a country in which the radar
sensor system is not approved, you must
deactivate the system using the on-board
computer (Y page 226). The current country
overview can be obtained from a Mercedes-
Benz Service Centre.
Vehicles with COMAND and navigation
system*: the radar sensor system is deacti-
vated automatically near radio telescope
facilities. If Distronic Plus*, Park Assist*, Parking Guidance*, Blind Spot Assist* or
PRE-SAFE
®
Brake* are activated at this point,
a corresponding warning will appear in the
multi-function display to tell you that the
radar sensor system is being switched off.
BAS PLUS* is also no longer available. If the
deactivation does not occur automatically,
you must deactivate the radar sensor system
using the on-board computer (Y page 226).
Vehicles without COMAND and naviga-
tion system* and vehicles for Australia:
deactivate the radar sensor system in the on-
board computer when you are near a radio
telescope facility (Y page 226). Country Radio telescope
facilities Geographic coordinates
(latitude/longitude) Distance to be
maintained from the facility Egypt – – –
Andorra – – –
Australia Parkes 32°59'59"S, 148°15'44" E 10 km
Narrabri 30°18'52"S, 149°32'56" E 10 km
Canberra 35°23'54"S, 148°58'40" E 3 km
Western Australia 26°37'13"S, 117°30'40" E 10 km
Bahrain – – –
Belgium – – –
Bosnia-Herzego-
vina – – –
Bulgaria – – –
Denmark – – –
Germany Effelsberg 50°31'32"N, 06°53'00" E 6.5 km
Estonia – – –
Finland Metsähovi 60°13'04" N, 24°23'37" E 7 km
Tuorla 60°24'56" N, 22°26'31" E 5 km24-GHz radar sensor system* (country overview)
411Technical data
* optional
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