engine MERCEDES-BENZ CL COUPE 2009 Manual Online
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Page 327 of 421

Display messages
Possible causes/consequences and
X
X Solutions Park
Assist currently
unavaila‐
ble See
Owner's
Manual
Park Assist* is temporarily deactivated if:
R
the radar sensor system is inoperative, e.g. because of
electromagnetic radiation near television and radio trans-
mitters.
R the sensors in the bumpers are dirty.
R the on-board voltage is insufficient.
Park Assist* is operational again and the display message
disappears when:
R the dirt drops away while you are driving.
R the system detects that the sensors are fully available
again.
If the display message continues to be shown:
X Clean the bumpers (Y page 310).
X Restart the engine.
X Wait until the battery is charged sufficiently. Park
Assist inopera‐
tive
Park Assist* is faulty.
X
Visit a qualified specialist workshop. Parking
Guidance 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. Parking Guidance* has switched itself off auto-
matically.
X
Drive on.
Parking Guidance* is available again as soon as the vehicle
is far enough away from the radio-astronomical installation
(Y page 411). Parking
Guidance inopera‐
tive
Parking Guidance* is faulty.
X
Visit a qualified specialist workshop. 324
Display
messagesPractical advice
* optional
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Page 328 of 421

Display messages
Possible causes/consequences and
X
X Solutions Parking
Guidance currently
unavaila‐
ble See
Owner's
Manual
Parking Guidance* is temporarily deactivated if:
R
the radar sensor system is inoperative, e.g. because of
electromagnetic radiation near television and radio trans-
mitters.
R the sensors in the bumpers are dirty.
R the on-board voltage is insufficient.
Parking Guidance* is operational again and the display mes-
sage disappears when:
R the dirt drops away while you are driving.
R the system detects that the sensors are fully available
again.
If the display message continues to be shown:
X Clean the bumpers (Y page 310).
X Restart the engine.
X Wait until the battery is charged sufficiently. Parking
Guidance cancelled
Parking Guidance* has been deactivated because the vehicle
is skidding.
X
Reactivate Parking Guidance* later. Parking Guidance* has been deactivated because the sensors
in the bumper are dirty or because it is malfunctioning. The
parking space symbol does not appear in the multi-function
display at speeds below 16 km/h.
X Clean the bumpers (Y page 310).
X Restart the engine.
or
X Visit a qualified specialist workshop. Parking
Guidance finished The vehicle is parked. A warning tone also sounds.
The display message disappears automatically.
PRE-SAFE inopera‐
tive See
Owner's
Manual
G
Risk of injury
PRE-SAFE ®
has malfunctioned. All other occupant safety sys-
tems, e.g. airbags, remain available.
X Visit a qualified specialist workshop. Display
messages
325Practical advice
* optional
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Page 329 of 421

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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Page 332 of 421

Display messages
Possible causes/consequences and
X
X Solutions Wheel sen‐
sor(s) missing
Vehicles with tyre pressure monitor*: the tyre pressure sen-
sor signal for one or more of the tyres is missing. The pressure
of the affected tyre is not displayed in the instrument cluster.
X
Have the faulty tyre pressure sensor replaced at a qualified
specialist workshop. Cruise
control inopera‐
tive Cruise control is faulty.
X
Visit a qualified specialist workshop. Cruise
control
and SPEED‐
TRONIC inopera‐
tive Speedtronic and cruise control are faulty. A warning tone also
sounds.
X
Visit a qualified specialist workshop. Blind
Spot
Assist inopera‐
tive
Blind Spot Assist* is faulty.
X
Visit a qualified specialist workshop. Blind
Spot
Assist currently
unavaila‐
ble See
Owner's
Manual
Blind Spot Assist* is temporarily inoperative if:
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 outside the operating tempera-
ture range.
R the radar sensor system has switched off automatically, for
example in the vicinity of a radio telescope facility.
Blind Spot Assist* is operational again and the display mes-
sage 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 radar sensor system is back within the operating tem-
perature range.
If the display message continues to be shown:
X Clean the bumpers (Y page 310).
X Restart the engine. Display
messages
329Practical advice
* optional
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Page 333 of 421

Display messages
Possible causes/consequences and
X
X Solutions Cruise
control
- - - km/h A condition for activating cruise control has not been met.
X
Activate ESP ®
(Y page 51)
X If conditions permit, drive faster than 30 km/h and store
the speed (Y page 227). The system has overheated.
X
Wait until the system has cooled down. Apply
brake to
shift out of posi‐
tion P
X
Depress the brake pedal. To start
the
engine, shift to
either P
or N You attempted to start the engine while transmission position
R
or Dwas selected.
X Shift the transmission to Por N. Symbol messages
G
Risk of accident and injury
The operating safety of your vehicle may be affected if service work is carried out incorrectly.
You could lose control of your vehicle and cause an accident. In addition, the safety systems may
no longer be able to protect you or others as they are designed to do.
Always have service work performed at a qualified specialist workshop which has the necessary
specialist knowledge and tools to carry out the work required. Mercedes-Benz recommends that
you use a Mercedes-Benz Service Centre for this purpose. In particular, work relevant to safety
or on safety-related systems must be carried out at a qualified specialist workshop. Display messages
Possible causes/consequences and
X
X Solutions L G
Risk of accident
The bonnet is open.
X Stop immediately, paying attention to road and traffic con-
ditions.
X Close the bonnet. N The boot lid is open
X
Close the boot lid. C At least one door is open and you are driving at more than
6 km/h.
X
Close the doors. 330
Display
messagesPractical advice
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Page 334 of 421

Display messages
Possible causes/consequences and
X
X Solutions # The alternator or vehicle's electrical system is faulty.
The battery is not being charged.
X
Pull over and stop the vehicle safely, paying attention to
road and traffic conditions and leave the engine running.
X Open the bonnet.
X Check whether the poly-V-belt is torn.
If the poly-V-belt is torn:
! Do not continue driving. The engine could otherwise over-
heat.
X Switch off the engine.
X Consult a qualified specialist workshop.
If the poly-V-belt is intact:
X Visit a qualified specialist workshop. ? The engine fan is faulty.
X
Make sure that the coolant temperature does not exceed
120 †.
X Avoid subjecting the engine to heavy loads (e.g. driving in
mountainous terrain) and stop-and-go driving.
X Drive to the nearest qualified specialist workshop. J ABS and
ESP inop‐
erative
See Own‐
er's Man‐
ual
G
Risk of accident
ABS (Anti-lock Braking System), ESP ®
(Electronic Stability
Program), BAS (Brake Assist), PRE-SAFE ®
, HOLD, hill start
assist, the adaptive brake lights and ESP ®
trailer stabilisation
are unavailable due to a malfunction. In addition, the ÷,
å and! warning lamps light up in the instrument clus-
ter. The brake system continues to function normally, but
without the functions listed above.
BAS PLUS* (Brake Assist PLUS) and PRE-SAFE ®
Brake *may
be inoperative as well.
X Drive on carefully.
X Visit a qualified specialist workshop. Display messages
331Practical advice
* optional
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Page 339 of 421

Display messages
Possible causes/consequences and
X
X Solutions !
The indicator lamp (red) flashes.
The power supply for the electric parking brake was interrup-
ted.
X Pull the electric parking brake handle.
or
X Pull away carefully (Y page 205).
or
X Pull the electric parking brake lever until the display mes-
sage disappears. !
The indicator lamp (red) flashes, the warning lamp (yel-
low) lights up and a warning tone sounds.
The electric parking brake is malfunctioning.
X Switch off the ignition and turn it back on.
X Engage or release the electric parking brake.
or
X Pull away carefully (Y page 205).
X Visit a qualified specialist workshop. !
The warning lamp (yellow) lights up. In addition, the
indicator lamp (red) flashes for about 10 seconds after the
electric parking brake has been engaged or released. It then
goes out or remains lit.
The electric parking brake is malfunctioning, e.g. because of
over- or undervoltage.
X Pull away carefully (Y page 205).
X Visit a qualified specialist workshop.
In case of over- or undervoltage:
X Remove the cause for the over- or undervoltage, e.g. by
charging the battery or restarting the engine.
X Switch the ignition off and on, and then engage or release
the electric parking brake.
If this does not release the electric parking brake:
X Do not drive on.
X Consult a qualified specialist workshop. 336
Display
messagesPractical advice
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Page 344 of 421

Display messages
Possible causes/consequences and
X
X Solutions  Key not
detected
(white dis-
play mes-
sage) You want to unlock or lock the vehicle and the KEYLESS GO
key* cannot be currently detected by the vehicle.
X
Locate the KEYLESS GO key*.
If the KEYLESS GO key* is still not detected:
X Lock or unlock the vehicle using the key. You are in the vehicle and the KEYLESS GO key* currently
cannot be detected by the vehicle.
X
Change the location of the key with the KEYLESS GO func-
tion* in the vehicle.
If the KEYLESS GO key* is still not detected:
X Remove the KEYLESS GO* button from the ignition lock
(Y page 183).
X Insert the key into the ignition lock and turn it to the desired
position. Â Key not
detected
(red display
message)
The KEYLESS GO key* is not in the vehicle.
If you switch off the engine, you can no longer centrally lock
the vehicle and no longer start the engine.
X
Pull over and stop the vehicle safely as soon as possible,
paying attention to road and traffic conditions.
X Locate the KEYLESS GO key*. The KEYLESS GO key* is not detected while driving because
a powerful radio transmitter is causing interference.
X
Pull over and stop the vehicle safely as soon as possible,
paying attention to road and traffic conditions.
X Remove the KEYLESS GO* button from the ignition lock
(Y page 183).
X Insert the key into the ignition lock and turn it to the desired
position. The KEYLESS GO* key is not detected by the vehicle.
X
Change the location of the key with the KEYLESS GO func-
tion* in the vehicle.
If the KEYLESS GO key* is still not detected:
X Remove the KEYLESS GO* button from the ignition lock
(Y page 183).
X Insert the key into the ignition lock and turn it to the desired
position. Display
messages
341Practical advice
* optional
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Page 345 of 421

Display messages
Possible causes/consequences and
X
X Solutions  Close
doors to
lock vehi‐
cle At least one door is open.
X
Close all doors and lock the vehicle again. & inopera‐
tive Bat‐
tery low The on-board voltage is too low. The auxiliary heating/venti-
lation* has switched off or cannot be switched on.
X
Drive for a longer distance.
The battery is being charged. The auxiliary heating/venti-
lation *can be reactivated as soon as there is sufficient on-
board voltage. & inopera‐
tive
Refuel
vehicle The fuel level in the fuel tank is too low. The auxiliary heat-
ing* cannot be switched on.
X
Refuel at the nearest filling station. & inopera‐
tive See
Owner's
Manual
The auxiliary heating
*is temporarily malfunctioning or is
defective.
X When the vehicle is on a level surface and the engine has
cooled down, make up to four attempts to switch on the
auxiliary heating*, waiting several minutes between each
attempt.
X If the auxiliary heating* does not switch on, visit a qualified
specialist workshop. + Top up
coolant
See Own‐
er's Man‐
ual The coolant level is too low.
X
Top up the coolant, observing the warning notes before
doing so (Y page 294).
X Have the engine cooling system checked at a qualified spe-
cialist workshop if the coolant needs topping up more often
than usual. ? Coolant
Stop vehi‐
cle Turn
engine off The coolant is too hot.
X
Pull over and stop the vehicle safely and switch off the
engine, paying attention to road and traffic conditions.
X Make sure that the air supply to the radiator is not blocked,
e.g. by slush.
X Wait until the display message disappears before restarting
the engine. Otherwise, there is a risk of engine damage.
X Observe the coolant temperature gauge. 342
Display messagesPractical advice
* optional
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Display messages
Possible causes/consequences and
X
X Solutions The poly-V-belt may have torn.
X
Stop immediately and safely when traffic conditions permit
and check the poly-V-belt.
If the poly-V-belt is torn:
X Do not drive on. Consult a qualified specialist workshop.
If the poly-V-belt is intact:
X Wait until the display message disappears before restarting
the engine. Otherwise, there is a risk of engine damage.
X Observe the coolant temperature gauge.
X Have the vehicle checked at a qualified specialist work-
shop. b Third
brake lamp The third brake lamp is faulty. The display message will only
appear if all LEDs have failed.
X
Visit a qualified specialist workshop. b Left-hand
cornering
light
or
Right-
hand cor‐
nering
light The left-hand or right-hand cornering lamp is faulty.
X
Change the bulb (Y page 369). b Left-hand
dipped
beam
or
Right-
hand
dipped
beam The left-hand or right-hand dipped-beam headlamp is faulty.
X
Visit a qualified specialist workshop. b Active
Light
Function
inopera‐
tive
The active light function* is faulty.
X
Visit a qualified specialist workshop. Display
messages
343Practical advice
* optional
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