brake MERCEDES-BENZ CLK350 2008 C209 Repair Manual

381 Practical hints
What to do if …?
ProblemPossible cause/consequenceSuggested solution
ú
±(USA only)
(Canada only)The yellow engine
malfunction indi-
cator lamp comes
on while driving.There is a malfunction in:

The fuel management system

The ignition system

The emission control system

Systems which affect emissions
Such malfunctions may result in ex-
cessive emissions values and may
switch the engine to its Limp-Home
Mode (emergency operation).
Have the vehicle checked as soon as possi-
ble at an authorized Mercedes-Benz Center.
An on-board diagnostic connector is used by
the service station to link the vehicle to the
shop diagnostics system. It allows the accu-
rate identification of system malfunctions
through the readout of diagnostic trouble
codes. It is located in the front left area of the
footwell next to the parking brake pedal.
iIn some states you may be required by law
to have the vehicle serviced as soon as the
engine malfunction indicator lamp comes on.
Check local requirements.

394 Practical hints
What to do if …?
Text messages
Display messagePossible cause/consequencePossible solution
ABSABS, ESP
Unavailable
See Operator’s Man.The ABS and ESP® are not available due to
a malfunction.
The BAS is also deactivated.
The brake system is still functioning
normally but without but without the
systems specified above.Continue driving with added caution.
Wheels will lock during hard braking,
reducing steering capability.
Have the system checked at an autho-
rized Mercedes-Benz Center as soon
as possible.
Failure to follow these instructions in-
creases the risk of an accident.
Cruise Con-
trol And
SPEEDTRONICInoperativeCruise control is malfunctioning.Have the cruise control checked at an au-
thorized Mercedes-Benz Center.
ESPInoperative
See Operator’s ManualThe ESP® has switched off due to a
malfunction.
The ABS and the BAS might not be opera-
tional.
The brake system is still functioning
normally but without the systems speci-
fied above.Continue driving with added caution.
Contact an authorized Mercedes-Benz
Center as soon as possible.
Failure to follow these instructions
increases the risk of an accident.

395 Practical hints
What to do if …?
Display messagePossible cause/consequencePossible solution
ESPUnavailable
See Operator’s ManualThe ESP® is temporarily not available.
The system’s self-diagnosis may not be
completed yet.
The ABS and the BAS might not be
operational.
The brake system is still functioning normally
but without the systems specified above.Drive a short distance with added
caution at a vehicle speed of above
12 mph (20 km/h).
When the message disappears, the
ESP
® is available again.
If the message does not disappear:
Continue driving with added caution.
Have the system checked at an autho-
rized Mercedes-Benz Center as soon as
possible.
Failure to follow these instructions increas-
es the risk of an accident.
The charging voltage has fallen below 10 volts.
The ESP® has switched off.
The BAS may be switched off, too. The battery
may not be charged. The battery or the gener-
ator may be malfunctioning.
The ABS might not be operational.
The brake system is still functioning normally
but without the systems specified above.
Continue driving with added caution.
When the voltage is above this value
again, the ESP
® is operational again.
Have the system checked at an autho-
rized Mercedes-Benz Center as soon as
possible.

402 Practical hints
What to do if …?
Warning!G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle. You
may lose control of the vehicle. Continued
driving with a flat tire will cause excessive
heat build-up and possibly a fire.
Warning!G
Follow recommended tire inflation
pressures.
Do not underinflate tires. Underinflated tires
wear excessively and/or unevenly, adverse-
ly affect handling and fuel economy, and are
more likely to fail from being overheated.
Do not overinflate tires. Overinflated tires
can adversely affect handling and ride com-
fort, wear unevenly, increase stopping dis-
tance, and result in sudden deflation
(blowout) because they are more likely to
become punctured or damaged by road
debris, potholes etc.

404 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
2Brake WearThe brake pads have reached their
wear limit.Have the brake pads replaced as soon as
possible.
;(USA only)
!(Canada only)
Release
Parking BrakeYou are driving with the parking brake
set.Release the parking brake (page 53).
;(USA only)
3 (Canada only)
Check
Brake Fluid
LevelThere is insufficient brake fluid in the
reservoir.Risk of accident! Stop the vehicle in a safe
location or as soon as it is safe to do so
and notify an authorized Mercedes-Benz
Center. Do not add brake fluid! This will
not solve the problem.
Warning!G
Driving with the message Check Brake
Fluid Level
displayed can result in an ac-
cident. Have your brake system checked im-
mediately. Do not add brake fluid before
checking the brake system. Overfilling the
brake fluid reservoir can result in spilling
brake fluid on hot engine parts and the
brake fluid catching fire. You could be seri-
ously burned.
!If you find that the brake fluid in the brake
fluid reservoir has fallen to the minimum mark or
below, have the brake system checked for brake
pad thickness and leaks.!Brake pad thickness must be visually
checked by a qualified technician at the intervals
specified in the Maintenance Booklet.

406 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
•Coolant
Stop vehicle,
turn engine off.The coolant is too hot.
Among other possible causes, the
poly-V-belt could be broken.Stop the vehicle in a safe location or
as soon as it is safe to do so.
Apply the parking brake (page 59).
Turn off the engine.
Check the poly-V-belt.
If it is broken:
Do not continue to drive. Otherwise
the engine will overheat due to an in-
operative water pump which may re-
sult in damage to the engine. Contact
an authorized Mercedes-Benz Center.
If it is intact:
Wait for the message to disappear be-
fore restarting the engine.
Doing otherwise could result in seri-
ous engine damage that is not covered
by the Mercedes-Benz Limited War-
ranty.
(Continued on next page)

410 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
I Change
Key BatteriesThe SmartKey with KEYLESS-GO* batter-
ies are discharged.Change the batteries (page 441).
Key Detected
In VehicleA SmartKey with KEYLESS-GO* left in the
vehicle was recognized while locking the
vehicle from the outside.Take the SmartKey out of the vehicle.
Key
Not DetectedThe SmartKey with KEYLESS-GO* is mo-
mentarily not recognized.Change the position of the SmartKey
in the vehicle.
Operate the vehicle with the SmartKey
in the starter switch if necessary.
Key
Not DetectedThe SmartKey with KEYLESS-GO* is not
recognized while the engine is running be-
cause

the SmartKey is not in the vehicle

there is strong radio-frequency inter-
ference
Stop the vehicle as soon as it is safe to
do so.
Apply the parking brake (page 59).
Search for the SmartKey.
Otherwise the vehicle cannot be centrally
locked nor can the engine be started
again after the engine has been stopped.
Please
get a new key.No additional code available for SmartKey
or SmartKey with KEYLESS-GO*Contact an authorized Mercedes-Benz
Center as soon as possible.

411 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
I Please don’t
forget your keyThis display appears (for a maximum of
60 seconds) if the driver’s door is opened
with the engine shut off and no SmartKey in
the starter switch.
Message is only a reminder.Insert SmartKey in the starter switch.
Take the SmartKey with
KEYLESS-GO* with you when leaving
the vehicle.
Remove KeyYou have forgotten to remove the SmartKey.Remove the SmartKey from the start-
er switch.
. Active Headlamps
Auxiliary Bulb OnThe active headlamps are malfunctioning. An-
other light is being used.Contact an authorized Mercedes-Benz
Center as soon as possible.
Active Headlamps
InoperativeThe Bi-Xenon cornering lamps system is mal-
functioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
AUTO-Light
InoperativeThe light sensor is malfunctioning. The head-
lamps switch on automatically.Contact an authorized Mercedes-Benz
Center as soon as possible.
To switch off the headlamps:
In the control system, set lamp opera-
tion to manual mode (
page 162).
Switch off the headlamps using the
exterior lamp switch (
page 129).
3rd
Brake LampThe high mounted brake lamp is malfunction-
ing. This message will only appear if a critical
number of LEDs have stopped working.Contact an authorized Mercedes-Benz
Center as soon as possible.

412 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
. Brake Lamp
LeftThe left brake lamp is malfunctioning.Replace the bulb as soon as possible
(
page 448).
Brake Lamp
RightThe right brake lamp is malfunctioning.Replace the bulb as soon as possible
(
page 448).
Front Foglamp
LeftThe left front fog lamp is malfunctioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
Front Foglamp
RightThe right front fog lamp is malfunctioning.Contact an authorized Mercedes-Benz
Center as soon as possible.
Front Left
Parking LampThe left front parking lamp is
malfunctioning. Replace the bulb as soon as possible
(
page 447).
Front Right
Parking Lamp
The right front parking lamp is
malfunctioning.Replace the bulb as soon as possible
(
page 447).
Front Left
Turn SignalThe left front turn signal lamp is malfunc-
tioning.Replace the bulb as soon as possible
(
page 447).
Front Right
Turn SignalT h e r i g h t f r o n t t u r n s i g n a l l a m p i s m a l f u n c-
tioning.Replace the bulb as soon as possible
(
page 447).
High Beam
LeftThe left high beam lamp is malfunction-
ing.Replace the bulb as soon as possible
(
page 446).
High Beam
RightThe right high beam lamp is malfunction-
ing.Replace the bulb as soon as possible
(
page 446).

419 Practical hints
What to do if …?
Display symbolDisplay messagesPossible cause/consequencePossible solution
HPlease correct
the tire pressure.The tire pressure is too low in one
or more tires.Check and correct tire inflation pressure as
required (
page 344).
Tire Pressure
Caution
Tire DefectOne or more tires are deflating.Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.
If necessary, change the wheel (page 452).
Tire Pressure
Check TiresThe tire pressure in one or more
tires is already below the mini-
mum value.Carefully bring the vehicle to a halt, avoiding
abrupt steering and braking maneuvers.
Check and adjust tire pressure as required
(
page 344).
If necessary, change the wheel (page 452).
Warning!G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle. You
may lose control of the vehicle. Continued
driving with a flat tire will cause excessive
heat build-up and possibly a fire.
Warning!G
Follow recommended tire inflation
pressures.
Do not underinflate tires. Underinflated tires
wear excessively and/or unevenly, adverse-
ly affect handling and fuel economy, and are
more likely to fail from being overheated.
Do not overinflate tires. Overinflated tires
can adversely affect handling and ride com-
fort, wear unevenly, increase stopping dis-
tance, and result in sudden deflation
(blowout) because they are more likely to
become punctured or damaged by road
debris, potholes etc.