2007 MERCEDES-BENZ C-CLASS SALOON Owners Manual

Troubleshooting
28
6 Warning tone
s Problem Possible cause/consequence Suggested solutions
The anti-theft alarm system* is
suddenly triggered. You have opened the vehicle
using the emergency key element
without deactivating the anti-
theft alarm system* first. Key:
X
Press the Œor the ‹button.
or
X Insert the key into the ignition lock.
The alarm is deactivated.
KEYLESS GO* :
X Grasp the exterior door handle. The KEYLESS GO key* must be
outside the vehicle .
The alarm is deactivated.
or
X Press the KEYLESS GO button* on the dashboard. The KEYLESS
GO key* must be inside the vehicle.
The alarm is deactivated. You hear a warning tone. A message appears in the multi-
function display. X
See the explanations for the display message (Y page 236). You hear a warning tone. You are driving with the parkin
g
brake on. X
Release the parking brake. Practical advice
* optional
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6

Troubleshooting
28
7 Problem Possible cause/consequence Suggested solutions
You hear a warning tone. You have opened the driver's
door and forgotten to switch off
the lights. X
Turn the light switch to Mor* . You hear a warning tone.
G
Risk of injury
The driver or front passenger ha s
not fastened their seat belt. X
Fasten your seat belt (Y page 98). Accident
Problem Possible cause/consequence Suggested solutions
Fuel is leaking from the vehicle.
G
Risk of fire
The fuel line or the fuel tank ha s
been damaged. X
Switch off the ignition immediately.
X Remove the ignition key.
X Do not restart the engine under any circumstances .
The leaking fuel creates a risk of fire or explosion.
X Consult a qualified specialist workshop. You are unable to determine th
e
extent of the damage. X
Consult a qualified specialist workshop. You cannot detect any damage. X
Start the engine as normal. Practical advice
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B
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Troubleshooting
28
8 Problem Possible cause/consequence Suggested solutions
The NECK-PRO head restraint
s
on the driver's and front-
passenger seats have been trig-
gered. Your vehicle has been involved in
a rear-end collision. X
Reset the NECK-PRO head restraints (Y page 303). Fuel and fuel tan
kProblem Possible cause/consequence Suggested solutions
Fuel is leaking from the vehicle.
G
Risk of fire
The fuel line or the fuel tank is
defective. X
Turn the key to position 0in the ignition lock immediately and
remove it.
X Do not restart the engine under any circumstances .
The leaking fuel creates a risk of fire or explosion.
X Consult a qualified specialist workshop. The fuel filler flap cannot be
opened. The fuel filler flap is not released. X
Unlock the vehicle (Y page 300). The opening mechanism is jam-
med. X
Release the fuel filler flap by hand (Y page 302).
X Consult a qualified specialist workshop. Practical advice
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Troubleshooting
28
9 Problem Possible cause/consequence Suggested solutions
The fuel tank has been run com-
pletely dry on a vehicle with
a
diesel engine. There is air in the fuel system. X
Refuel the vehicle.
X Switch on the ignition for approximately 10 seconds (key in posi-
tion 2in the ignition lock).
X Start the engine continuously for up to 40 seconds until it runs
smoothly.
The fuel system is now free of air.
If the engine does not start:
X Wait two minutes .
X Repeat the starting procedure for up to 40 seconds.
If the engine still does not start :
X Consult a qualified specialist workshop. Practical advice
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Troubleshooting
29
0 Engine
Problem Possible cause/consequence Suggested solutions
The engine will not start. You can
hear the starter motor operating. R
There may be a malfunction in
the engine electronics.
R There may be a malfunction in
the fuel supply. X
Turn the key back to position 0in the ignition lock before the nex t
starting attempt.
X Try to start the engine again (Y page 113). When doing so, remem-
ber that excessively long and frequent attempts to start the engin e
will drain the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. Vehicles with a diesel engine:
The engine will not start. You can
hear the starter motor operating
.
The reserve fuel warning lamp is
on and the fuel gauge shows 0. The fuel tank has been run dry. X
Refuel the vehicle.
X Bleed the fuel system (Y page 289). The engine will not start. You can-
not hear the starter motor oper-
ating. The on-board voltage is too low
because the starter battery is too
weak or discharged. X
Jump-start the vehicle (Y page 328).
If the engine does not start despite attempting to jump-start it:
X Consult a qualified specialist workshop. Practical advice
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0

Troubleshooting
29
1 Problem Possible cause/consequence Suggested solutions
Vehicles with a petrol engine:
The engine is not running
smoothly and is misfiring. The engine electronics or
a
mechanical component of the
engine control unit have been
damaged. X
Only depress the accelerator pedal slightly.
X Have the cause rectified immediately at a qualified specialist work-
shop .
Otherwise, non-combusted fuel may get into the catalytic converter
and damage it. A coolant temperature of over
120 °C is displayed. The coolant
warning lamp may also be on and
a warning signal may sound
(
Y page 123). The coolant level is too low. The
coolant is too hot and the engin
e
is no longer being cooled suffi-
ciently. X
Stop as soon as possible and allow the engine and the coolant to
cool down.
X Check the coolant level (Y page 209). Observe the warning notes
as you do so and top up the coolant if necessary. If the coolant level is correct, the
radiator fan may be faulty. The
coolant is too hot and the engin
e
is no longer being cooled suffi-
ciently. X
If the coolant temperature is less than 120°C, you can continue
driving to the nearest qualified specialist workshop.
X Avoid heavy loads on the engine as you do so, e.g. when driving on
mountain roads and stop/start driving . Practical advice
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Troubleshooting
29
2 Automatic transmission
*Problem Possible cause/consequence Suggested solutions
The transmission has problems
shifting gear The transmission is losing oil. X
Have the transmission checked at a qualified specialist workshop
immediately . The acceleration ability is deteri-
orating.
The transmission no longer
changes gear. The transmission is in emergenc
y
mode.
It is only possible to shift into
2nd gear and reverse gear. X
Stop the vehicle.
X Move the selector lever to P.
X Turn the key to position 0in the ignition lock .
X Wait at least 10 seconds before restarting the engine.
X Move the selector lever to position Dor R.
If D is selected, the transmission shifts into 2nd gear; if Ris selec -
ted, the transmission shifts into reverse gear .
X Have the transmission checked at a qualified specialist workshop
immediately . Practical advice
* optional
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Troubleshooting
29
3 Parktronic*
Problem Possible cause/consequence Suggested solutions
Only the red segments in the
Parktronic warning display are lit.
You also hear a warning tone for
approximately two seconds.
Parktronic is deactivated after
approximately 20 seconds and
the indicator lamp in the Park-
tronic button lights up. Parktronic has malfunctioned
and has switched itself off. X
If problems persist, have Parktronic checked at a qualified spe-
cialist workshop. Only the red segments in the
Parktronic warning display are lit.
Parktronic is deactivated after
approximately 20 seconds. The Parktronic sensors are dirty
or there is interference. X
Clean the Parktronic sensors (Y page 230).
X Switch the ignition back on. Only the red segments in the
Parktronic warning display are lit.
Parktronic is deactivated afte
r
approximately 20 seconds. The problem may be caused by an
external source of radio or ultra-
sound waves
. X
See if Parktronic functions in a different location. Practical advice
* optiona l
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