2005 MERCEDES-BENZ CL55AMG sensor

227 Controls in detail
Driving systems
Minimum distance
If the system detects an obstacle in this
range, all the distance warning segments
illuminate and you hear a warning signal. If
the obstacle is closer than the minimum
distance, the actual distance may no long-
er be indicated by the system.
Warning indicators
Visual signals indicate to the driver the rel-
ative distance between the sensors and an
obstacle. The warning indicators for the
front area are located above the left air
vents and center air vents in the dash-
board. The warning indicator for the rear
area is integrated in the rear trim.1Left side of the vehicle
1Right side of the vehicleEach warning indicator is divided into six
yellow and two red distance segments for
either side of the vehicle. The Parktronic
system is ready when the border around
the indicator is illuminated.
The position of the gear selector lever de-
termines which warning indicators will be
activated.Center
approx. 8 in (20 cm)
Corners
approx. 6 in (15 cm)
Gear selector
lever position
Warning indicator
D
Front area activated
R or N
Front and rear area
activated
P
Neither activated

229 Controls in detail
Driving systems
Parktronic system malfunction
If only the red distance segments illumi-
nate and an acoustic warning sounds,
there is a malfunction in the Parktronic
system. The Parktronic system will auto-
matically switch off after 20 seconds and
the indicator lamp in the Parktronic switch
comes on.
Have the Parktronic system checked
by an authorized Mercedes-Benz Cen-
ter as soon as possible.If only the red distance segments illumi-
nate and no acoustic warning sounds, the
Parktronic system sensors are dirty or
there is an interference from other radio or
ultrasonic signals. The Parktronic system
will automatically switch off after 20 sec-
onds and the indicator lamp in the Park-
tronic switch comes on.

Switch off ignition (
page 34).

Clean Parktronic system sensors
(page 320).

Switch on ignition.
or

Check Parktronic system operation at
another location to rule out interfer-
ence from outside radio or ultrasonic
signals.

268 OperationDriving instructionsCatalytic converter
Your Mercedes-Benz is equipped with
monolithic-type catalytic converters, an
important element in conjunction with the
oxygen sensors to achieve substantial con-
trol of the pollutants in the exhaust emis-
sions. Keep your vehicle in proper
operating condition by following our rec-
ommended maintenance instructions as
outlined in your Maintenance Booklet.
Emission control
Certain systems of the engine serve to
keep the toxic components of the exhaust
gases within permissible limits required by
law.
These systems, of course, will function
properly only when maintained strictly ac-
cording to factory specifications. Any ad-
justments to the engine should therefore
be carried out only by qualified
Mercedes-Benz Center authorized techni-
cians.
Engine adjustments should not be altered
in any way. Moreover, the specified service
jobs must be carried out regularly accord-
ing to Mercedes-Benz servicing require-
ments. For details refer to the
Maintenance Booklet.
!To prevent damage to the catalytic con-
verters, use only premium unleaded
gasoline in this vehicle.
Any noticeable irregularities in engine
operation should be dealt with prompt-
ly. Otherwise, excessive unburned fuel
may reach the catalytic converter,
causing it to overheat and potentially
start a fire.
Warning!
G
As with any vehicle, do not idle, park or op-
erate this vehicle in areas where combusti-
ble materials such as grass, hay or leaves
can come into contact with the hot exhaust
system, as these materials could be ignited
and cause a vehicle fire.

294 OperationTires and wheelsChecking tire inflation pressure
Regularly check your tire inflation pressure
at least once a month.
Check and adjust the tire inflation
pressure when the tires are cold. The tires
can be considered cold if the vehicle has
been parked for at least three hours or
driven less than one mile (1.6 km).
If you check the tire inflation pressure
when the tires are warm (the vehicle has
been driven for several miles or sitting less
than three hours), the reading will be
approximately 4 psi (0.3 bar) higher than
the cold reading. This is normal. Do not let
air out to match the specified cold tire in-
flation pressure. Otherwise, the tire will be
underinflated.Checking tire inflation pressure
manually
Follow the steps below to achieve correct
tire inflation pressure:

Remove the cap from the valve on one
tire.

Firmly press a tire gauge onto the
valve.

Read tire inflation pressure on tire
gauge and check against the recom-
mended tire inflation pressure on the
placard on the driver’s door B-pillar
(page 292). If necessary, add air to
achieve the recommended tire inflation
pressure.

Install the valve cap.

Repeat this procedure for each tire.
Checking tire inflation pressure
electronically*
The tire inflation pressure monitor only
functions on wheels that are equipped with
the proper electronic sensors. It monitors
the tire inflation pressure, as selected by
the driver, in all four tires. A warning is
issued to alert you to a decrease in tire
inflation pressure in one or more of the
tires.
You can call up the tire inflation pressure
monitoring display using the control
system (
page 137).
iIf you have overfilled the tire, release
tire inflation pressure by pushing the
metal stem of the valve with e.g. a tip of
a pen. Then recheck the tire inflation
pressure with the tire gauge.

320 OperationVehicle careCleaning the Distronic* system sensor
cover
1Distronic system sensor cover
Use a mild car wash detergent, such as
Mercedes-Benz approved Car Sham-
poo, with plenty of water to clean sen-
sor cover1.
To prevent scratches, never apply strong
force and use only a soft, non-scratchy
cloth when cleaning the sensor cover. Do
not attempt to wipe dirty sensors with a
dry cloth or sponge.Cleaning the Parktronic* system
sensors
1Parktronic system sensors

Clean the sensors1 on the bumpers
using a mild car wash detergent, such
as Mercedes-Benz approved Car Sham-
poo, with plenty of water and a soft,
non-scratchy cloth.
When using a steam cleaner or power
washer, aim nozzle only briefly from a min-
imum distance of 12 in (30 cm) at
sensors1.
Do not apply strong pressure to the sensor
cover, applying strong pressure may dam-
age the sensor cover.To prevent scratches, never apply strong
force and only use a soft, non-scratchy
cloth when cleaning the sensor. Do not at-
tempt to wipe dirty sensors with a dry cloth
or sponge.
Wiper blades

Turn on the wipers and place it in a ver-
tical position.
For information on placing the wipers to a
vertical position, see “Replacing wiper
blades” (
page 379).
!The windshield wipers must be in a ver-
tical position before folding them away
from the windshield. They could other-
wise damage the hood.

349 Practical hints
What to do if …?
When the message
ADD 1.0 QT. OIL AT
FILLING STATION (Canada:
1 Liter
) ap-
pears while the engine is running and at
operating temperature, the engine oil level
has dropped to approximately the mini-
mum level.When this occurs, the warning will first
come on intermittently and then stay on if
the oil level drops further.
Visually check for oil leaks. If no obvious oil
leaks are noted, drive to the nearest ser-
vice station where the engine oil should be
topped to the required level with an ap-
proved oil specified in the Factory Ap-
proved Service Products pamphlet.
Display
Possible cause
Possible solution
:
ENGINE OIL
VISIT WORKSHOP
It may be that there is water in the engine
oil.

Have the engine oil level checked
(page 275).
ENGINE OIL LEVEL
VISIT WORKSHOP
The engine oil has dropped to a critical
level.

Check the engine oil level (
page 275)
and add engine oil as required
(
page 278).

If you must add engine oil frequently,
have the engine checked for possible
leaks.
OIL SENSOR MALFUNCT.
VISIT WORKSHOP
The measuring system is malfunctioning.

Have the measuring system checked by
an authorized Mercedes-Benz Center.
!The engine oil level warnings should
not be ignored. Extended driving with
the symbol displayed could result in
serious engine damage that is not
covered by the Mercedes-Benz Limited
Warranty.

353 Practical hints
What to do if …?
Display
Possible cause
Possible solution
.
LIGHT SENSOR
DRIVE TO WORKSHOP
The lamp sensor is malfunctioning. The
headlamps switch on automatically.

In the control system, set lamp operation
to manual (
page 157).

Switch on headlamps using the exterior
lamp switch.

Visit an authorized Mercedes-Benz
Center as soon as possible.
LOW BEAM, LEFT
CHECK LIGHT
The left low beam lamp is malfunctioning.
Halogen headlamp:
Replace the bulb as soon as possible.
Bi-Xenon* headlamp:

Visit an authorized Mercedes-Benz
Center as soon as possible.
LOW BEAM, RIGHT
CHECK LIGHT
The right low beam lamp is malfunction-
ing.
Halogen headlamp:
Replace the bulb as soon as possible.
Bi-Xenon* headlamp:

Visit an authorized Mercedes-Benz
Center as soon as possible.
MARKER LIGHT, FL
CHECK LIGHT

The front left side marker lamp is mal-
functioning.

Replace the bulb as soon as possible.
MARKER LIGHT, FR
CHECK LIGHT

The front right side marker lamp is mal-
functioning.

Replace the bulb as soon as possible.

364 Practical hintsWhat to do if …?Display
Possible cause
Possible solution
TIRE PRES. MONITOR
CURRENTLY
UNAVAILABLE
The tire inflation pressure monitor* is un-
able to monitor the tire inflation pressure
due to:

the presence of several when sensors in
the vehicle


excessive wheel sensor temperatures


a nearby radio interference source


unrecognized wheel sensors installed

Remove any extra wheel sensors from the ve-
hicle
As soon as the causes of the malfunction have
been removed, the tire inflation pressure moni-
tor automatically becomes active again.
TIRE PRES. MONITOR
NOT OPERATIONAL DRIVE TO WORKSHOP
The tire inflation pressure monitor or a
wheel sensor is malfunctioning.

Have the tire inflation pressure monitor
checked by an authorized Mercedes-Benz
Center.
A wheel without proper sensor was in-
stalled.

Have the wheels checked.
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. Contin-
ued driving with a flat tire will cause exces-
sive heat build-up and possibly a fire.