2001 MERCEDES-BENZ C240 sensor

Contents
Malfunction and warning messages
in the multifunction display ... 274
DISPLAY DEFECTIVE ................275
BATTERY / ALTERNATOR ........ 276
ANTILOCK BRAKE SYSTEM .....277
BRAKE ASSIST ...........................277
BRAKE LINING WEAR ..............278
BRAKE FLUID .............................278
PARKING BRAKE .......................279
SEAT BELT SYSTEM ...................279
ELEC. STABIL. PROG.
(Electronic stability program) ..280
COOLANT (coolant level) .......... 281
COOLANT
(coolant temperature) ................282ENGINE OIL LEVEL ................... 283
LIGHTING SYSTEM ................... 284
LIGHT SENSOR .......................... 286
DOOR ........................................... 286
TRUNK OPEN ............................. 287
HOOD ........................................... 287
TELEPHONE – FUNCTION ....... 288
TELE AID ..................................... 288
WASHER FLUID ......................... 289
RESTRAINT SYSTEM ................ 290
KEY .............................................. 290
FUEL RESERVE .......................... 291
UNDERVOLTAGE ....................... 291
STEER. WHEEL ADJUST. .......... 292
ENTRANCE POSITION .............. 292
Practical hintsFirst aid kit .....................................294
Stowing things in the vehicle ......294
Fuses ................................................295
Hood .................................................297
Checking engine oil level .............300
Automatic transmission fluid
level ............................................. 301
Coolant level ................................... 301
Adding coolant ...........................302
Windshield and headlamp washer
system .........................................302
Spare wheel, vehicle tools, storage
compartment .............................304
Vehicle jack .....................................305

66 Restraint systems
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
come on at all or if it fails to extinguish after
approximately 4 seconds or if it comes on thereafter,
a malfunction in the system has been detected.
The following system components are monitored or
undergo a self-check: crash-sensor(s), airbag ignition
circuits, front seat belt buckles, emergency tensioning
retractors, seat sensor.
Initially, when the electronic key is turned from starter
switch position 0 to position 1 or 2, malfunctions in the
crash sensor are detected and indicated (the “SRS”
indicator lamp stays on longer than 4 seconds or does
not come on).
Have the system checked at your authorized
Mercedes-Benz Center immediatelyIn the operational mode, after the indicator lamp has
gone out following the initial check, interruptions or
short circuits in the airbag ignition circuit and in the
driver and front passenger seat belt buckle harnesses,
and low voltage in the entire system are detected and
indicated.
Note:
See page 271 for information on the supplemental
restraint system (SRS) indicator lamp.
Wa r n i n g !
In the event a malfunction of the “SRS” is indicated
as outlined above, the “SRS” may not be
operational. For your safety, we strongly
recommend that you visit an authorized
Mercedes-Benz Center immediately to have the
system checked; otherwise the “SRS” may not be
activated when needed in an accident, which could
result in serious or fatal injury, or it might deploy
unexpectedly and unnecessarily which could also
result in injury.

80 Rear view mirrors
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Rear view mirrors
Inside rear view mirror
Manually adjust the mirror.
Rear view mirror, automatic antiglare
Antiglare mode:
With the electronic key in starter switch position 2, the
mirror reflection brightness responds to changes in
light sensitivity.
With the gear selector lever in position “R”, or with the
interior light switched on, the mirror brightness does
not respond to changes in light sensitivity.Note:
The automatic antiglare function does not react, if
incoming light is not aimed directly at sensors in the
mirror.
Wa r n i n g !
In the case of an accident liquid electrolyte may
escape the mirror housing when the mirror glass
breaks.Electrolyte has an irritating effect. Do not allow the
liquid come into contact with eyes, skin, clothing,
or respiratory system. In cases it does, immediately
flush affected area with water, and seek medical
help if necessary.

84 Rear view mirrors
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Driver’s side exterior mirror, antiglare mode
Antiglare mode:
With the electronic key in starter switch position 2, the
mirror reflection brightness responds to changes in
light sensitivity.
With the gear selector lever in position “R”, or with the
interior light switched on, the mirror brightness does
not respond to changes in light sensitivity.
Note:
The automatic antiglare function does not react, if
incoming light is not aimed directly at sensors in the
mirror.Important!
Electrolyte drops coming into contact with the vehicle
paint finish can only be completely removed while in
their liquid state, by applying plenty of water.
Wa r n i n g !
In the case of an accident liquid electrolyte may
escape the mirror housing when the mirror glass
breaks.Electrolyte has an irritating effect. Do not allow the
liquid come into contact with eyes, skin, clothing,
or respiratory system. In cases it does, immediately
flush affected area with water, and seek medical
help if necessary.

91 Instrument cluster
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index Outside temperature indicator (17)
The temperature sensor is located in the front bumper
area. Due to its location, the sensor can be affected by
road or engine heat during idling or slow driving. This
means that the accuracy of the displayed temperature
can only be verified by comparison to a thermometer
placed next to the sensor, not by comparison to external
displays (e.g. bank signs etc.).
Adaption to ambient temperature takes place in steps
and depends on the prevailing driving conditions (stop-
and-go or moderate, constant driving) and amount of
temperature change.
Note:
The temperature indicator display can be set to read out
in either Fahrenheit or Celsius. See page 111.Trip odometer (13)
To reset to “0” miles / km:
Activate the instrument cluster if it is not already
activated, see page 90.
Press button è or ÿ on the multifunction
steering wheel repeatedly until the trip odometer
appears if it is not displayed. See page 96.
Press button (1) on the instrument cluster, see page 90.
Tachometer (2)
The red marking on the tachometer denotes excessive
engine speed.
Avoid this engine speed, as it may result in serious
engine damage that is not covered by the
Mercedes-Benz Limited Warranty.
To help protect the engine, the fuel supply is interrupted
if the engine is operated within the red marking.
Wa r n i n g !
The outside temperature indicator is not designed
to serve as an Ice-Warning Device and is therefore
unsuitable for that purpose. Indicated
temperatures just above the freezing point do not
guarantee that the road surface is free of ice.

135 Combination switch
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index 6Press switch briefly:
Single wipe without washer fluid
(select only if windshield is wet).
Push switch past resistance point:
Windshield washer system, windshield wipers.
See page 302 for instructions on filling the
windshield washer reservoir.
7Windshield wipers0Off
I Intermittent wiping
Vehicles with optional rain sensor:
One initial wipe, pauses between wipes are
automatically controlled by a rain sensor
monitoring the wetness of the windshield. This
will not occur with a front door open.
Notes:
With switch in this position, one wipe occurs
when turning the electronic key in starter switch
from position 0. This will not occur with a front
door open.
Do not leave in intermittent setting when vehicle
is taken to an automatic car wash or during
windshield cleaning. Wipers will operate in
presence of water spray at windshield, and
wipers may be damaged as a result.
II Normal wiper speed
III Fast wiper speed

228 Catalytic converter
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Catalytic converter
Your Mercedes-Benz is equipped with monolithic type
catalytic converters, an important element in
conjunction with the oxygen sensors to achieve
substantial control of the pollutants in the exhaust
emissions. Keep your vehicle in proper operating
condition by following our recommended maintenance
instructions as outlined in your Service Booklet.
Caution!
To prevent damage to the catalytic converters, use only
premium unleaded gasoline in this vehicle.
Any noticeable irregularities in engine operation should
be repaired promptly. Otherwise, excessive unburned
fuel may reach the catalytic converter causing it to
overheat, which could start a fire.
Wa r n i n g !
As with any vehicle, do not idle, park or operate
this vehicle in areas where combustible 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.

267 Contents - Instrument cluster display
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car care Index
Instrument cluster displayMalfunction and indicator lamps in
the instrument cluster .............268
On-board diagnostic system .........268
Check engine malfunction
indicator lamp .............................268
Brake warning lamp ..................270
Supplemental restraint system
(SRS) indicator lamp .................. 271
Fuel reserve warning ................. 271
ABS malfunction
indicator lamp .............................272
Electronic stability program
(ESP) — warning lamp ...............273
Seat belt nonusage
warning lamp .............................273Malfunction and indicator lamp in
the center console .................... 273
AIRBAG OFF indicator lamp .... 273
Malfunction and warning messages
in the multifunction display ....274
DISPLAY DEFECTIVE ................ 275
BATTERY / ALTERNATOR ........276
ANTILOCK BRAKE SYSTEM .... 277
BRAKE ASSIST ........................... 277
BRAKE LINING WEAR .............. 278
BRAKE FLUID ............................ 278
PARKING BRAKE ....................... 279
SEAT BELT SYSTEM .................. 279
ELEC. STABIL. PROG.
(Electronic stability program) . 280
COOLANT (coolant level) ......... 281COOLANT
(coolant temperature) ................282
ENGINE OIL LEVEL ...................283
LIGHTING SYSTEM ....................284
LIGHT SENSOR ...........................286
DOOR ...........................................286
TRUNK OPEN .............................287
HOOD ...........................................287
TELEPHONE – FUNCTION .......288
TELE AID .....................................288
WASHER FLUID .........................289
RESTRAINT SYSTEM .................290
KEY ...............................................290
FUEL RESERVE .......................... 291
UNDERVOLTAGE ........................ 291
STEER. WHEEL ADJUST. ...........292
ENTRANCE POSITION ..............292