Page 327 of 430

324 Malfunction and warning messages
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car care Index
CHIP-CARD (KEYLESS-GO)
* C = Category, see page 303.1 Check battery of KEYLESS-GO-card, see page 372.
2 The KEYLESS-GO-card cannot be recognized by the running
engine (e.g. strong radio-frequency interference) or the card is not
in the vehicle.
Stop immediately and search for the KEYLESS-GO-card or continue
to operate the vehicle with the electron ic key, ot her wis e the vehic le
cannot be centrally locked or the engine started again after the
engine stops automatically. See page 37.
3 The KEYLESS-GO-card was momentarily not recognized. If
message repeats, place card in a different position or continue to
operate the vehicle with the electronic key, see page 37.
4 A KEYLESS-GO-card left inside the vehicle has been recognized
while locking the vehicle from the outside, see page 37.
5 The message appears for a maximum 60 seconds each time the
driver’s door is opened, as long as no electronic key is in the
starter switch. The message appears regardless of the past
operation method (electronic key or KEYLESS-GO-card), see
page 37. Line 1 Line 2 C*
CHIP CARD CHECK BATTERY!
1
2
CHIP CARD NOT RECOGNIZED!
2
1
CHIP CARD NOT RECOGNIZED!
3
2
CHIP CARD STILL IN VEHICLE!
4
1
CHIP CARD DO NOT FORGET!
5
1
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Page 328 of 430
325 Malfunction and warning messages
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car care Index SELECTOR LEVER (Vehicles with KEYLESS-GO only)
Place selector lever in position “P”.
The message appears when attempting to turn off the
engine while the selector lever is in any other position
than “P”, see page 234.AIR CLEANER
* C = Category, see page 303.Line 1 Line 2 C*
REPLACE AIR CLEANER VISIT WORKSHOP! 2
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Page 332 of 430

329 Contents - Practical hints
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Practical hintsFirst aid kit .....................................330
Fuses ................................................ 331
Shelf below rear window ..............333
Hood .................................................334
Checking engine oil level .............337
Automatic transmission
fluid level ...................................338
Active body control
(ABC) fluid level ........................338
Coolant level ...................................339
Adding coolant ...........................339
Windshield and headlamp
washer system ...........................340
Windshield and headlamp
washer fluid mixing ratio .........340Spare wheel, vehicle tools, storage
compartment ............................. 341
Jack .................................................. 342
Wheels ............................................ 343
Tire Replacement ....................... 343
Rotating wheels ......................... 344
Spare wheel .................................... 344
Changing wheels ........................... 346
Tire inflation pressure ................. 351
Battery ............................................. 352
Jump starting ................................. 355
Towing the vehicle ........................ 357
Exterior lamps ............................... 360
Headlamp assembly .................. 361
Taillamp assemblies .................. 364
Standby bulb function .................. 367Changing batteries
in the electronic key .................369
Synchronizing
remote control ............................ 371
Changing batteries in
the KEYLESS-GO-card ..............372
Emergency engine shut-down ..... 374
Fuel filler flap,
manual release .......................... 374
Emergency operation of
sliding/pop-up roof ...................375
Replacing wiper blades ................. 376
Roof rack .........................................378
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Page 356 of 430

353 Battery
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index The maintenance-free battery is located in the trunk
under the right-hand wheel well cover panel.
For battery removal or installation, or jump starting the
vehicle, first lift the trunk floor, then turn lock (1)
counterclockwise and remove cover.Important!
Battery replacement information:
The service life of the battery is dependent on its
condition of charge. The battery should always be kept
sufficiently charged, in order to last an optimum length
of time.
Therefore, we strongly recommend that you have the
battery charge checked frequently, and corrected if
necessary, especially if you use the vehicle less than
approximately 200 miles (300 km) per month,
mostly for short distance trips, or if it is not used for
long periods of time.
Only charge a battery with a battery charger after the
battery has been disconnected from the vehicle’s
electrical circuit.
Always disconnect the battery negative lead first and
connect last.
When removing and connecting the battery, always
make sure that all electrical consumers are off and the
electronic key is in starter switch position 0. The
battery, its filler caps, the vent tube and the opposite
plug must always be securely installed when the vehicle
is in operation.
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Page 357 of 430

354 Battery
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
While the engine is running the battery terminal clamps
must not be loosened or detached, otherwise the
generator and other electronic components would be
damaged.
Note:
The selector lever will remain locked in position “P” and
the electronic key cannot be turned in the starter
switch, if the vehicle battery is disconnected or
discharged.
After reconnecting the battery also set the clock (see
COMAND operator’s manual) resynchronize the express
feature of the power windows (see page 185), the
sliding /pop-up roof (see page 188), and the electronic
stability program (see page 279).Battery recycling
Batteries contain materials that can harm the
environment with improper disposal.
Large 12 Volt storage batteries contain lead.
Recycling of batteries is the preferred method of
disposal.
Many states require sellers of batteries to accept old
batteries for recycling.
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Page 360 of 430

357 Towing the vehicle
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index Towing the vehicleImportant!
When towing the vehicle, please, note the following:
With the automatic central locking activated and the
electronic key in starter switch position 2 (vehicles with
KEYLESS-GO: in “On” position, see page 230), the
vehicle doors lock if the left front wheel as well as the
right rear wheel are turning at vehicle speeds of approx.
9 mph (15 km/h) or more.
To prevent the vehicle door locks from locking,
deactivate the automatic central locking.This can be
adjusted in the individual setting menu “VEHICLE” –
“AUTOMATIC DOOR LOCK”. See page 144.
Towing of the vehicle should only be done using the
properly installed towing eye bolt. Never attach tow
cable, tow rope or tow rod to vehicle chassis, frame
or suspension parts.
Note:
The selector lever will remain locked in position “P” and
the electronic key cannot be turned in the starter switch
if the battery is disconnected or discharged. See battery
on page 352 or jump starting on page 355.
Wa r n i n g !
Prior to towing the vehicle with all wheels on the
ground, make certain that the electronic key is in
starter switch position 2.If the electronic key is left in the starter switch
position 0 for an extended period of time, it can no
longer be turned in the switch. In this case, the
steering is locked. To unlock, remove electronic key
from starter switch and reinsert.
J_OM_215.book Seite 357 Mittwoch, 30. Mai 2001 2:01 14
Page 362 of 430

359 Towing the vehicle
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index We recommend that the vehicle be transported using
flat bed equipment. This method is preferable to other
types of towing.
Important!
To prevent damage during transport, do not tie down
vehicle by its chassis or suspension parts.
The vehicle may be towed with all wheels on the ground
and the selector lever in position “N” for distances up to
30 miles (50 km) and at a speed not to exceed 30 mph
(50 km/h). The electronic key must be in starter switch
position 2.
To be certain to avoid a possibility of damage to the
transmission, however, we recommend the drive shaft
be disconnected at the rear axle drive flange for any
towing beyond a short tow to a nearby garage.
Do not tow with sling-type equipment. Towing with
sling-type equipment over bumpy roads will damage
radiator and supports.
Use wheel lift, dolly, or flat bed equipment, with
electronic key in starter switch turned to position 0.Note:
To signal turns while being towed with hazard warning
flasher in use, turn electronic key in starter switch to
position 2 and activate combination switch for left or
right turn signal in usual manner – only the selected
turn signal will operate.
Upon canceling the turn signal, the hazard warning
flasher will operate again.
Caution!
If the vehicle is towed with the front axle raised, the
engine must be shut off (electronic key in starter switch
position 0 or 1). Otherwise, the ESP will immediately be
engaged and will apply the rear wheel brakes.
Switch off the tow-away alarm (see page 64) and the
automatic central locking, see individual setting menu
“VEHICLE” – “AUTOMATIC DOOR LOCK” on page 144.
Wa r n i n g !
With the engine not running, there is no power
assistance for the braking and steering systems. In
this case, it is important to keep in mind that a
considerably higher degree of effort is necessary to
brake and steer the vehicle.
J_OM_215.book Seite 359 Mittwoch, 30. Mai 2001 2:01 14
Page 372 of 430
369 Electronic key
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index Changing batteries in the electronic key
1Transmit buttons
2Lamp for battery check and function control
Checking batteries
If one of the transmit buttons (1) is pressed, the battery
check lamp (2) lights up briefly – indicating that the
batteries are in order.
Change batteries if the battery check lamp (2) does not
light up briefly.Changing batteries
Move locking tab (3) in direction of right arrow and
remove mechanical key (4, left arrow).
P80.20-2201-26
1
2
P80.35-2029-26
4
3
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