key battery MERCEDES-BENZ E320 2003 W211 User Guide

309 Practical hints
What to do if …
Display
Possible cause
Suggested solution
F
Key
Check battery!
The batteries in the KEYLESS-GO*
key are discharged.

Change the batteries (
page 328).
Key
not recognized!
The KEYLESS-GO* key is not recog-
nized while the engine is running be-
cause

the card is not in the vehicle


there is strong radio-frequency
interference

Stop the vehicle as soon as it is safe to do
so.

Search for the card or continue to operate
the vehicle with the key.
Otherwise the vehicle cannot be centrally
locked nor can the engine be started again
after the engine is stopped.
The KEYLESS-GO* key is momen-
tarily not recognized.

Change the position of the card in the vehi-
cle.

Operate the vehicle with the key if neces-
sary.
ì
Function
Not available!
This display appears if button ì
or í on the multifunction steer-
ing wheel is pressed and the vehicle
is not equipped with a telephone.

328 Practical hintsUnlocking/locking in an emergencyUnlocking the trunk
The trunk can no longer be locked with the
key.
Lock and unlock the trunk with the me-
chanical key as follows:Trunk lid lock1Unlocking
2Locking
Insert the mechanical key in the trunk
lid lock.

Turn the key to the left in position1
and hold it in this position.

Pull on the trunk lid handle and lift the
trunk lid.
Locking the vehicle
If you are unable to lock the vehicle with
the SmartKey, lock it with the mechanical
key as follows:
Close the passenger doors and the
trunk.

Press the central locking switch in the
cockpit (
page 100).

Check to see whether the locking
knobs on the passenger doors are still
visible. If necessary, push them down
manually.

Lock the driver’s door with the me-
chanical key (
page 327).

Check if the trunk is locked. If neces-
sary lock the trunk with the mechanical
key (
page 98).
Changing batteries
If the batteries in the SmartKey are dis-
charged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced at an autho-
rized Mercedes-Benz Center.
Batteries contain materials that can harm
the environment if disposed of improperly.
Recycling of batteries is the preferred
method of disposal. Many states require
sellers of batteries to accept old batteries
for recycling.Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.

329 Practical hints
Unlocking/locking in an emergency
SmartKey/SmartKey with KEY-
LESS-GO*
1Mechanical key
2Battery compartment
Replacement batteries: Lithium, type
CR 2025 or equivalent.

Remove mechanical key1
(page 327).

Insert the mechanical key in the side
opening and push the gray slide.
Battery compartment2 is unlatched.

Pull battery compartment2 out of the
key housing in direction of arrow.
3Battery
4Contact spring

Remove the batteries.

Using a lint-free cloth, insert new bat-
teries under the contact spring with the
plus (+) side facing up.

Return battery compartment into hous-
ing until it locks into place.
Fuel filler flap emergency release
1Release knob
Remove right-side tail trim.

Turn release knob1 clockwise (arrow).
The fuel filler flap can know be opened.
iWhen changing batteries, always re-
place both batteries.
The required replacement batteries are
available at any authorized
Mercedes-Benz Center.

344 Practical hintsBatteries
Disconnecting the battery
Depress the parking brake firmly or
move the gear selector lever to
positionP.

Open the trunk (
page 261).

Disconnect battery negative lead1.

Remove cover2 from the positive ter-
minal.

Disconnect the battery positive lead.
Removing the battery
Remove the screw-nuts securing the
battery.

Remove the battery bracket.

Take out the battery.
Charging and reinstalling the battery
Charge battery in accordance with the
instructions of the battery charger
manufacturer.

Reinstall the charged battery. Follow
the previously described steps in re-
verse order.
!Never loosen or detach battery termi-
nal clamps while the engine is running
or the key is in the starter switch. Oth-
erwise the alternator and other elec-
tronic components could be severely
damaged.
Have the battery checked regularly by
an authorized Mercedes-Benz Center.
Contact your authorized
Mercedes-Benz Center for further infor-
mation.Warning!
G
Do not place metal objects on the battery as
this could result in a short circuit.
Use leak-proof battery only to avoid the risk
of acid burns in the event of an accident.
Warning!
G
With a disconnected battery

the brake boosting effect is not avail-
able.
You need more power to brake and
brake pedal travel is increased. If neces-
sary, you must depress the brake pedal
with full power.


you can no longer turn the ignition key
or, in cars with KEYLESS-GO*, pressing
the KEY-LESS-GO button* on the gear
selector lever has no effect.


the gear selector lever is locked in
position P.

350 Practical hintsTowing the vehicle
Installing towing eye bolt
Front of vehicle
1Cover on right side of front bumperTo remove cover:

Press mark on cover in direction of ar-
row.

Lift cover off to reveal threaded hole for
towing eye bolt.
The towing eye bolt is supplied with the
tool kit (located in the storage compart-
ment under the trunk floor).

Screw towing eye bolt in to its stop and
tighten with lug wrench.
To reinstall cover:

Fit cover and snap into place.
!When towing the vehicle with all wheels
on the ground, please note the follow-
ing:
With the automatic central locking acti-
vated and the key in starter switch
position2, or KEYLESS-GO* start/stop
button (if so equipped) in position2,
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 cen-
tral locking (
page 99).
Towing of the vehicle should only be
done using the properly installed tow-
ing eye bolt. Never attach tow cable,
tow rope or tow rod to the vehicle chas-
sis, frame or suspension parts.
iThe selector lever will remain locked in
positionP and the key will not turn in
the starter switch if the battery is dis-
connected or discharged. See notes on
the battery (
page 343) or on jump
starting (
page 346).

379 Technical terms
Restraint systems
Seat belts, belt tensioners, airbags and
child restraint systems. As indepen-
dent systems, their protective func-
tions complement one another.
RON
(R
esearch O
ctane N
umber)
The Research Octane Number for gaso-
line as determined by a standardized
method. It is an indication of a gaso-
line's ability to resist undesired detona-
tion (knocking). The average of both
the ->MON (Motor Octane Number)
and RON (Research Octane Number) is
posted at the pump, also known as
ANTI-KNOCK INDEX.
SBC
(S
ensotronic B
rake C
ontrol)
Electronically controlled hydraulic
braking system for increased braking
safety and comfort.Shift lock
When the vehicle is parked, this lock
prevents the transmission selector le-
ver from being moved out of positionP
without key turned and brake pedal de-
pressed.
SRS
(S
upplemental R
estraint S
ystem)
Seat belts, emergency tensioning de-
vice and airbags. Though independent
systems, they are closely interfaced to
provide effective occupant protection.
Tele Aid System
(T
elematic A
larm I
dentification on D
e-
mand)
The Tele Aid system consists of three
types of response: automatic and man-
ual emergency, roadside assistance
and information. Tele Aid is initially ac-
tivated by completing a subscriber
agreement and placing an acquain-
tance call.The Tele Aid system is operational pro-
viding that the vehicle’s battery is
charged, properly connected, not dam-
aged and cellular and GPS coverage is
available.
Telematics*
A combination of the terms "telecom-
munications" and "informatics".
Tightening torque
Force times lever arm (e.g. a lug
wrench) with which threaded fasteners
such as wheel bolts are tightened.
Tire speed rating
Part of a tire designation; indicates the
speed range for which a tire is ap-
proved.
Traction
Force exerted by the vehicle on the
road via the tires.

383 Index
Batteries, vehicle
Charging 344
Disconnecting 344
Messages in display 303, 304
Reconnecting 345
Removing 344
Service 343
Battery discharged
Jump starting 346
Bi-Xenon headlamps* 375
Blocking
Rear window operation 71
Brake assist system (BAS) 375
Brake pads
Message in display 305
Brakes
Warning lamp 291
Bulbs, replacing
Front lamps 332, 334
High beam bulb (Bi-Xenon* headlamps
only) 334
License plate lamps 336
Parking lamps 335
Standing lamps 335
Tail lamp assemblies 336C
CAC (Customer Assistance Center) 375
Calling up
Distronic* settings 128
Range (distance to empty) 147
CAN system 375
Cargo area see Trunk 88
Cargo tie-down rings 225
Cassette player
Operating 128
CD player*
Operating 127, 128
Center console
Lower part 26
PASSENGER AIRBAG OFF indicator
lamp 294
Upper part 25
Centigrade
Setting temperature units 134
Central locking
Automatic 99
From inside 100
Switch 100
Switching on/off (control
system) 142
Unlocking from inside 100Central locking switch 100
Changing
Batteries (SmartKey) 329
Key setting 143
Vehicle level 210
Charcoal filter 180
Charging
Vehicle batteries 344
Child safety 65
Airbags 58
Infant and child restraint systems 61,
65
Child safety switch see Blocking of rear
window operation 71
Cigarette lighter 232
Cleaning
Headlamps 158
Parktronic* system sensor 284
Windshield 48
Cleaning and care of the vehicle
Distronic system sensor 283
MB Tex upholstery 285
Climate control 162
Adjusting 166
Defrosting 167
Setting the temperature 165

389 Index
Key, Mechanical 327
Key, SmartKey
Battery check lamp 87
Checking the batteries 88
Factory setting 87
Global locking 87
Global unlocking 87
Loss of 89
Positions in starter switch 31
Remote controls 86
Restoring to factory setting 87
Selective setting 87
Starting the engine 44
Turning off the engine 52
Unlocking the trunk lid 88
Unlocking with 30
Key, SmartKey with KEYLESS-GO*
Turning off the engine 53
KEYLESS-GO*
Activating ignition with 33
Closing side windows 92
Closing sliding/pop-up roof* 92
Factory setting 91
Global locking 91
Global unlocking 91
Important notes 90Locking the vehicle 92
Remote controls 89
Starting the engine 44
Turning off engine 53
Unlocking with 32
Unlocking, trunk lid 92
KEYLESS-GO* card
Messages in display 309
Keys 86
Kickdown 156, 377
Kilometers/miles in speedometer 134
Km/h or mph in speedometer 134
L
Lamp bulbs, exterior 332
Lamps, exterior
Front 332
Light sensor 313
Messages in display 313–??
Replacing bulbs for rear 333, 336
Lamps, indicator and warning
ABS 289
Airbag Off 61
Battery (SmartKey) 87
Brakes 291
Coolant 292
DTR* 199ESP 288
SBC 77
Seat belts 293
SRS 56
Language
Multifunction display 135
Setting 135
Layout of poly-V-belt drive 359
Level control system
AIRMATIC DC 209
Lever
Cruise control 201
License plate lamps 333
Messages in display 316
Replacing bulbs 336
Light sensor 313
Lighter see Cigarette lighter 232
Lighting 112
Automatic headlamp mode 113
Combination switch 115
Daytime running lamp mode 114
Door entry lamps 117
Exterior lamp switch 112
Front fog lamps 114
High beams 115
Instrument cluster illumination 118