2006 MERCEDES-BENZ E320CDI key battery

111 Controls in detail
Locking and unlocking
SmartKey with KEYLESS-GO*
Vehicles equipped with KEYLESS-GO come
with two SmartKeys with KEYLESS-GO,
each with remote control and a removable
mechanical key. The locking tabs for the
mechanical key portion of the two Smart-
Keys with KEYLESS-GO are a different col-
or to help distinguish each SmartKey with
KEYLESS-GO unit.
The function of the SmartKey overrules the
KEYLESS-GO function.
The KEYLESS-GO function is integrated
into the SmartKey. On these vehicles, the
validity of the SmartKey with KEYLESS-GO
is checked every time you pull an outside
door handle.
If the SmartKey with KEYLESS-GO is valid,
your vehicle unlocks

the doors


the trunk


the fuel filler flap
SmartKey with KEYLESS-GO 1‹ Lock button
2Š Unlock button for the trunk
3Mechanical key locking tab
4ΠUnlock button
5Battery check lamp
6Â Panic button (
page 91)
iWhen any outside door handle other
than the driver’s outside door handle is
pulled, the vehicle is centrally un-
locked.
Warning!
G
When leaving the vehicle, always take the
SmartKey with KEYLESS-GO with you and
lock the vehicle. Do not leave children unat-
tended in the vehicle, or with access to an
unlocked vehicle. It is possible for children
to open a locked door from the inside, which
could result in an accident and/or serious
personal injury.!To prevent possible malfunction, avoid
exposing the SmartKey with
KEYLESS-GO to high levels of electro-
magnetic radiation.

115 Controls in detail
Locking and unlocking
Selective setting
If you frequently travel alone, you may wish
to reprogram the SmartKey with
KEYLESS-GO so when you pull the driver’s
outside door handle, only the driver’s door
and the fuel filler flap unlocks.
Press and hold buttonsŒ and‹
simultaneously for about 5 seconds un-
til battery check lamp5 (
page 111)
flashes twice.
The SmartKey with KEYLESS-GO will
then function as follows:Unlocking driver’s door and fuel filler
flap

Pull the driver’s outside door handle.

All turn signal lamps flash once.


An acoustic signal sounds once
(if equipped and feature activated).
For more information, see “Factory
setting” (
page 114).


The locking knob in the driver’s
door moves up.


The anti-theft alarm system is dis-
armed.Global unlocking

Pull any outside door handle other than
the driver’s outside door handle.

All turn signal lamps flash once.


An acoustic signal sounds once
(if equipped and feature activated).


The locking knobs in the doors
move up.


The anti-theft alarm system is dis-
armed.

116 Controls in detailLocking and unlockingGlobal locking
Press lock button on an outside door
handle (
page 64) or lock button at
trunk lid (page 117).


All turn signal lamps flash three
times.


An acoustic signal sounds three
times (if equipped and feature acti-
vated).


The locking knobs in the doors
move down.


The anti-theft alarm system is
armed.
Restoring to factory setting

Press and hold buttonsŒ and‹
simultaneously for about 6 seconds un-
til battery check lamp5 (
page 111)
flashes twice.Checking the batteries

Press button‹ orŒ.
Battery check lamp5 (
page 111)
comes on briefly to indicate that the
SmartKey batteries are in order.
!If you can no longer lock or unlock the
vehicle with the SmartKey with
KEYLESS-GO, then the batteries in the
SmartKey are discharged, the
SmartKey with KEYLESS-GO is mal-
functioning or the vehicle battery is
drained.

Check the batteries in the
SmartKey with KEYLESS-GO
(page 116) and replace them if
necessary (
page 431).


Use the mechanical key to unlock
the driver’s door (
page 426) and
the trunk (
page 427).


Use the mechanical key to lock the
driver’s door (
page 426) and the
trunk (
page 128).


Have the vehicle battery checked
by an authorized Mercedes-Benz
Center.
If the SmartKey with KEYLESS-GO is
malfunctioning, contact an authorized
Mercedes-Benz Center.
!If battery check lamp5 does not
come on briefly during check, then the
SmartKey batteries are discharged.
Replace the batteries (
page 431).
You can obtain the required batteries
at any authorized Mercedes-Benz
Center.
iIf the batteries are checked within sig-
nal range of the vehicle, pressing the
button‹ orŒ will lock or unlock
the vehicle accordingly.

147 Controls in detail
Lighting
Interior lighting in the front
1Left front reading lamp on/off
2Rear interior lighting on/off
3Automatic control on/off
4Front interior lighting on/off
5Right front reading lamp on/off
6Ambient lighting
7Interior lighting
8Front reading lampsThe controls are located in the overhead
control panel.
Automatic control
Activating

Press automatic control switch3.
The interior lighting switches on in
darkness when you:

unlock the vehicle


remove the SmartKey from the
starter switch


open a door


open the trunk
The interior lighting switches off automati-
cally following an adjustable time delay.For more information, see “Setting interior
lighting delayed shut-off” (
page 173).
Deactivating

Press automatic control switch3
again.
The interior lighting remains switched
off in darkness, even when you:

unlock the vehicle


remove the SmartKey from the
starter switch


open a door


open the trunk
iLeaving an interior light switch in the
ON position for extended periods of
time with the engine turned off could
result in a discharged battery.
iIf the door remains open, the interior
lighting switches off automatically after
approximately 5 minutes.

410 Practical hintsWhat to do if …Display symbol
Display messages
Possible cause/consequence
Possible solution
Y
Hood open
You are driving with the hood open.

Close the hood (
page 319).
F
Key
Check battery
The SmartKey with KEYLESS-GO* batter-
ies are discharged.

Change the batteries (
page 431).
Key
not recognized
The SmartKey with KEYLESS-GO* is not
recognized while the engine is running
because

the SmartKey with KEYLESS-GO* is
not in the vehicle


there is strong radio-frequency inter-
ference

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

Search for the SmartKey.
Otherwise the vehicle cannot be cen-
trally locked nor can the engine be
started again after the engine is
stopped.
Key
not recognized
The SmartKey with KEYLESS-GO* is mo-
mentarily not recognized.

Change the position of the SmartKey
in the vehicle.

Operate the vehicle with the
SmartKey in the starter switch if nec-
essary.
Key
still in vehicle
A SmartKey with KEYLESS-GO* left in the
vehicle was recognized while locking the
vehicle from the outside.

Take the SmartKey out of the vehicle.
Keyless Go
Check system
The KEYLESS-GO* system is malfunction-
ing.

Visit an authorized Mercedes-Benz
Center as soon as possible.

431 Practical hints
Replacing SmartKey batteries
Replacing SmartKey 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.
SmartKey
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key1
(page 426).
1Mechanical key
2Slide
3Battery compartment

Insert the mechanical key1 in direc-
tion of arrow in side opening.

Using mechanical key1,push gray
slide 2 to unlatch battery compart-
ment 3.
Warning!
G
Keep the batteries out of reach of children.
If a battery is swallowed, seek medical help
immediately.
iWhen inserting the batteries, make
sure they are clean and free of lint.iWhen replacing batteries, always re-
place both batteries.
The required replacement batteries are
available at any Mercedes-Benz Cen-
ter.


432 Practical hintsReplacing SmartKey batteries
Pull battery compartment3
(page 431) out of the housing in di-
rection of arrow.

Remove the batteries4 in direction of
arrow.
4Battery
5Contact spring

Using a lint-free cloth, insert new
batteries4 under the contact spring
5 with the positive terminal (+) side
facing up.

Return battery compartment 3
(page 431) into housing until it locks
into place.

Slide mechanical key 1 (
page 431)
back into the SmartKey.

Check the operation of the SmartKey.
SmartKey with KEYLESS-GO*
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key
(page 426).

Insert the mechanical key1
(page 431) in side opening and push
grey slide2 (
page 431).
Battery compartment3 (
page 431)
is unlatched.

Pull battery compartment3
(page 431) out of the housing in di-
rection of arrow.1Battery
2Tilt battery up
3Mechanical key

Using mechanical key3 apply pres-
sure to position2.
Battery1 tilts up slightly.

Pull out batteries1 in direction of ar-
row.

Using a lint-free cloth, insert new bat-
teries with the positive terminal (+) side
facing up.

Return battery compartment3
(page 431) into housing until it locks
into place.


451 Practical hints
Batteries
Disconnecting the battery
Depress parking brake firmly or move
gear selector lever to positionP.

Turn off all electrical consumers.

Remove SmartKey from starter switch.
Vehicles with KEYLESS-GO*:
Press the start/stop button until
the engine shuts off.

Open the driver’s door.

Open the trunk.
!Never loosen or detach battery termi-
nal clamps while the engine is running
or the SmartKey is in the starter switch.
Otherwise the alternator and other
electronic components could be se-
verely damaged.
Have the battery checked regularly by
an authorized Mercedes-Benz Center.
Refer to Maintenance Booklet for main-
tenance intervals or contact an autho-
rized Mercedes-Benz Center for further
information.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
The electrohydraulic brake system requires
electrical power to operate.
A malfunction in the vehicle’s power supply
or electrical system may impair brake sys-
tem operation and switch it into its emer-
gency operation mode. The same applies if
battery is disconnected. To brake, the driver
must then apply significantly greater brake
pedal pressure and depress the pedal much
further to obtain the expected braking ef-
fect. If necessary, apply full pressure to the
brake pedal. Brakes may only be applied to
the front wheels. Stopping distance is in-
creased! Adjust your driving style according-
ly. For more information, refer to
“Electrohydraulic brake system”
(page 97).
Warning!
G
With a disconnected battery

you will no longer be able to turn the
SmartKey in the starter switch and
pressing the KEYLESS-GO* start/stop
button on the gear selector lever will
have no effect


the gear selector lever will remain
locked in positionP