2006 MERCEDES-BENZ C55AMG key battery

102 Controls in detail
Locking and unlocking
Trunk emergency release
With the emergency release button, the
trunk can be opened from inside the trunk.
The emergency release button is located
on the inside of the trunk lid.
1Emergency release button
Briefly press emergency release
button1.
The trunk unlocks and the trunk lid
opens.Illumination of the emergency release
button:

The button flashes 30 minutes after
opening the trunk.

The button flashes 60 minutes after
closing the trunk.
!
The trunk lid swings open upwards
automatically.
i
The emergency release button unlocks
and opens the trunk while the vehicle is
standing still or in motion.
i
The emergency release button does
not open the trunk lid if the vehicle
battery is discharged or disconnected.
i
If the vehicle has previously been
locked with the SmartKey, opening the
trunk from the inside using the emer-
gency release button will trigger the
anti-theft alarm system*.
To cancel the alarm, do one of the
following:

Press buttonŒ or‹ on the
SmartKey.

Insert the SmartKey in the starter
switch.

120 Controls in detail
Lighting
Interior lighting
The controls are located in the overhead
control panel.
1Rear interior lights on/off
2Right front reading lamp on/off
3Rocker switch for automatic control
system
4Left front reading lamp on/offDeactivating automatic control
Press the= symbol on rocker
switch3.
The interior lighting remains switched
off in darkness, even when you

unlock the vehicle

open a door

remove the SmartKey from the
starter switchActivating automatic control
Press rocker switch3 to center
position.
The interior lighting switches on in
darkness, when you

unlock the vehicle

open a door

remove the SmartKey from the
starter switch
The interior lighting switches off after a
preset time (
page 147).
!
Leaving an interior light switch in the
ON position for extended periods of
time with the engine turned off could
result in a discharged battery.
i
If the door remains open, the interior
lamps switch off automatically after
approximately 5 minutes, when the
SmartKey is removed or in starter
switch position0.
An interior lamp switched on manually
does not go out automatically.

349 Practical hints
What to do if …
Where will I find ...?
Unlocking/locking in an emergency
Opening/closing in an emergency
Resetting activated head restraints
Replacing SmartKey batteries
Replacing bulbs
Replacing wiper blades
Flat tire
Battery
Jump starting
Towing the vehicle
Fuses

392 Practical hints
Replacing SmartKey batteries
If the batteries in the SmartKey are
discharged, the vehicle can no longer be
locked or unlocked. It is recommended to
have the batteries replaced at an
authorized 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.
i
When inserting the batteries, make
sure they are clean and free of lint.
i
When replacing batteries, always
replace both batteries of both
SmartKeys.
The required replacement batteries are
available at any Mercedes-Benz
Center.

393 Practical hints
Replacing SmartKey batteries
SmartKey
Replacement batteries: Lithium, type
CR 2025 or equivalent.
Remove the mechanical key
(
page 386).
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.
Pull battery compartment3 out of the
housing in direction of arrow.
4Battery
5Contact spring
Remove the batteries4 in direction of
arrow.
Using a lint-free cloth, insert new
batteries4 under the contact
spring5 with the positive terminal (+)
side facing up.
Return battery compartment3 into
housing until it locks into place.
Slide mechanical key1 back into the
SmartKey.
Check the operation of the SmartKey.

411 Practical hints
Battery
Battery
The battery is located in the engine
compartment on the right hand side.
1Clamps
Removing filter box:
Release clamps1.
Remove filter box.
Installing filter box:
Insert filter box properly.
Secure it with clamps1.
Warning!G
Failure to follow these instructions can
result in severe injury or death.
Observe all safety instructions and
precautions when handling automotive
batteries (
page 303).
Never lean over batteries while connecting,
you might get injured.
Battery fluid contains sulfuric acid. Do not
allow this fluid to come in contact with eyes,
skin or clothing. In case it does, immediately
flush affected area with water and seek
medical help if necessary.
A battery will also produce hydrogen gas,
which is flammable and explosive. Keep
flames or sparks away from battery, avoid
improper connection of jumper cables,
smoking, etc.
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.
!
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
maintenance intervals or contact an
authorized Mercedes-Benz Center for
further information.

412 Practical hints
Battery
1Negative terminal
2Positive terminal cover
Disconnecting the battery
Depress the parking brake pedal.
Make sure the gear selector lever is set
to positionP.
Turn off all electrical consumers.
Turn off the engine (page 56).
Remove SmartKey from starter switch.
Open the hood (page 297).
Remove the filter box (page 411).
Disconnect the battery negative lead
from negative terminal1.
Remove cover2 from the positive
terminal.
Disconnect the battery positive lead.
Removing the battery
Remove the screw-nuts securing the
battery.
Remove the battery bracket.
Pull out the battery ventilation hose
from the battery (depending on battery
arrangement in your vehicle model, the
ventilation hose is located either on the
left or right side of the battery).
Take out the battery.
Warning!G
With a disconnected battery

you will no longer be able to turn the
SmartKey in the starter switch

the gear selector lever will remain
locked in positionP
!
Always disconnect the battery in the
order described below. Otherwise the
vehicle’s electronics can be damaged.

413 Practical hints
Battery
Charging and reinstalling the batteryCharge battery in accordance with the
instructions of the battery charger
manufacturer.
Reinstall the charged battery. Follow
the previously described steps in
reverse order.
Reconnecting the battery
Turn off all electrical consumers.
Remove SmartKey from starter switch.
Connect the battery positive lead and
fasten its cover2.
Connect the battery negative lead.
Reinstall the filter box (page 411).
Warning!G
Never charge a battery while still installed in
the vehicle unless the accessory battery
charge unit approved by Mercedes-Benz is
being used. Gases may escape during charg-
ing and cause explosions that may result in
paint damage, corrosion or personal injury.
An accessory battery charge unit specially
adapted for Mercedes-Benz vehicles and
tested and approved by Mercedes-Benz is
available, permitting the charging of the bat-
tery in its installed position. Contact an au-
thorized Mercedes-Benz Center for
information and availability. Charge battery
in accordance with the separate instruc-
tions for the accessory battery charger.
!
The battery, its filler caps and the bat-
tery ventilation hose must always be
securely installed when the vehicle is in
operation.
!
Always connect the battery in the order
described below. Otherwise the
vehicle’s electronics can be damaged.
!
Never invert the terminal connections!