2007 MERCEDES-BENZ C-CLASS SALOON battery

Troubleshooting
29
8 KEYLESS GO*
Problem Possible cause/consequence Suggested solutions
You cannot lock or unlock th
e
vehicle using the KEYLESS GO
key. The KEYLESS GO key batterie
s
are discharged or nearly dis-
charged. X
Lock or unlock the vehicle using the remote control function of the
key. Point the tip of the key at the driver's door handle from close
range and try to open the vehicle again.
If this does not work:
X Lock or unlock the vehicle using the emergency key element
(Y page 300).
X Check the KEYLESS GO key batteries (Y page 304) and replace
them if necessary (Y page 304). There is a fault with KEYLESS GO. X
Lock or unlock the vehicle using the remote control function of the
key. To do this, point the tip of the key at the driver's door handle
from close range and try to open the vehicle again.
X Have the KEYLESS GO key checked at a qualified specialist work-
shop . There is interference from a pow-
erful source of radio waves. X
Lock or unlock the vehicle using the emergency key element
(Y page 300). The battery check lamp in the
KEYLESS GO key does not light
up when tested. The KEYLESS GO key batteries
are discharged. X
Change the batteries (Y page 304). Practical advice
* optional
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Troubleshooting
29
9 Problem Possible cause/consequence Suggested solutions
The vehicle cannot be started
using the KEYLESS GO key and
the KEYLESS GO button. The KEY-
LESS GO key is in the vehicle. A door is open. The key therefore
cannot be detected so easily. X
Close the door and try to start the vehicle again . You did not depress the brak
e
when starting the engine. X
Depress the brake pedal and press the KEYLESS GO button. There is interference from a pow-
erful source of radio waves
. X
Start your vehicle using the KEYLESS GO key in the ignition lock. You have lost the KEYLESS GO
key
. X
Have the KEYLESS GO key cancelled at a Mercedes-Benz Service
Centre.
X Report the loss immediately to the vehicle insurers .
X If necessary, have the manual locks changed too. Parking up the vehicle
Proble
m Possible cause/consequence Suggested solutions
The vehicle is to be left parked up
for longer than six weeks. X
Visit a qualified specialist workshop and seek advice.
X Disconnect the battery (Y page 326). Practical advice
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Changing the batteries
3041
To fold back
2 To push back
3 To push down
X Push the head restraint cushion backwards
by the lower part as far as it will go 2.
X Push the head restraint cushion down into
the guide as far as it will go 3.
X Firmly press back the head restraint cush -
ion until it engages 1. Changing the batteries
Notes
It is advisable to have the batteries replaced
at a qualified specialist workshop, e.g. at a
Mercedes-Benz Service Centre. G
Risk of poisoning
Batteries contain toxic and caustic sub-
stances. For this reason, keep batteries
away from children.
If a battery is swallowed, consult a docto r
immediately. H
Environmental not
e
Do not dispose of batteries with the house-
hold rubbish. They contain highly toxic sub-
stances .
Take discharged batteries to a qualified
specialist workshop, e.g. a Mercedes-Benz
Service Centre, or to a special collection
point for old batteries. Key or KEYLESS GO key*
Checking the batteries X
Press the jork button.
The batteries are in order if the battery
charge indicator lamp goes on briefly.
Changing the batteries You require two CR 2025 3V cell batteries.
X
Remove the emergency key element from
the key (Y page 300). 1
Emergency key element
2 Battery tray Practical advic
e
* optional
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Changing the bulbs
305
X
Insert emergency key element 1into the
opening in the key and push in the direction
of the arrow.
Battery tray 2is released .
X Pull battery tray 2out of the key. 1
Batterie s
X Remove old batteries 1from the battery
tray.
X Insert the new batteries beneath the con-
tact spring with the positive terminal facing
upwards. Use a lint-free cloth to do so.
X Push the battery tray back into the key
housing until the battery tray engages.
X Check the function of all key buttons on th e
vehicle. Changing the bulbs
Notes on changing bulbs
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that all bulbs function correctly at all times. G
Risk of injury
Bulbs and lamps can be very hot. Yo u
should therefore allow them to cool down
before you change them. Otherwise, you
could be burned if you touch them.
Keep bulbs out of the reach of children.
Otherwise, they could damage them, for
example, and injure themselves.
Never use a bulb which has been dropped.
Such a bulb may explode and injure you.
H7 bulbs are pressurised and could explode
when you change them, particularly if they
are very hot. You should therefore wear eye
protection and gloves when you are chang-
ing them. G
Risk of injury
Xenon bulbs carry a high voltage. You could
get an electric shock and be seriously or
even fatally injured if you touch the electri c
contacts on xenon bulbs. Therefore, neve r
remove the cover from xenon bulbs. Do not change xenon bulbs yourself, but
have them replaced at a qualified specialist
workshop which has the necessary special-
ist knowledge and tools to carry out the
work required .
Mercedes-Benz recommends that you use
a Mercedes-Benz Service Centre for this
purpose. In particular, work relevant to
safety or on safety-related systems must be
carried out at a qualified specialist work-
shop. Practical advice
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Battery
32
4 purpose. In particular, work relevant to
safety or on safety-related systems must be
carried out at a qualified specialist work-
shop.
i On a vehicle with MOExtended tyres*,
only MOExtended spare tyres* should be
used. These must be of the size specified
for the vehicle Battery
Notes on the battery
In order for the battery to achieve the maxi-
mum possible service life, it must always be
sufficiently charged .
Have the battery charge checked more fre-
quently if you use the vehicle mainly for shor t
trips or if you leave it standing idle for a
lengthy period.
To prevent damage from corrosion, only
replace the battery with one that has a central
ventilation cover.
Consult a Mercedes-Benz Service Centre if
you wish to leave your vehicle parked up for
a long period of time. G
Risk of injury
Comply with safety precautions and take
protective measures when handling batter-
ies. Risk of explosion
Fire, naked flames and
smoking are prohibited
when handling the bat-
tery. Avoid creating
sparks. Battery acid is caustic.
Avoid contact with the
skin, eyes or clothing
.
Wear suitable protective
clothing, in particular,
gloves, an apron and face
mask.
Immediately rinse acid
splashes off with clean
water. Consult a doctor if
necessary. Wear eye protection
. Keep children away.
Observe this Owner's
Manual.
H
Environmental not
e
Do not dispose of batteries with the house-
hold rubbish. Dispose of defective batteries
in an environmentally responsible manner.
Take them to a Mercedes-Benz Service Practical advice
* optional
204_AKB; 2; 3, en-G
B
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Battery
32
5 Centre or a special collection point for old
batteries . G
Risk of injury
Mercedes-Benz recommends that, for
safety reasons, you only use batteries
which have been tested and approved for
your vehicle by Mercedes-Benz. These bat-
teries provide increased impact protectio n
to prevent vehicle occupants from suffering
acid burns should the battery be damage d
in the event of an accident .
To prevent acid burns, observe the follow-
ing safety notes when handling batteries:
R Do not lean over batteries .
R Do not place any metal objects on a bat-
tery. You could otherwise cause a short
circuit and the battery's highly flammabl e
gas mixture could ignite.
R Make sure that you do not create elec-
trostatic charge, e.g. by wearing syn-
thetic clothing or as a result of friction on
fabrics. You should not therefore pull or
slide the battery over carpets or other
synthetic materials.
R Never touch the battery first. To dis-
charge a possible electrostatic charge, step out of the vehicle first and touch the
bodywork.
R Do not wipe the battery using a cloth. Th e
battery may explode as a result of elec-
trostatic charge or through the creation
of sparks .
! Switch the engine off and remove the key
before unscrewing or disconnecting the
terminal clamps from the battery. You may
otherwise destroy electronic components
such as the alternator.
Have the starter battery checked and, if
necessary, replaced at a qualified specialist
workshop, e.g. a Mercedes-Benz Service
Centre, every two years or at least every
20,000 km.
i Mercedes-Benz recommends that you
have all work involving the battery, e.g.
removing, charging and replacing, carried
out at a qualified specialist workshop, e.g.
a Mercedes-Benz Service Centre.
Installation location of the battery Depending on its engine type, your vehicle is
equipped with a battery in the engine com-
partment or boot/luggage compartment. It islocated on the right-hand side (direction of
travel) in front of the bulkhead or on the right-
hand side in the spare wheel well.
1
Cove r
2 Clamps Practical advice
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5

Battery
32
6 Battery in the engine compartment
1
Batter y
2 Positive terminal
3 Negative terminal
4 Breather hos e Battery in the boo
t
1 Positive terminal
2 Battery
3 Negative terminal
4 Breather hos e Disconnecting the batter
y G
Risk of accident
If the battery is disconnected:
R there is no brake boosting effect and yo u
will need to apply more pressure to brak e
and the brake pedal travel will be longer ; you may have to depress the brake peda
l
with full force
R you can no longer turn the key in the igni-
tion and with KEYLESS GO*, pressing th e
KEYLESS GO button* on the selector
lever will have no effect
R the selector lever is locked in position P
on vehicles with automatic transmis-
sion*
! Always disconnect the battery in the
sequence described below. Never swap the
terminal clamps. You may otherwise dam-
age the vehicle electronics.
Vehicles with the battery in the engine
compartment:
X Firmly depress the parking brake and shift
the selector lever to position Pon vehicles
with automatic transmission*.
X Switch off all electrical consumers .
X Turn the key to position 0in the ignition
lock and remove it.
X Open the bonnet.
X Remove the retaining clamps on the cover .
X Remove the negative terminal clamp from
the battery. Practical advice
* optional
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6

Battery
32
7
X
Remove the cover from the positive termi-
nal clamp.
X Remove the positive terminal clamp from
the battery.
X Disconnect the breather hose .
Vehicles with the battery in the boot/lug -
gage compartment :
X Firmly depress the parking brake and shift
the selector lever to position Pon vehicles
with automatic transmission*.
X Switch off all electrical consumers .
X Turn the key to position 0in the ignition
lock and remove it.
X Open the boot/luggage compartment.
X Remove the negative terminal clamp from
the battery.
X Remove the cover from the positive termi-
nal clamp.
X Remove the positive terminal clamp from
the battery.
X Disconnect the breather hose . Removing the battery
X Disconnect the battery (Y page 326).
X Loosen the screw which holds the battery
in place.
X Remove the battery. Charging and fitting the batter
y G
Risk of injury
Only charge the installed battery with a bat-
tery charger which has been tested and
approved by Mercedes-Benz. These battery
chargers allow the battery to be charge d
while it is still installed. Otherwise, the vehi -
cle's electronic system may be damaged.
Only charge the battery in a well-ventilate d
area. As the battery is being charged, gases
can escape and generate minor explosions.
This may injure you and other persons or
cause damage to the paintwork or acid cor-
rosion on the vehicle .
You can obtain information about battery
chargers which allow the battery to be
charged when still installed from a qualified
specialist workshop, e.g. a Mercedes-Ben z
Service Centre. G
Risk of injury
There is a risk of acid burns during the
charging process due to the gases which
escape from the battery. Do not lean ove r
the battery during the charging process.
! Only use battery chargers with a maxi-
mum charging voltage of 14.8 V.
X Charge the battery. Observe the notes in
the operating instructions for your battery
charger.
X Refit the charged battery.
To do this, follow the steps described in
"Removing the battery" (Y page 327) in
reverse order. G
Risk of injury
Battery acid is caustic. Avoid contact with
the skin, eyes or clothing . Practical advice
* optional
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