2008 MERCEDES-BENZ B-CLASS HATCHBACK key battery

Air conditioning
139
X
Press the Ubutton.
The indicator lamp in the |button goes
out. Airflow and air distribution are set to
automatic mode.
or
X Press one of the $or% temperature
buttons.
The indicator lamp in the |button goes
out. The air distribution is directed towards
the windscreen. The air conditioning
switches to manual mode.
or
X Turn thumbwheel 1clockwise or anti-
clockwise (Y page 133).
The indicator lamp in the |button goes
out. The air distribution is directed towards
the windscreen. The air conditioning
switches to manual mode. Demisting the windows
Windows misted up on the inside X
Activate the "cooling with air dehumidifica-
tion" function 19
.
X Activate the automatic air conditioning. 20
X If the windows continue to mist up, activate
the "demisting" function.
Windows misted up on the outside X
Activate the windscreen wipers.
X Turn the air distribution thumbwheel to the
Y ora symbol.
i You should only select this setting until
the windscreen is clear again. Switching the rear window heating
on/off
G
Risk of accident
Clear all windows of ice or snow before set-
ting off. Otherwise, impaired visibility could
endanger you and others.
i The rear window heating has a high cur-
rent draw. You should therefore switch it
off as soon as the window is clear, as it only
switches off automatically after several
minutes.
i If the battery voltage is too low, the rear
window heating may switch off.
X Turn the key to position 2in the ignition
lock.
X To activate, press the 121
/F 22
but-
ton.
The indicator lamp in the 1/Fbut-
ton lights up or goes out.
19 Vehicles with air conditioning*/Thermotronic*.
20 Vehicles with Thermotronic*.
21 Vehicles with an air-conditioning system*/Thermotronic*.
22 Vehicles with Heatmatic. Cont
rols
* optional
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Roof
141
X
Convenience opening: press and hold the
Ä button until the side windows have
returned to the original position.
The indicator lamp in the Äbutton goes
out. Air-recirculation mode is deactivated.
The panorama louvred sliding sunroof*
moves to the ventilation position.
i If you open the side windows or the pan-
orama louvred sliding sunroof* manually
after closing with the convenience closing
feature, they will remain in this position
when opened using the convenience open-
ing feature. Switching the residual heat on/off
The "residual heat" function is only available
with Thermotronic*.
It is possible to make use of the residual heat
of the engine to continue heating the station-
ary vehicle for up to 30 minutes after the
engine has been switched off. The heating
time depends on the set interior temperature.
i The blower will run at a low speed regard-
less of the airflow setting.
i If you activate the "residual heat" function
at high temperatures, only the ventilation will be activated. The blower runs at
medium speed.
X Turn the key to position 0in the ignition
lock or remove it.
X To activate: press theTbutton.
The indicator lamp in the Tbutton lights
up.
X To deactivate: press theTbutton.
The indicator lamp in the Tbutton goes
out.
i The residual heat automatically switches
off after around 30 minutes or if:
R the ignition is switched on
R the battery voltage drops Roof
Panorama roof*
G
Risk of injury
The glass in the panorama sunroof* could
break in an accident.
If you are not wearing a seat belt, there is
a risk that you could be thrown through the
opening in the event of the vehicle over-
turning. Therefore, always wear a seat belt
to reduce the risk of injuries. Panorama louvred sliding sunroof*
G
Risk of injury
Make sure that nobody can become trap-
ped when closing the panorama louvred
sliding sunroof. If danger threatens, release
the switch and press the switch again to
reopen the panorama louvred sliding sun-
roof. G
Risk of injury
Never leave children unsupervised in the
vehicle. Always remove the key from the
ignition lock, even if you are leaving the
vehicle only briefly. Controls
* optional
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Trailer towing*
190note that the power output of the engine,
and consequently the vehicle's gradient-
climbing capability, decrease with increas-
ing altitude.
If the trailer swings from side to side:
X Do not accelerate.
X Do not counter-steer.
X Brake if necessary. G
Risk of accident
On no account should you attempt to draw
the vehicle/trailer combination out by
increasing speed. Removing the ball coupling
X Pull the protective cap off the lock in the
handwheel.
X Insert the key into the lock in the hand-
wheel.
X Turn the key clockwise.
The lock is unlocked.
X Hold the ball coupling. Pull the handwheel
away from the ball coupling and turn it
clockwise until it engages.
The green area on the ball coupling is
aligned with the red mark on the hand-
wheel. X
Pull out the ball coupling downwards.
X Clean the ball coupling if it is dirty.
X Vehicles without ECO start/stop func-
tion*: open the stowage compartment on
the right of the luggage compartment.
X Fold the trim downwards.
X Vehicles with start/stop function*:
open the luggage compartment floor.
X Remove the protective cap from the ball
coupling recess.
X Press the protective cap into the ball cou-
pling recess until it engages.
Storing the ball coupling X
Store the ball coupling with the key inser-
ted in the ball coupling recess.
X Vehicle without ECO start/stop func-
tion: Secure the ball coupling in place using
the retainer strap. G
Risk of accident
Do not carry the ball coupling in the vehicle
interior if it is not secured.
Otherwise, you and others could be injured
by the ball coupling being thrown around if
you: R
brake sharply
R change direction suddenly
R are involved in an accident Trailer power supply
When it leaves the factory, your vehicle's
trailer socket outlet is equipped with a per-
manent power supply and a power supply that
is switched on via the ignition lock.
The permanent power supply is supplied via
trailer socket pin 9.
The power supply that is switched on via the
ignition lock is supplied via trailer socket pin
10.
! You can connect consumers with a power
rating of up to 240 W to the permanent
power supply and up to 180 W to the power
supply that is switched on via the ignition
lock.
You must not charge a trailer battery using
the power supply.
The trailer's turn signal lamps are only guar-
anteed to function when bulbs are used.
You can obtain further information about
installing the trailer electrics from a qualified Operation
* optional
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Care
194nozzle of the high-pressure cleaner and the
vehicle (at least 30 cm).
Move the high-pressure cleaner nozzle
around when cleaning your vehicle.
Do not aim directly at any of the following:
R tyres
R door joint
R electrical components
R battery
R connectors
R lights
R seals
R trim elements
Damaged seals or electrical components
can lead to failures or leaks.
Cleaning the wiper blades and the out-
side of the windscreen G
Risk of injury
Before cleaning the windscreen or wiper
blades, turn the key in the ignition to 0.
Otherwise, the windscreen wipers may
move and injure you. X
Turn the key to position 1(Y page 62) in
the ignition lock.
X Set the windscreen wipers to position
I(Y page 82) on the combination switch.
X Turn the key to position 0(Y page 62) or
remove it when the wiper arms are vertical.
! Only fold the windscreen wipers away
from the windscreen when vertical. Other-
wise, you will damage the bonnet.
X Fold the wiper arms away from the wind-
screen.
X Wipe the windscreen and wiper blades with
a damp, lint-free cloth (e.g. a microfibre
cloth) and cleaning agent.
X Fold the wiper arms back on to the wind-
screen before the ignition is switched on.
! Do not clean the wiper blades too often
as this will result in damage to the surface
coating, leading to wiper noise.
Cleaning the windows !
Do not use dry cloths, abrasive products,
solvents or cleaning agents containing sol-
vents to clean the inside of the windows.
Clean the insides of the windows with a
damp cloth or commercially-available glass cleaner. Avoid touching the inside of the
rear windscreen and the side windows with
hard objects, e.g. ice scrapers or rings. You
could otherwise cause damage to the win-
dows, rear window heating or aerial on the
rear window.
i Anti-glare film retrofitted to the insides of
the windows could interfere with radio or
mobile phone reception, especially if it is
conductive or metal-coated film. Informa-
tion about anti-glare film can be obtained
from any Mercedes-Benz Service Centre.
Cleaning the headlamps X
Clean the plastic lenses of the headlamps
with a damp sponge.
! Only use washer fluid which is suitable
for plastic lenses. Unsuitable washer fluid
could damage the plastic lenses of the
headlamps.
Do not use the following:
R dry cloths
R abrasive cleaning agents
R solvents
R cleaning agents containing solvent Operation
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Troubleshooting
223Problem Possible cause/consequence Suggested solutions
The indicator lamp in the
F/
1 rear-window heating button
is flashing. The rear-window heat-
ing has switched itself off prema-
turely or cannot be switched on. The on-board voltage is too low,
because too many consumers are
switched on. X
Switch off consumers that are not required, e. g. reading lamp or
interior lighting.
Once the battery is sufficiently charged, the rear window heating
will switch back on automatically. Vehicles with automatic child
seat recognition on the front-
passenger seat:
The
5 PASSENGER AIRBAG
OFF warning lamp on the centre
console is lit. A special Mercedes-Benz child
seat with automatic child seat
recognition has been fitted to the
front-passenger seat. The front-
passenger airbag has therefore
been disabled as desired.
G
Risk of injury
There is no child seat fitted to the
front-passenger seat. The auto-
matic child seat recognition is
malfunctioning. X
Remove electronic equipment from the front-passenger seat, for
example
R
notebook
R mobile phone
R cards with transponders, e.g. ski passes or access passes
If the 5 PASSENGER AIRBAG OFF warning lamp is still lit:
X Visit a qualified specialist workshop. You have started the engine with
the key. The indicator lamp in the
ECO start/stop function* button
does not light up or goes out
again after a short time. You have deactivated the ECO
start/stop function*. X
Activate the ECO start/stop function* again. The ECO start/stop function*is
not available due to a fault. X
Visit a qualified specialist workshop. Practical advice
* optional
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Troubleshooting
233Engine
Problem Possible cause/consequence Suggested solutions
The engine will not start. You can
hear the starter motor operating. R
The engine electronics system
is malfunctioning.
R There is a malfunction in the
fuel supply.
R The on-board voltage is too low
because the starter battery is
too weak or discharged. X
Turn the key back to position 0(Y page 62) in the ignition lock
before the next starting attempt.
X Try to start the engine again (Y page 86). When doing so, remember
that excessively long and frequent attempts to start the engine will
drain the battery.
If the engine does not start after several attempts:
X Consult a qualified specialist workshop. The engine will not start. You can
hear the starter motor operating.
The reserve fuel warning lamp is
on and the fuel gauge shows
0. The fuel tank has been run dry. X
Refuel the vehicle.
X Bleed the fuel system (Y page 232).The engine will not start. You can-
not hear the starter motor oper-
ating. The on-board voltage is too low
because the starter battery is too
weak or discharged. X
Jump-start the vehicle (Y page 266).
If the engine does not start despite attempting to jump-start it:
X Consult a qualified specialist workshop. The starter motor was exposed to
a thermal load that was too high. X
Allow the starter motor to cool down for approximately two
minutes.
X Try to start the engine again.
If the engine still does not start:
X Consult a qualified specialist workshop. Practical advice
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Troubleshooting
239Key
Problem Possible cause/consequence Suggested solutions
You cannot lock or unlock the
vehicle using the key. The key batteries are discharged
or nearly discharged. X
Point the tip of the key at the driver's door handle from close range
and try to unlock or lock the vehicle again.
If this does not work:
X Unlock the vehicle using the emergency key element
(Y page 241).
X Check the key batteries (Y page 244) and replace them if neces-
sary (Y page 244). The key is faulty. X
Unlock the vehicle using the emergency key element
(Y page 241).
X Have the key checked at a qualified specialist workshop. The battery charge indicator lamp
of the key does not go on during
the test. The key batteries are discharged. X
Change the batteries (Y page 244).You have lost a key. X
Have the 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. You have lost the emergency key
element. X
Report the loss immediately to the vehicle insurers.
X If necessary, have the manual locks changed too. The engine cannot be started
using the key. The steering lock is mechanically
blocked. X
Remove the key and reinsert it into the ignition lock. While doing
this, turn the steering wheel in both directions. Practical advice
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Troubleshooting
240 Trailer towing
Problem Possible cause/consequence Suggested solutions
The ball coupling cannot be
locked.
The key cannot be removed from
the ball coupling.
G
Risk of accident
The ball coupling is dirty.
The trailer tow hitch is damaged. X
Remove the ball coupling and clean it (Y page 196). If the ball cou-
pling still cannot be locked, remove the ball coupling. It must no
longer be used to tow a trailer, as safe operation is not guaranteed.
X Have the entire trailer tow hitch checked at a qualified specialist
workshop. Parking up the vehicle
Problem Possible cause/consequence Suggested solutions
The vehicle is to be left parked up
for longer than six weeks. Damage resulting from non-use
may occur if the vehicle is parked
up for long periods. X
Visit a qualified specialist workshop and seek advice.
X Disconnect the battery ( Ypage 264). Practical advice
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