Auxiliary heating (auxiliary heating and ventilation)
Description and important information The auxiliary heating (auxiliary heating and ventilation) heats or
supplies the interior of the vehicle with fresh air independent of the
engine.
Auxiliary heating (parking heating)
The auxiliary heater (parking heater) functions in connection with the air-condi-
tioning system or Climatronic.
It can be used when stationary, when engine is switched off for preheating of the
vehicle as well as while driving (e.g. during the heating phase of the engine).
The engine is also preheated when the vehicle is stationary and the engine is
switched off, if the auxiliary heating is switched on.
The auxiliary heating (parking heating) warms up the coolant during the combus-
tion of fuel from the vehicle tank. The coolant warms up the air, which (if the
blower speed is not set to zero) flows into the occupant compartment.
Auxiliary ventilation
The auxiliary ventilation enables fresh air to flow into the vehicle interior by
switching off the engine, whereby the interior temperature is effectively de-
creased (e.g. with the vehicle parked in the sun). WARNING
● The auxiliary heating must never be operated in closed rooms - risk of poi-
soning!
● The auxiliary heating must not be running during refueling - risk of fire.
● The exhaust pipe of the auxiliary heating is located on the underside of
the vehicle. Therefore do not place the vehicle, if you wish to operate the aux-
iliary heating, in such a way that the exhaust gases of the auxiliary heating
can come easily into contact with inflammable materials (e.g. dry grass) or
easily inflammable substances (e.g. fuel run out). Note
If the auxiliary heating runs, the fuel consumption comes from the vehicle tank.
The auxiliary heating automatically controls the filling level in the fuel tank. If only
a low quantity of fuel is present in the fuel tank, the function of the auxiliary heat-
ing is blocked.
● The exhaust pipe of the auxiliary heating, which is located on the underside of
the vehicle, must not be clogged and the exhaust flow must not be blocked.
● If the auxiliary heating and ventilation is running, the vehicle battery discharg-
es. If the auxiliary heating and ventilation has been operated several times over a
longer period, the vehicle must be driven a few kilometers in order to recharge the
vehicle battery.
● The auxiliary heating only switches the blower on, if it has achieved a coolant
temperature of approx. 50 °C.
● At low outside temperatures, this can result in a formation of water vapour in
the area of the engine compartment. This is quite normal and is not an operating
problem.
● After switching off the auxiliary heating, the coolant pump runs for a short pe-
riod.
● The auxiliary heating and ventilation does not switch on or comes on, if the
vehicle battery indicates a low loading state ⇒
page 190, Automatic consumer
shut-off.
● The auxiliary heating (parking heating) does not switch on, if the following was
shown in the information display or before switching off the ignition: Please re-
fuel!
● The air inlet in front of the windscreen must be free of ice, snow or leaves in
order to ensure that the auxiliary heating operates properly.
● So that warm air can flow into the vehicle interior after switching on the auxili-
ary heating, you must maintain the comfort temperature normally selected by you
and leave the air outlet vents in an open position. It is recommended to put the air
flow in the position or . 94
Heating and air conditioning system
After selecting the menu
Factory setting in the menu Aux. heating, it is possible
to return to the factory setting.
Radio remote control The auxiliary heating (auxiliary heating and ventilation) can be
switched on or off with the remote control. Fig. 97 Auxiliary heating: Radio remote control/bottom of the radio remote control with the
battery cover
–
For switching on, press the button ON .
– For switching off, press the button OFF .
The transmitter and the battery are housed in the housing of the remote control.
The receiver is located in the interior of the car.
If the battery is properly charged, the effective range is up to 600
m. For switching
on or off the auxiliary heating, hold the remote control vertically with the antenna A
⇒ fig. 97 towards the top. You must not cover over the antenna with the fin-
gers or the palm of the hand. Obstacles between the radio remote control and the
vehicle, bad weather conditions and a weaker battery can clearly reduce the
range.
The auxiliary heating can only be switched on or off with the radio remote control,
if the distance between the radio remote control and the vehicle is at least 2 m.
Warning light in the radio remote control
The warning light in the radio remote control ⇒ fig. 97
indicates after a keystroke
if the remote control signal was received by the auxiliary heating and if the bat-
tery is adequately charged. Display warning light Description
Lights up green for 2 seconds. The auxiliary heating was switched on.
Lights up red for 2 seconds. The auxiliary heating was switched off.
Slowly flashes green for 2 seconds. The ignition signal was not received.
Quickly flashes green for 2 seconds. The auxiliary heating is blocked, e. g
because the tank is nearly empty or
there is a fault in the auxiliary heating.
Flashes red for 2 seconds. The switch off signal was not received.
Lights up orange for 2 seconds, then
green or red. The battery is weak, however the
switching on or off signal was received.
Lights up orange for 2 seconds, then
flashes green or red. The battery is weak, however the
switching on or off signal was not re-
ceived.
Flashes orange for 5 seconds. The battery is discharged, however the
switching on or off signal was not re-
ceived. CAUTION
There are electronic components in the radio remote control, protect the remote
control against water, severe shocks and direct sun rays.
Changing the battery of the radio remote control If the warning light of the radio remote control indicates a weak or discharged
battery,
⇒ fig. 97, it must be replaced. The battery is located under a cover on the
back of the radio remote control.
– Insert a flat, blunt object, such as a coin, into the gap of the battery cover, turn
it against the direction of the arrow up to the mark, and unlock the cover
⇒ fig. 97 - right.
– Change the battery, replace the battery cover and lock it by moving it in the
direction of the arrow. For the sake of the environment
Dispose of a used battery in accordance with environmental regulations. £96
Heating and air conditioning system
Removing fuse cover
–
Move the circlips A ⇒
fig. 177 as far as the stop, the symbol appears behind
the circlip and remove the cover.
Installing fuse cover
– Position the fuse cover on the fuse box and push the circlips A as far as the
stop - the symbol is visible behind the circlip. CAUTION
● When unlocking and locking the fuse cover, it must be pressed on the sides to
the box, otherwise damage can occur to the locking mechanism.
● Carefully position the fuse cover in the engine compartment. If the cover was
not correctly positioned, water can get into the fuses and this results in a damage
to the vehicle!
Fuse assignment in engine compartment Fig. 178 Schematic representation of
fuse carrier in engine compartment
Certain electrical components are only standard on certain vehicle model versions
or only available as optional equipment for certain models. No. Power consumer
F1 Not assigned
F2 Control unit for automatic gearbox DQ 200
F3 Measuring circuit
F4 Valves for ABS
F5 Control unit for automatic gearbox
F6 Instrument cluster, windshield wiper lever and turn signal light lever
F7 Power supply terminal 15, Starter No. Power consumer
F8 Radio
F9 Not assigned
F10 Engine control unit, Main relay
F11 Control unit for auxiliary heating
F12 Control unit for CAN databus
F13 Engine control unit
F14 Ignition
F15 Lambda probe
glow plug system relay
F16 Central control unit, right main headlight, right rear light unit
F17 Horn
F18 Amplifier for digital sound processor
F19 Front window wiper
F20 Water pump
valve for fuel dosing
F21 Lambda probe
F22 Clutch pedal switch, brake pedal switch
F23 Secondary air pump
Air mass meter
Fuel high pressure pump
F24 Activated charcoal filter, exhaust gas recirculation valve
F25 Pump for ABS
F26 Central control unit, left main headlight, left rear light unit
F27 Secondary air pump
Glow plug system
F28 Not assigned
F29 Power supply terminal 30
F30 Terminal X
a) a)
In order not to drain the battery unnecessarily when starting the engine, the electrical components
of this terminal are automatically switched off. 212
Fuses and light bulbs
H
Handbrake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Hazard warning light system . . . . . . . . . . . . . . . . . . . 49 Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Head airbag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144
Headlight cleaning system . . . . . . . . . . . . . . . . . . . . . 55
Headlight flasher . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Headlights Fog lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Headlight cleaning system . . . . . . . . . . . . . . . . . . . . 55
Head restraint . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Heated windscreen washer nozzles . . . . . . . . . . . . 53
Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87 Auxiliary heating (parking heating) . . . . . . . . . . . 94
Defrosting windows . . . . . . . . . . . . . . . . . . . . . . . . . . 87
Recirculated air mode . . . . . . . . . . . . . . . . . . . . . . . 88
Height adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . 137
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
I Ignition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Ignition lock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
Immobiliser . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Information display . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Instrument cluster . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Instrument lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Interior light Luggage compartment . . . . . . . . . . . . . . . . . . . . . . . 52
Interior lighting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Interior mirror . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Interior monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Intermittent wiping . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Internet connection . . . . . . . . . . . . . . . . . . . . . . . . . . 129
ISOFIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
ISOFIX system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 J
Jacking points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203
Jump-starting . . . . . . . . . . . . . . . . . . . . . . . . . . . 206, 207
L Lashing eyes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Leather care . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Light automatic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Changing bulbs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Lights converting/masking over . . . . . . . . . . . . . . . . . . . . 166
Range adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . 49
switching on and off . . . . . . . . . . . . . . . . . . . . . . . . 44
Warning lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Lights and Visibility . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Liquid in reservoir for windscreen washer system Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Loading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Lock Central locking system . . . . . . . . . . . . . . . . . . . . . . . 33
Locking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 Remote control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Locking and unlocking from inside . . . . . . . . . . . . . . 34
Low beam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Luggage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Luggage compartment . . . . . . . . . . . . . . . . . . . . . 35, 66 Fixing of the floor covering . . . . . . . . . . . . . . . . . . 69
Folding double hooks . . . . . . . . . . . . . . . . . . . . . . . . 69
Folding hooks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Lashing eyes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Luggage compartment - variable loading floor . . . . 71
Luggage compartment cover . . . . . . . . . . . . . . . . . . . 70
Luggage rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73 M
Main beam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44, 50
Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Manual gearbox . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
Manual shifting of gears . . . . . . . . . . . . . . . . . . . . . . . 101
Memory for the on-board computer . . . . . . . . . . . . . 14
Mobile phone . . . . . . . . . . . . . . . . . . . . . . . . . 115, 116, 122 Connection to the hands-free system . . . . . . . . 123
Connection with the hands-free system . . . . . . 117
Voice control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
Motoring abroad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166
Multi-functional indicator . . . . . . . . . . . . . . . . . . . . . . 14
Multifunction steering wheel . . . . . . . . . . . . . . . . . . 114
Multimedia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 AUX-IN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
CD changer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130
MDI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
N
Net partition (Estate car) . . . . . . . . . . . . . . . . . . . . . . . 71
Note holder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
O Oil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Oil change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
Oil dipstick . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Onboard computer . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Open door Warning light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Opening a single door . . . . . . . . . . . . . . . . . . . . . . . . . 32
Opening for skis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
Operation in winter Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178
De-icing windows . . . . . . . . . . . . . . . . . . . . . . . . . . . 172
Outside temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 241
Index Using the system Safety Driving Tips General Maintenance Breakdown assistance Technical data