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32Keys, doors and windowsIf the hazard warning lights do not
flash upon activation, a door or the
bonnet is not fully closed.
Notice
Changes to the vehicle interior, e.g.
the use of seat covers, and open
windows, could impair the function
of passenger compartment
monitoring.
Deactivation
Unlocking the vehicle or switching on
the ignition deactivates the anti-theft
alarm system. Hazard warning lights
flash once to confirm deactivation.
Notice
If the alarm has been triggered,
unlocking the vehicle with the key
will not stop the alarm siren. To stop the siren, switch on the ignition. The
hazard warning lights will not flash
upon deactivation if the alarm has
been triggered.
Activation without monitoring of
passenger compartment
Switch off monitoring of the
passenger compartment when
people or animals are being left in thevehicle, or if the auxiliary heater
3 111 is set for a timed or remote
controlled start.
Depending on vehicle configuration:
● press and hold e, or
● switch ignition on and off twice quickly, then close doors and
activate the anti-theft alarm
system
An audible signal will sound as
confirmation.
The status will remain until the doors
are unlocked.
Alarm
When triggered, the alarm sounds via a separate battery-backed power
sounder, and the hazard warning
lights flash simultaneously. The
number and duration of alarm signals
are stipulated by legislation.
If the vehicle battery is disconnected
or its power supply is interrupted, the
alarm siren will be triggered. First
deactivate the anti-theft alarm system if the vehicle battery must be
disconnected.
To silence the alarm siren (if
triggered) and therefore deactivate
the anti-theft alarm system, reconnect vehicle battery and unlock vehicle
with remote control button c (or
switch on the ignition).
Immobiliser
The system is part of the ignition
switch and checks whether the
vehicle is allowed to be started with
the key being used.
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Climate control111Additional air conditioning is supplied
to the rear passenger compartment
via the overhead air vents.
Fan speed
Adjust the air flow to select the
desired speed.
turn clockwise:increase air flowturn anti-clock‐
wise:decrease air flow
Combi
Additional air conditioning is supplied
to the rear passenger compartment
via the air vents located above the
driver and front passenger
compartment.
With the front passenger
compartment air conditioning system
switched on, adjust the air flow to
select the desired speed.
Ensure the air vents are open when in use, to prevent ice forming in the
system due to lack of air movement.
Auxiliary heater
Coolant heater The Eberspächer engine-
independent, fuel-powered coolant
heater provides rapid heating of the
engine coolant to enable heating of
the vehicle interior without the engine
running.9 Warning
Do not operate the system when
refuelling, when dust or
combustible vapours are present
or in enclosed spaces (e.g.
garage).
Before starting or programming the
system to start, turn the vehicle's
climate control system to heat, set the
air distribution to V and turn the fan
on.
Switch off when not required. Heating stops automatically after the
programmed runtime. It will also
cease to operate if the vehicle fuel
level drops too low.
During operation, power from the
vehicle battery is used. The driving
time should therefore be at least as
long as the heating time. For short
journey times, check the vehicle
battery regularly and recharge if
necessary.
To ensure efficient performance,
briefly operate the auxiliary heater
once a month.
Control units
The timer or remote control unit turns the system on and off, and is used to
programme specific departure times.
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Vehicle care165Charging the vehicle battery9Warning
On vehicles with stop-start
system, ensure that the charging potential does not exceed
14.6 volts when using a battery
charger. Otherwise the vehicle
battery might be damaged.
9 Danger
Ensure adequate ventilation when
charging the battery. There is a
risk of explosion if gases
generated during charging are
allowed to accumulate!
Jump starting 3 193.
Warning label
Meaning of symbols:
● No sparks, naked flames or smoking.
● Always shield eyes. Explosive gases can cause blindness or
injury.
● Keep the vehicle battery out of reach of children.
● The vehicle battery contains sulfuric acid which could cause
blindness or serious burn
injuries.
● See the Owner's Manual for further information.
● Explosive gas may be present in the vicinity of the battery.
Additional battery Depending on the vehicle's auxiliary
equipment, certain models may have
an additional battery mounted under
the front seat.
Diesel fuel filter
Drain diesel fuel filter of residual
water at every engine oil change.
Page 232 of 239

230IndexAAbsorptive Glass Mat battery .....163
Accessories and vehicle modifications .......................... 158
Adaptive forward lighting ...100, 169
AdBlue .......................... 89, 128, 201
Adblue gauge ............................... 80
AdBlue tank ................................ 224
Adjustable air vents ...................115
AGM battery ............................... 163
Airbag and belt tensioners ...........86
Airbag deactivation ................55, 86
Airbag label................................... 51 Airbag system .............................. 51
Air conditioning regular operation ................................ 117
Air conditioning system .............. 106
Air intake .................................... 116
Air suspension ........................... 125
Air suspension system................ 195
Air vents...................................... 115
Antifreeze ................................... 161
Antilock brake system ................ 137
Antilock brake system (ABS) .......88
Anti-theft alarm system ................31
Anti-theft bolts............................. 188
Anti-theft locking system .............. 31
Anti-theft security lock ..................21
Appearance care ........................197
Armrest ........................................ 45Ashtrays ....................................... 79
Automatic light control .................97
Automatic locking ...................21, 25
Autostop ............................. 121, 122
Auxiliary heater ........................... 111
B
Battery discharge protection ......104
Battery, jump starting.................. 193
Belts.............................................. 48 BlueInjection ............................... 128
Bonnet ....................................... 159
Brake assist ............................... 139
Brake fluid .......................... 163, 201
Brakes ............................... 137, 163
Brake system ............................... 88
Breakdown.................................. 195
Bulb replacement ....................... 167
C Capacities .................................. 224
Cargo management system ........69
Car Pass ...................................... 19
Catalytic converter .....................127
Central locking system ................21
Centre high-mounted brake light 172
Changing tyre and wheel size ...184
Charging system .......................... 87
Child locks ................................... 25
Child restraint installation locations ................................... 58