
Description and function of the airbags
First read and observe the introductoryinformation and safety warnings⇒
Introduction
The airbags can protect vehicle occupants during frontal and side collisions by reducing their 
movement in the direction of the collision.
When an airbag is triggered, it is inflated by a gas generator. This causes the airbag covers to 
break, and the airbags inflate forcefully to cover their deployment zones within milliseconds. Once a 
vehicle occupant wearing a seat belt starts to sink into the inflated airbag, the gas inside the airbag 
starts to escape to cushion the occupant and slow down their movement. This can reduce the risk 
of severe and fatal injuries. A triggered airbag will not always prevent other injuries from occurring, 
such as swelling, bruising, burning and grazing. The deployment of the airbag can also produce 
frictional heat.
Airbags provide no protection for the arms or lower body. Exception: in vehicles with a knee airbag, 
the knee area of the driver will be protected.
The most important factors for triggering the airbag are the type of accident, the angle of impact, 
the vehicle speed and the type of object with which the vehicle collides. Therefore, visible damage 
to the vehicle does not always mean that the airbag should have been triggered.
Whether or not the airbag triggers is determined by the vehicle deceleration rate caused by the 
collision and registered by the electronic control unit. If this rate is below the reference value 
programmed into the control unit, the airbags will not be triggered, even though the vehicle may be 
badly damaged as a result of the collision. Vehicle damage, repair costs or even the lack of vehicle 
damage in an accident do not necessarily give an indication of whether an airbag should inflate or 
not. It is not possible to define a range of vehicle speeds and reference values, since the 
circumstances will vary considerably between one collision and another. It is therefore impossible to 
cover every possible kind and angle of impact that would trigger the airbags. Important factors in 
the triggering of the airbag include the nature (hard or softyf  R I  W K H  R E M H F W  W K D W  W K H  Y H K L F O H  K L W V   W K H  
angle of impact, and the vehicle speed.
Airbags only serve as a supplement to the three-point seat belt in some accident situations when 
the vehicle braking is sufficient to trigger the airbags. Airbags can only be triggered once and only 
in certain situations. The seat belts are always there to provide protection in situations in which the 
airbags are not triggered or have already been triggered. For example, if the vehicle collides with a 
further vehicle following the initial collision, or is hit by another vehicle.
The airbag system is part of the vehicle's overall passive safety concept. The airbag system can 
only work effectively when the occupants are wearing their seat belts correctly and have assumed a 
proper sitting position ⇒ Sitting position.
Components of the vehicle safety concept
The following vehicle safety equipment makes up the vehicle's safety concept to reduce the risk of 
severe and fatal injuries. Some of this equipment may not be fitted in your particular vehicle. It may 
not be available at all in some countries.
•Optimised seat belts for all seats.
•Belt tensioners for the driver and front passenger and also on the rear outer seats if in 
conjunction with side airbags.
•Belt tension limiter for the driver, front passenger and, if applicable, for the rear outer seats.
•Belt height adjuster for the front seats.
•Warning lamp  and belt status display.
•Front airbags for driver and front passenger.
•Side airbags for the driver, front passenger and, if applicable, for the rear outer seats.
•Curtain airbags on the left and right.
•If applicable, knee airbag for the driver.
•Airbag indicator lamp .
•Indicator lamp PASSENGER AIR BAG  in the upper section of the centre console.
•Indicator lamp PASSENGER AIR BAG  in the upper section of the centre console.
•Control units and sensors.
•Whiplash-optimised and height-adjustable head restraints.
•Adjustable steering column.
•If applicable, anchor points for child seats on the rear outer seats and on the front passenger 
seat.
•If applicable, securing points for the top tether for child seats.
Situations when the front, knee, side and curtain airbags will not be 
triggered:
•If the ignition is switched off during a collision.
•If the level of deceleration measured by the control unit is too low during a collision at the front 
of the vehicle.
•During a minor side collision.
•During rear collisions. 

The refill bottle must be disposed of in accordance with regulations governing the protection 
of the environment.
Catalytic converter
First read and observe the introductoryinformation and safety warnings⇒
Introduction
To help ensure long-term functionality in the exhaust system and the catalytic converter:
•Use unleaded petrol only ⇒ Fuel types and refuelling.
•Do not allow the fuel tank to run completely empty.
•Do not overfill engine oil ⇒ Engine oil.
•Do not tow start the vehicle. Use jump leads ⇒ Jump starting.
If you notice misfiring, uneven running or loss of power when the vehicle is moving, reduce speed 
immediately. The vehicle should be inspected at the nearest qualified workshop 
⇒ Troubleshooting. If this happens, unburnt fuel can enter the exhaust system and escape into the 
atmosphere. The catalytic converter can also be damaged by overheating.
The emissions may have a sulphur-like smell even if the emission purification system is 
working properly.
Particulate filter
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Function
The particulate filter filters out soot particles in the exhaust gas. Observe the following points to 
ensure that the exhaust purification system will work properly for a long time:
AdBlue is an irritant and corrosive fluid that can damage the skin, eyes and breathing 
passages upon contact.
•Always observe the instructions for use when using AdBlue. If containers are used 
according to the instructions, it is unlikely that a user will come into contact with 
AdBlue.
•AdBlue must be kept in the closed original container. Never use empty food 
containers, bottles or other containers for this purpose.
•Always store in a safe place out of reach of children.
•If AdBlue gets into the eyes, immediately rinse the eyes with plenty of water for at 
least 15 minutes and consult a doctor.
•If AdBlue gets onto the skin, immediately wash the area with plenty of water for at 
least 15 minutes and consult a doctor if the skin becomes irritated.
•If AdBlue is swallowed, immediately rinse the mouth out with lots of water for at least 
15 minutes. Do not induce vomiting unless instructed to do so by a doctor. Seek 
medical assistance immediately.
CAUTION
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Overfilling AdBlue may damage the tank system and the vehicle.
•Do not fill with more than the maximum refill quantity indicated on the instrument 
cluster display.
•Remove any spilt AdBlue as quickly as possible with a damp cloth and plenty of cold 
water.
•If the AdBlue has already formed crystals, use warm water and a sponge to remove.
NOTICE
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Improper use of AdBlue may cause damage to the vehicle that is not covered by the 
warranty.
•Only use AdBlue that complies with the standard ISO 22241-1.
•Do not mix with water, fuel or additives.
•Never fill AdBlue in the diesel tank.
•Do not transport the refill bottle in the vehicle habitually. The bottle may develop a leak 
following changes in temperature and damage and the AdBlue may damage the 
vehicle interior.
NOTICE
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Dispose of the 12-volt vehicle battery in accordance with the regulations. 12-volt vehicle 
batteries may contain toxic substances such as sulphuric acid and lead.
Electrolyte can pollute the environment. Clean up any service fluid leakages and dispose of 
them properly.
Troubleshooting
First read and observe the introductoryinformation and safety warnings⇒
Introduction
12-volt vehicle battery
Fault in the alternator. Go to a qualified workshop. Have the electrical system checked. Switch 
off any electrical consumers that are not required. The 12-volt vehicle battery will not be charged by 
the alternator while the vehicle is in motion. The start/stop system cannot start the engine. 
⇒ Start/stop system 
Wheels and tyres
Tyre monitoring systems
 Introduction
This chapter contains information on the followingsubjects:
⇒ Types of tyre monitoring systems
⇒ Tyre Pressure Loss Indicator
⇒ Tyre Pressure Monitoring System
⇒ Troubleshooting for the Tyre Pressure Loss Indicator
⇒ Troubleshooting for the Tyre Pressure Monitoring System
The tyre monitoring system warns the 
driver when the tyre pressures get too 
low.
Incorrectly securing the battery and using incorrect 12-volt vehicle batteries can cause 
short circuits, fire and serious injuries.
•Always use maintenance-free and leak-proof 12-volt vehicle batteries that have the 
same properties, specifications and dimensions as the factory-fitted 12-volt vehicle 
battery.
•In vehicles with the 12-volt vehicle battery in the luggage compartment, ensure that the 
breather hose is connected properly to the 12-volt vehicle battery. Make sure that no 
open gas discharge openings are located in the area around the positive battery 
terminal. If there is an open breather opening in this area, it must be closed off with a 
sealing plug. The breather hose must be connected to the open breather opening in the 
area of the negative terminal.
WARNING
A highly explosive mixture of gases is given off when the 12-volt vehicle battery is being 
charged.
•12-volt vehicle batteries should only be charged in well-ventilated spaces.
•Never charge a 12-volt vehicle battery that is frozen or that has thawed. Discharged 12-
volt vehicle batteries can already freeze at temperatures of around 0°C (+32°Fyf .
•The 12-volt vehicle battery must be replaced if it has ever been frozen.
•Incorrectly connected cables can cause a short circuit. First connect the positive cable 
and then the negative cable.
WARNING
•Never connect or disconnect 12-volt vehicle batteries if the ignition is switched on or 
the engine is running. Never use a 12-volt vehicle battery that does not correspond with 
the vehicle's specifications. This can damage the electrical system or electronic 
components, which can cause electrical faults.
•Never connect equipment that supplies electric power, such as solar panels or a 
battery charger, to the 12-volt socket or to the cigarette lighter to charge the 12-volt 
vehicle battery. This can damage the vehicle electrical system.
NOTICE