Seat belts25
Safety First
Operating Instructions
Practical Tips
Technical Specifications
Belt tensioners*Function of the seat belt tensioner
During a frontal collision, the seat belts on the front seats are 
retracted automatically.The seat belts for the front occupants are equipped with belt tensioners. 
Sensors will trigger the belt tensioners during severe head-on, lateral and 
rear collisions only if the seat belt is being worn. This retracts and tightens the 
seat belts, reducing the forward motion of the occupants.
The seat belt tensioner can be triggered only once.
The belt tensioners will not be triggered in the event of light frontal and side 
collisions, if the vehicle overturns, or in situations where no large forces act 
on the front, side or rear of the vehicle.
Note
•If the seat belt tensioners are triggered, a fine dust is produced. This is 
normal and it is not an indication of fire in the vehicle.•The relevant safety requirements must be observed when the vehicle or 
components of the system are scrapped. Specialised workshops are familiar 
with these regulations, which are also available to you.Service and disposal of belt tensionersThe belt tensioners are components of the seat belts that are installed in the 
seats of your vehicle. If you work on the belt tensioners or remove and install 
parts of the system when performing other repair work, the seat belt may be 
damaged. The consequence may be that, in the event of an accident, the belt 
tensioners function incorrectly or not at all. So that the effectiveness of the seat belt tensioner is not reduced and that 
removed parts do not cause any injuries or environmental pollution, regula-
tions, which are known to the specialised workshops, must be observed.
WARNING
•Improper use or repairs not carried out by qualified mechanics increase 
the risk of severe or fatal injuries. The belt tensioners may fail to trigger or 
may trigger in the wrong circumstances.•Never attempt to repair, adjust, remove or install parts of the belt 
tensioners or seat belts.•The seat belt tensioner, seat belt and automatic retractor cannot be 
repaired.•Any work on the belt tensioners and seat belts, including the removal 
and refitting of system parts in conjunction with other repair work, must be 
performed by a specialised workshop only.•The belt tensioners will only provide protection for one accident and 
must be changed if they have been activated.
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