Volkswagen Golf GTI 2016, Owner'S Manual

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when the belt is pulled out fast, during hard braking and in a
collision. The belt may also lock when you drive up or down a steep
hill or through a sharp curve.
Safety belt pretensioner
The safety belt retractors for the driver and front seat passenger
have a pretensioner that helps take the slack out of the safety belt
and tighten it when the pretensioner is activated.
The pretensioners are activated by the electronic control unit for the
airbag system in front, side, and rear collisions. By tightening the
safety belt, the pretensioner helps to reduce the occupant's forward
movement. The belt pretensioner works together with the airbag
system; its function is monitored by the airbag system indicator
light. The belt pretensioner will not deploy in a rollover if the side
airbags are not activated.
A fine dust may be released upon activation. This is normal and is
not caused by a fire in the vehicle.
Safety belt load limiter
The front and rear outboard safety belts also have load limiters to