5.After the height adjustment is completed, pull the seat belt firmly and check that the adjuster is securely locked. Seat belt pre-tightening force limiting function ●The seat belt with pre-tightening function can only be used once. A new seat belt must be replaced after the pretensioner is detonated. When the pre-tightening force-limiting device is triggered, white smoke may be emitted. This is a normal phenomenon. It does not mean that the car has a fire, so don't worry. ●The seat belt pretensioner will become very hot after the detonation, so do not touch the relevant parts within a few minutes after the pretensioner is detonated.
Caution Warning Some modelsЎЇ seat belts are equipped with pretightening force limiting devices, which aimed to ensure that the seat belt fastens the passenger's while crash. When the severity of the crash accident reaches a certain level, the pre-tightening force limiting device may be activated, and the retractor tightens the seat belt in the rewinding direction to slow the passenger's forward motion. If the tightening force exceeds a certain limit, the force limiting device will release the seat belt and reduce the force acting on the body. When the pre-tightening force-limiting device is triggered, white smoke may be emitted. This is a normal phenomenon.
It does not mean that the car has a fire, so don't worry. ●The driver is forbidden to adjust the seat belt height while driving. 9 https://www.allcarpdfmanuals.com