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Emergency TENSIONING Retractor (ETR) In Seat Belt

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2000 BMW Z3, 2000 BMW 328i, 2000 BMW 323i, 1999 BMW Z3, and 1999 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

Emergency Tensioning Retractor (ETR) in seat belt assembly contains a gas generator pellet. When air bags deploy, SRS control unit ignites gas generator pellet and forces a piston downward in tube attached to seat belt assembly. Piston has a cable attached to it which pulls on seat belt reel. This increases seat belt tension and holds front seat occupant(s) tightly against seat backrest, increasing seat belt effectiveness. Not all vehicles are equipped with this system.

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