2003 BMW 745LiFACTORY OEM SERVICE PROCEDURE

Front Belt Tension Limiter: Notes

The belt tension limiters for the driver and passenger seat are inertia reel seatbelts with adaptive force limitation.

A gas generator is used to switch from a high degree of force to a lower degree of force. This also has to be possible during an accident to achieve a regressive force reduction. The advantage of the adaptive belt tension limiter is the considerable reduction of the load on the chest in the event of a crash.

With optimum coordination to the airbag, the kinetic energy of the occupant is reduced evenly across the duration of the crash, thus achieving low occupant load values.

Fig 1: Identifying Pyrotechnic Connector
G03391552Courtesy of BMW OF NORTH AMERICA, INC.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
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  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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