2004 BMW 745LiFACTORY OEM SERVICE PROCEDURE

Sensor System

The vehicle center satellite only records sensor data; it has no triggering functions. One acceleration sensor for the longitudinal acceleration forces and one for the transversal acceleration forces are integrated in the SFZ. The sensors provide a variable voltage. This voltage is a measurement of the vehicle acceleration. This information is provided to the SIM and the other satellites for evaluation of crash thresholds.

Fig 1: Sensor System Circuit Diagram
G03391538Courtesy of BMW OF NORTH AMERICA, INC.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • 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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