Detecting a Crash

2009 BMW Z4 30i, StandardSECTION Detecting a Crash

The Crash Safety Module uses the values transmitted by the sensors to determine the direction and severity of the crash.

The threshold values of two independent sensors must be detected in order to detect a crash. In the case of a front-end crash, for example, the acceleration values from the B- B-Pillar satellite and from the longitudinal acceleration sensor must be detected in the Crash Safety Module.

Based on the crash severity and direction, an algorithm determines the triggering (firing) points and the order of the restraint systems to be activated.

RENDER: 1.0x

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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.