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Which sensor triggers restraint deployment?

  • A.A pressure switch in the bumper, which closes on impact and therefore fires the airbag without any delay
  • B.The wheel speed sensor
  • C.Accelerometers in the control unit supplemented by satellite sensors in the doors and the front structure
  • D.An accelerometer within the restraint control unit

Answer: D

A central accelerometer plus satellite sensors decide whether the impact warrants deployment. The last option describes exactly that arrangement, which makes it a correct and more detailed version. Pressure sensors genuinely are used for side impact. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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