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Home >> BMW >> 2012 >> 335i 2D Convertible, Automatic Trans >> Repair and Diagnosis >> General Information >> OEM General Information >> Functional Description - F30 >> Restraint System - Functional Description >> Crash-active head restraint >> System functions >> Impact detection
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Impact detection

The direction and severity of an impact is detected by the acceleration sensors in the crash safety module or MRS control unit and by external acceleration sensors. The crash safety module or MRS control unit process all the acceleration data.