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Home >> BMW >> 2012 >> 335xi Automatic Trans >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Restraint System - Functional Description - E92 >> Restraints Systems - Functional Description >> Seat-Position Sensor >> Functional description
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Functional description

The seat-position sensor is designed as a hall effect sensor. The current intensity changes depending on the distance of the seat position sensor to the magnet holder.

Using this measurement current, the airbag control unit detects the seat adjustment in the longitudinal direction.

Fig 1: Identifying Seat-Position Sensor Components
G09871992Courtesy of BMW OF NORTH AMERICA, INC.
Index Explanation
1 Driver's seat (shown: left hand drive vehicle)
2 Magnetic retainer
3 two-pin plug connection
4 Housing of the seat-position sensor
5 Sensor electronics