X Series E83 X3 3.0i (N52K) OFFRD
The following sensors detect the direction and severity of an impact:
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Airbag front sensors
The airbag front sensors are longitudinal acceleration sensors. The front airbag sensors detect a head-on
collision.
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Front left door satellite and front right door satellite
There is a pressure sensor in each satellite door. The pressure sensors detect a side impact.
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Left-hand B-pillar satellite and right-hand B-pillar satellite
The B-pillar satellites each contain a lateral acceleration sensor and a longitudinal acceleration sensor. The
sensors are arranged at 90 degrees to each other.
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Acceleration sensors in the MRS control unit
There is a lateral acceleration sensor and a longitudinal acceleration sensor in the MRS control unit. The
sensors are arranged at 90 degrees to each other.
The following components provide input signals for the multiple restraint system (MRS):
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Seat-belt-lock switch (driver and passenger seat)
The seat-belt-lock switch indicates whether the seat belt is engaged or not.
The seat-belt-lock switch is powered by the MRS control unit. The power consumption of the switch forms the
signal for the switch position (seat belt engaged or not engaged).
The seat-belt-lock switches on the driver and passenger seats are permanently monitored when terminal R is
ON. For example, if a seat belt is released while the vehicle is in motion, there is a seat-belt warning.
A seat-belt warning is started when terminal 15 is ON.
The seat-belt warning indicates to the occupants that they should fasten their seat belts.
The seat-belt warning is an extension of the previous time-dependent display (seat-belt warning lamp in the
instrument cluster for approximately 6 seconds after terminal 15 is switched ON).
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Seat-belt-lock switch (US version)
When terminal 15 is ON, a seat-belt warning lamp lights up and a warning sounds if the driver and passenger
seat belts are not engaged. Once the driver and passenger seat belts are engaged in the corresponding
buckles, the seat-belt warning lamp and the audible warning are switched off.
If a seat belt is released while the vehicle is in motion, the seat-belt warning lamp lights up and a warning signal
sounds for approximately 90 seconds.
The MRS control unit uses the signal from the seat-belt-lock switch to determine whether an airbag should be
triggered at stage 1 (seat belt not engaged) or at stage 2 (seat belt engaged).
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Passenger seat occupancy detector
The passenger seat-occupancy detector recognises whether the seat is occupied or not. When a weight is
placed on the seat, resistance in the seat-occupancy mat changes.
If the multiple restraint system (MRS) triggers the driver's airbag, the passenger airbag and belt tensioner will not
be triggered if the passenger seat is unoccupied.
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Passenger seat-occupancy detector (US version)
Due to legal requirements in the USA, a child seat securing a one-year-old child which is placed on the
passenger seat must be automatically detected. Upon detection, the airbags on the passenger side are
automatically deactivated (passenger airbag and front right-hand side airbag).
SBT Multiple restraint system 4 E83
BMW AG - TIS
19.02.2013 04:59
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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