1 Series E87 118d (M47T2) 5-door
sensors are arranged at 90 degrees to each other.
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Airbag sensor on left-hand B-pillar and right-hand B-pillar
Each of the airbag sensors on the B-pillars contains a lateral-acceleration sensor and a longitudinal-acceleration
sensor. The sensors are arranged at 90 degrees to each other.
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Airbag front sensors (US version only)
The 2 front airbag sensors are longitudinal acceleration sensors.
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Front left door airbag sensor and front right door airbag sensor (US version only)
The 2 airbag sensors are pressure sensors.
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The following components provide input signals for the multiple restraint system (MRS):
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Seat-belt buckle switch for driver's seat and front-passenger seat
The seat-belt buckle switches provide information whether or not the seat is occupied.
The seat-belt buckle switches are receive power from the MRS control unit.
The power consumption of the switch forms the signal for the switch position (seat belt engaged or not
engaged).
The signal from the seat-belt buckle switch decides whether or not the seat belt tensioner is actuated when it is
needed (only in the event of a frontal/rear-end collision).
The seat belt-lock switches on the driver and front passenger seats are permanently monitored when terminal R
is ON.
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 fastened.
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Passenger-seat occupancy detector
The passenger seat-occupancy detector recognises whether the seat is occupied or not. When it is loaded with
a weight of more than approx. 12 kg, the resistance of the seat occupancy mat changes. The signal is sent to
the MRS control unit via a direct line.
If the front passenger seat is recognised as being occupied without the seat belt buckle switch sending a signal,
a fasten belt warning will be emitted.
Whether or not the belt tensioner on the front passenger side is activated depends on the status signal of the
seat belt buckle switch (seat belt fastened or not fastened). If the seat belt has been inserted into the seat-belt
buckle switch, the belt tensioner is also activated.
If the multiple restraint system (MRS) triggers the airbags and the front-passenger seat is unoccupied, the front-
passenger airbag and the side airbag on the front-passenger side will not be triggered. The head airbag is
triggered.
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E87 from 09/2005
If the multiple restraint system (MRS) triggers the airbags, the front-passenger airbag and the side airbag
on the front-passenger side will be triggered even if the front-passenger seat is unoccupied.
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Passenger seat occupancy detector (US version)
In accordance with the stipulations of the National Highway Traffic Safety Administration (NHTSA) a small child
in a child restraint system on the front-passenger seat must be automatically detected. Upon detection, the
airbags on the passenger side are automatically deactivated (front-passenger airbag and side airbag). The
indicator lamp for front-passenger airbag deactivation lights up.
The seat-occupancy detector is based on an evaluation of the surface pressure generated when the seat is
loaded.
SBT Multiple restraint system 5 E87, E90, E91, E92
BMW AG - TIS
18.01.2013 18:49
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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