3 Series E90 320i (N46) SAL
relevant airbag (driver or passenger airbag).
System functions
The following system functions of the multiple restraint system (MRS) are described:
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Triggering the multiple restraint system
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Visual and audible seat belt warning
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Emergency call (EURO version)
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Emergency call (US version)
Triggering the multiple restraint system
Extensive testing has allowed the triggering thresholds to be determined for all possible types of accidents.
The following triggering thresholds were set for activating the different restraint systems:
•
Seat belt tensioners
•
Front airbags
•
Side airbags
•
Head airbags
•
Safety battery terminal
•
Electric fuel pump
The following examples illustrate how the various restraint systems are triggered:
•
Head-on collision
The belt tensioner and the front airbags are activated if frontal impact is sufficient to exceed the triggering
thresholds in the MRS control unit.
The belt tensioners have a lower triggering threshold than the front airbags. This means that depending on
accident severity, only the belt tensioner may be activated by the MRS control unit.
If the seat-belt buckle switch is faulty, the MRS control unit will attempt to activate the belt tensioner in spite
of the error message.
If the seat-occupancy detector is faulty, the control unit assumes that the passenger seat is occupied. The
restraint systems are activated. Depending on accident severity, the safety battery terminal is activated and
the electric fuel pump switched off.
•
Side impact
If the triggering threshold in the MRS control unit is exceeded, the side airbag and the head airbag on the
side affected by the impact are activated.
Depending on accident severity, the safety battery terminal is activated and the electric fuel pump switched
off.
•
Front diagonal impact
The airbags and belt tensioners are triggered depending on the rate of vehicle deceleration in a longitudinal
or lateral direction.
If several triggering thresholds are exceeded, the corresponding restraint systems will be triggered for
frontal collision and/or side impact (front airbag, side airbag, head airbag). Depending on accident severity,
the safety battery terminal is activated and the electric fuel pump switched off.
•
Rear-end collision
The belt tensioners are activated if rear impact is sufficient to exceed the triggering threshold in the MRS
SBT Multiple restraint system 5 E87, E90, E91, E92
BMW AG - TIS
26.01.2013 20:00
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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