3 Series E90 320i (N46) SAL
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If a fault is detected in an MRS circuit, only the affected circuit is deactivated. The other airbags and belt
tensioners remain operational.
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If there is a fault in the airbag warning lamp circuit, the lamp does not light up during the self-test. If there is
no other fault, the MRS remains fully operational.
If there is an internal fault in the MRS control unit or in the power supply, the entire system is deactivated. (The
airbag and seat-belt indicator lamps light up, visual display in the LCD)
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Seat belt indicator lamp
The seat belt indicator lamp is the visual seat belt warning. The visual seat belt warning instructs the occupants
of the vehicle to fasten their seat belts. Terminal 15 ON activates the visual seat belt warning.
The visual seat belt warning is issued as follows:
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Seat-belt indicator lamp in the instrument cluster (required by law)
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Check-Control message in the LCD
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Deactivating front-passenger airbag and side airbag on front-passenger side (not in US version)
If Option 470 "ISOFIX mounting for child seat" (front) has been installed, the airbags can be deactivated via the
switch for passenger airbag deactivation (as on the E85).
In switch position OFF, the following airbags on the front-passenger side will not be triggered: front-passenger
airbag and side airbag.
The indicator lamp for front-passenger airbag deactivation (front-passenger airbag OFF lamp) lights up.
The switch is located on the right-hand edge of the dashboard. The switch is accessible when the front-
passenger door is open. The switch is operated using the key integrated into the remote control.
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Indicator lamp for passenger airbag deactivation (US version; option 470 ISOFIX mounting for child seat)
If the warning lamp for passenger-airbag deactivation (passenger airbag off lamp) is lit, the following airbags on
the passenger side have been deactivated: front-passenger airbag and side airbag.
The "Passenger Airbag OFF" lamp is constantly monitored by the MRS control unit. A fault in the power supply
or a defective lamp is stored in the MRS control unit's fault memory. If this occurs, the airbag warning lamp is
switched on.
The "Passenger Airbag OFF" lamp is in the roof function centre.
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Shutting off the fuel pump
Depending on accident severity, the fuel supply may also be cut off.
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TCU: Telematics control unit
The emergency call is transmitted via the TCU. The TCU is connected to the MRS control unit by the
instrumentation bus (I-bus).
Mechanical components in the multiple restraint system (MRS):
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Belt force limiters on seat belts
The seat belts are the primary restraint system for all occupants. Each of the 5 seats is fitted with a three-point
safety belt.
To minimise the load on the chest area of the rear passengers in the event of a severe head-on collision, the
front seat belts are fitted with belt force limiters as standard. The belt force limiters ensure that the belt strap can
unroll if the load exceeds a certain level. The risk of injury due to the belt force acting on the body is therefore
reduced.
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Passive knee protection (US version only)
Not every state in the USA has a legal requirement for seat belts to be worn. Therefore, US versions have
additional impact protection in the knee area of the driver and front passenger.
In the event of an impact, this knee protection provides a flat support for the knee if the front passengers are not
wearing their seat belt. This causes the forwards movement of the upper body to be controlled towards the
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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