X Series E83 X3 3.0d (M57TU) OFFRD
stage gas generator. The airbags are triggered at different levels depending on the severity of the accident.
Side airbags
The side airbags reduce the risk of injury to the occupants in the event of a side collision. The side airbags
are located behind the door trim panel. The side airbags are always triggered at stage 1.
Head airbags
The head airbags protect the occupants' head in the event of an impact to the side body panels. They also
protect the head from objects that may enter the vehicle.
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Belt tensioners
The pyrotechnic belt tensioners pull the front seat belts tight against the occupants' body in the event of a
head-on or rear-end collision.
In a normal situation, the seat belt does not sit completely tight against the body. The seat belt always has a
small degree of play to guarantee the occupants an adequate degree of comfort. The play of a fastened
seat belt is know as slack. The prevent the negative effects of this slack, the seat belt buckle is pulled down
several centimetres by gas generators in the event of an accident. This pulls the seat belt tight.
Safety battery terminal
Depending on the severity of the accident, the safety battery terminal disconnects the starter motor and the
alternator from the power circuit. This minimises the risk of short circuits in a serious accident. The trigger
signal comes from the MRS control unit.
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Airbag warning lamp
The airbag warning lamp shows the operational capability of the multiple restraint system (MRS). The airbag
warning lamp is located in the instrument cluster and is controlled by the MRS control unit (via the K bus).
After the ignition is switched on, the MRS performs a self test. While this is being run, the airbag warning lamp
lights up (approximately 3 to 5 seconds). When the system is ready, the airbag warning lamp goes out.
If, during the self test or while the vehicle is in motion, the MRS control unit detects an existing fault or one that
has been stored, the airbag warning lamp remains on.
If the MRS detects a fault, the operational capability is partially maintained, if possible, subject to the following:
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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.
•
If there is a fault in the airbag warning lamp circuit, the lamp does not light up. 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.
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Deactivation of the passenger airbag and the front right-hand side airbag
The passenger airbag and the front right-hand side airbag are deactivated by a coding procedure.
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Warning lamp for passenger-airbag deactivation (US version)
If the warning lamp for passenger-airbag deactivation (passenger airbag off lamp) is lit, both airbags on the
passenger side have been deactivated: the passenger airbag and the front right-hand 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 located in the control panel in the overhead console.
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Shutting off the fuel pump
When an airbag is triggered, the fuel feed is also shut off.
SBT Multiple restraint system 4 E83
BMW AG - TIS
16.02.2013 01:24
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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