Technical information

On models in the 6-Series (E64), the rollover sensor is located in one of the satellites.
The rollover protection bars are retracted in the structure during normal operation. The rollover protection bars are pre-
tensioned in the direction of extension by a spring and held by the lock on the actuator.
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BMW 3-Series E93 and MINI Convertible R57
If the control electronics of the rollover protection controller detect an imminent rollover, the two actuators are triggered
directly. The rollover protection bars are extended by spring force and mechanically locked in their end position.
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BMW 6-Series E64
If the rollover sensor in the satellite detects an imminent rollover, the data is transmitted via a light-linked bus system to
the safety and gateway module (SGM). At the same time, the signal to release the rollover protection system is sent via a
copper cable (arming cable) to the SGM. This triggers the two actuators via an output stage. The rollover protection bars
are extended by spring force.
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Function of the 3-Series E36 and E46
Triggered rollover protection system in the 3-Series E46 (A) and E36 (B) Convertible
On models in the 3-Series (E36), the rollover protection system comprises two rollover protection bars behind the head
restraints of the rear seat (visible), and on models in the 3-Series(E46) of two rollover protection bars in the head
restraints of the rear seat (installed concealed).
The rollover protection system is a separate system and is not linked to the airbag control unit.
The rollover sensor is screw-mounted directly to the protective cover behind the seat bench on the right.
The rollover sensor consists of:
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A level sensor for identification of vehicle inclination, latitudinal and longitudinal acceleration.
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An acceleration sensor for detection of loss of road contact.
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Evaluation electronics with self-diagnosis.
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Two capacitors to provide the reserve energy needed to trigger the rollover protection bars should the vehicle
voltage fail.
When the limit values are reached, the integrated rollover sensor issues a command to the actuator to enable the locks.
A solenoid operates the lock and releases the spring-loaded rollover protection bar. The rollover protection bars are
extended and mechanically locked in their end position.
Active engine compartment lid
In the event of a collision with a pedestrian, the engine compartment lid is raised. This creates a deformation zone that
protects the pedestrian.
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Function
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