Roc Control Unit; Airbag Systems - BMW 3-series convertible Complete Vehicle Workbook

ROC Control Unit

In the E93 Convertible, advanced crash and safety management is
equipped with an additional ROC control unit (rollover controller).
The ROC control unit is connected via a K-bus to the crash safety
module.
The task of the ROC control unit is to activate the actuators of the
rollover protection system in the event of an imminent rollover
situation.
Rollover detection takes place in the crash safety module. Two
telegrams are sent to the ROC control unit when the threshold
values are reached.
The ROC control unit (1) is mounted on the carrier structure of the
rollover protection systems behind the rear right seat.
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E93 Complete Vehicle Workbook

Airbag Systems

In addition to the known two-stage driver's and passenger's airbag,
newly designed side airbags are used in the E93. The side airbags
are integrated in the backrest of the SGS seat. The side airbags
have a larger volume compared to the airbags previously used.
The side airbag develops between the seat and door in the event
of side impact of sufficient severity. Due to the increased volume,
the occupant's thorax and head are additionally protected.
Design features of the E93 Convertible include the pronounced
inclination of the windshield with the windshield cowl panel extend-
ing further towards the rear. Knee airbags are additionally
fitted to conform to US legal requirements for protecting occupants
not wearing seat belts.
The knee airbags substantially reduce displacement of the pelvis
and initiate upper body rotation earlier in the event of an accident,
thus preventing occupant contact with the sun visor on the
windshield cowl panel. When the ACSM2 detects that the front
passenger seat is not occupied, the knee airbag on the passen-
ger's side will not be triggered in the event of a crash.