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Home >> BMW >> 2001 >> M3 2D Convertible >> Repair and Diagnosis >> Restraints >> Restraints Control Systems >> Passive Safety Systems - Technical Training (E46) >> Passive Safety Systems >> Roll Over Protection System >> Components of the System: >> Roll Over Bar Cassettes
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Roll Over Bar Cassettes

The roll over cassettes are new and constructed completely from aluminum with a pad integrated in the top of the bar. The cassettes are bolted into the reinforced carrier behind the seat back. When retracted, they are covered by the rear head rest which incorporate a flap, at the back, that will open when the roll bars deploy.

Fig 1: View Of Roll Over Bar Cassettes
G03395884Courtesy of BMW OF NORTH AMERICA, INC.

A new resetting procedure is incorporated to retract the bar after deployment. The reset is constructed in the roll bar cassette and the separate tool has been eliminated.

Fig 2: Identifying Reset Lever
G03395885Courtesy of BMW OF NORTH AMERICA, INC.

Pulling the reset lever forward will release the ratchet assembly so that the roll bar can be pushed down and locked into the solenoids.

Fig 3: Pulling Reset Lever Forward
G03395886Courtesy of BMW OF NORTH AMERICA, INC.


A newly designed solenoid, mounted in the bottom of the cassette, holds the bars in the retracted position until triggered by the roll over sensor for deployment.

Fig 1: View Of Roll Over Bar Solenoid
G03395887Courtesy of BMW OF NORTH AMERICA, INC.