The locking pawls on the rollbar press the toothed rack back
mechanically as the bar extends. When the protection bar is
extended, the locking pawls are supported on the tooth strip.
When the car is in the overturned position, the force is transmitted
via the locking pawls on the rollbars to the toothed rack.
The rollover protection system may be triggered as follows:
• Automatically when an imminent rollover situation is detected
• By a defined crash severity in a front-end, side-on or rear-end
crash
• Via the diagnostic interface
• By a mechanical emergency release mechanism.
In order to return the triggered rollbar back into its initial position, it
is necessary to press the toothed strap back so that the bar can be
pushed in.
Triggering the RPS
via Diagnosis
To check the function of the rollover protection system, it is neces-
sary to trigger the system using diagnostic equipment.
The output stages of the actuators are activated here with the aid
of a test module.
Note: It is absolutely essential to observe the following
safety precautions:
• Open the hardtop otherwise the rear window will
be damaged
• Make sure no-one is situated in the immediate
vicinity of the rollbars.
Mechanical Emergency Release
The rollover protection system should be triggered if it has to be
removed for repair work. If this cannot be done electrically, e.g. for
repair work following an accident, the system must be triggered
mechanically in order to avoid the risk of injury.
Follow the procedure set out below:
• Open the hardtop otherwise the rear window will be damaged
• Remove rear seat
• Remove partition panel
• Remove control units under the rollbar cassette
• Remove control unit carrier
• Use a hook (3 mm diameter) to reach the actuator
• The actuator has an opening in the middle, by means of
which the rollbar can be triggered using the hook.
E93 Complete Vehicle Workbook
47
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