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E93 Complete Vehicle Workbook
If the hardtop movement is interrupted, the hardtop remains in the hold position. The pressure in the hydraulic system is maintained at all
times and is not shut off. In case of an emergency actuation of the hardtop, the bleed screw on the hydraulic pump must be released. The
hydraulic fluid does not need to be changed (lifetime filling).
If the hydraulic fluid needs to be refilled due to leaks ensure that the approved hydraulic fluid is used (see Electronic Parts Catalog).
Add hydraulic fluid only up to the mark on the reservoir. If a lot of noise is heard while the hardtop is actuated, the hardtop must be
opened and closed a few times in succession to allow the system to bleed.
The hydraulic system is automatically bled in the reservoir.
Closure Cylinders
The closure cylinders (1) lock the rear roof panel and rear module to the body. Before the hardtop can be opened, the rear roof shell must
be unlocked. It is unlocked by extending the piston. A Hall sensor is installed on the right cylinder that detects the position of the extend-
ed piston. Since the cylinders are de-pressurized if the hydraulic pump is not activated, they are engaged while locked or activated via
dead center.
The locking is signalled to the CTM by two microswitches ( one on each of the two closure cylinders). When the hardtop is closed, after
the roof package is extended and the rear module is closed, the closure cylinders are retracted in order to push the rear module all the way
into the lower position. Then, the closures open and are not closed until the roof shells are interlocked and locked to the cowl panel. The
rear roof panel and the rear module are locked to the body by closing the closures.
Index Explanation
1
Closure cylinder
2
Lock hook
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