24
Complete Vehicle
To change the direction of movement of the folding soft-top, the direction of rotation of the
hydraulic pump motor is reversed. The hydraulic pump only operates while the soft-top is
being moved.
The operation of the pump and locking mechanism are controlled by the CVM IV control
unit as required on the basis of the soft-top switch setting.
A temperature sensor protects the hydraulic pump unit against overload. There is a tem-
perature sensor fitted to the hydraulic pump unit (similar to E46/C). At a temperature of 105º
Celsius the pump is prevented from operating in order to protect the hydraulic system from
damage. The soft-top can then only be operated manually.
There is no facility for topping up the hydraulic fluid on this sealed hydraulic system, nor is
it necessary. The hydraulic system has a self-bleeding function which is activated by repeat-
ed operation. In order to replace the hydraulic pump unit, the soft-top frame has to be
removed.
Hydraulic servo units
The folding soft-top is moved in two directions for lowering and raising by two double-
action hydraulic servo units. The hydraulic servo units can only be replaced in conjunction
with the soft-top frame as a whole.
There is one hydraulic servo unit on each side of the soft-top frame (in the main pillar) on
the main bearings. The hydraulic pump unit is attached to the left hydraulic servo
unit.
Preconditions for raising and lowering the soft-top
Before the soft-top can be moved, the following preconditions must be met:
1. Neither window detected as closed by the basic module
2. Vehicle stationary (road speed < 5 km/h)
3. No hardtop fitted
4. Ignition key position at terminal R at least (except for Easy Open/Close function)
5. System test reports no faults
6. No short circuit and no circuit break present
7. Outside temperature is above minimum limit
Preconditions 1 to 7 must be satisfied simultaneously.
Lowering the soft top
(46 Seiten)
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