Diagnosis

Diagnosis
The diagnostic functions of the Soft-top module IV are to a large degree identical with those on the E46. However, fewer signals are analyzed on the (E85) Z4 than on the E46 because there are fewer components on the (E85) Z4.

Soft-top module 4 internal check
The internal functions of the Soft-top module 4 are checked under the following circumstances:
^ When the power is switched on
^ When terminal R is ON
^ Before the soft-top is raised/lowered
If a system fault is detected, movement of the soft-top is stopped immediately. The fault detected is recorded in the fault memory of the Soft-top module
4. If the nature of the fault allows, the soft-top can be moved to the nearest safe parked position using one of the soft-top control buttons.

Control button for raising soft-top
A short circuit on the control button for raising the soft-top would raise the soft-top. The soft-top can still be moved to a safe parked position using the functioning control button for lowering the soft-top.

Control button for lowering soft-top
A short circuit on the control button for lowering the soft-top would lower the soft-top. To prevent the soft-top lowering, the functioning control button for raising the soft-top can be used to move the soft-top to a safe parked position.

Electric locking system
The electric locking system is fitted with an overload protection circuit. The overload protection circuit has a time-out function as well as the hardware systems. In the event of misuse, e.g. while the soft-top is in motion, the time-out function disables the fully automatic soft-top function. After a certain time (when time-out has elapsed) the fully automatic soft-top function is restored.