Z3 Convertible top - seems to be a common problem

In general, without any testing or diagnosis, you could be dealing with any of the following:

* Open relay - Located at the pump unit
* Close relay - Located at the pump unit
* End position micro-switch
* The operating switch itself
* An issue with the pump unit, but I doubt this, due to the intermittent nature. However, do check the hydraulic fluid level.

The windows do not have to be down for the system to run.

The brake pedal must be pressed while operating the switch. There is a switch at the pedal that signals the convertible top system, but if your brake lights are functioning, the brake switch will not be at fault.

The system is pretty simple and some quick electrical tests should locate the faulty item.

The Bentley repair manual for the Z3 has all of the electrical wiring diagrams, for use in the diagnostics. You can purchase this at Bavarian Autosport 800-535-2002.

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