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The control module has set a fault and it will have to be reset. They are sensitive to voltage & must have 12 volts to operate properly. The windows and top will need to be resync. I cannot find any information regarding the diagnostic procedure for the roof ..
it states there is a procedure to diagnose the fault with the number of flashes
the switch makes .. a dealer may be your best option on this fault .. I hope this helps some.
How about "soft-top covering" 54318412054 in black. Go to realoem.com and click :Enter" Put in the info for your car (I guessed). Find the section that has the part you want, "Folding Top Mounting Parts" for example. http://www.realoem.com/bmw/showparts.do?model=CH33&mospid=48094&btnr=54_0194&hg=54&fg=10
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.
i had the same problem and BMW told me it will cost 1200 AUD to fix. I fixed it for free. inside there is a tiny kill switch above the passanger side. it wont let the roof operate unless you lift the roof. that was the problem. it was faulty. I by passed it and it has been fine for 5 years. I can't find the switch to replace so when I watch and lift the roof like you normaly do when want to open it.
Do not top off tank when fueling. Had this problem and realized that it occured when I topped up after the pump shut off. No problem since. Feel that when topping up, you overfill the tank and fuel gets in the vent line and charcoal filter which somehow affects the fuel gauge. I have a 99 Z3 coupe.
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