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  #1  
Old 07-01-2018, 07:26 PM
GrumpyOldCodger GrumpyOldCodger is offline
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Mein Auto: 2004 BMW X5 3.0i
convertible top won't go down

I have a 2003 BMW Z4, and just had this problem happen recently. I've checked the forums and am sure it isn't the shelf adjustment, this problem is slightly different. When I press the down switch inside the car, the red light does not come on, and the windows don't roll down the 1-2 inches in preparation for the top lowering. The up button behaves the same way, no red light. There are 3 fuses involved in the soft top operation, checked all of those and they are good.
It's been a dry summer, the car was only out in the rain once this year and the top worked fine several times afterwards. The car is always garaged.
From reading and youtube posts, the motor usually goes at some point as the drainage in the motor compartment is not the best.
If anyone can think of anything else to try, I would greatly appreciate it.
A lot of the other posts with the microprocessor switch needing to be replaced indicate that the down/up light inside is orange. Mine has always been red, and now it doesn't light up at all.
Thanks, and safe driving.
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  #2  
Old 07-31-2018, 07:23 PM
FloridaZ4 FloridaZ4 is offline
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Mein Auto: Z4 3.0 si
I assume the two knobs in the trunk are in the lower position. They allow the trunk space to be expanded (upper position) and won't allow the top to open.
This is the first thing I checked when my top failed recently. However I have a bad hydraulic unit (third time)
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Old 07-31-2018, 08:07 PM
FloridaZ4 FloridaZ4 is offline
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Mein Auto: Z4 3.0 si
The hydraulic unit seems to be a known problem:
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