Hi, My convertible top of my 2005 Z4 is not working, start to open and stop. What wrong may be and what need to do ? How to open manually if motor not working ? If need repair what cost usually for tis problem?

If it goes down, the motor and pump works. Your most likely looking at the control module or a sensor. Have the codes read for the top module.

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Thread: 04 Z4 Won't Start - Roadfly Car Forum & Off Topic Forum ...

forum.roadfly.com > ... > BMW Z4 Roadster & M Roadster (E85)

Mar 5, 2008 - 20 posts - ‎6 authors
I could not start my Z this morning after not driving it for the past 4 days because of the weather. All lights come on the dash including the head lights but it won't crank. ... If the starter is not cranking because of the battery being too drained .... BMW Z4 2.5i started slow and finally would make a clicking noise.

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try a spray lubricant into the motor mechanism and grease any visable wire cables that run from/to motor ,not the electrical cables the bare wire winder cables,also grease/ lubricate any accessable pivot/hinge points , gently pull the cord and gently push the roof back and forth occasionally trying motor with a bit of patience this should get the roof moving , also look for anything that may be snagging the roof/mechanism as there is a pressure protection system to stop the roof being fully closed on say someones hand so preventing injury

The direct answer is there is a z shaped tool that comes in the tool kit in your trunk. This is a hex ended key that will fit in the motor. Access the motor is also in your user Guide. In the center of roof near the rear view mirror is an access panel to motor area. pry lose the panel and access motor. Place wrench in motor and wind away. There should be a direct arrow noting the direction of rotation. Note this will take sever thousand rotations of the wrench, it is a slow process but works.

i hate to say it but it looks like your going to have to get a new motor sorry for the bad news

I have a same problem. need help

If its yellow, thats a good thing. Check in the trunk that the two knobs that hold the top when retracted are in the down position. Top should drop like it always has. LOVE MY Z4!

I have this same vehicle and have had some problems with my top as well. Apparently, it is pretty common as I was recently talking to a shop owner with the same model and I were comparing notes. First thing to check is that the two "nobs" in the trunk are not rotated. The two nobs I am referring to are located on the top of the trunk when opened and when moved, either drop or lower the compartment into which the convertible top drops into when lowered. If these nobs are not turned so that the compartment is available, the top will not work. I have always wondered why they even installed those, but I was told it was so that we could have that extra 3" of storage space if absolutely needed. If the nobs are in the right position and your top is still not working, you can manually drop or bring up the top by turning the red handle (also located in the trunk near the convertible top storage) so that it is no longer flush, but turned so that you can see the 'O' shape. This has been my only option when my top started acting up in the middle of a Florida thunderstorm. Fantastic timing these things have. I hope this was helpful. If you are like most others who own the z4, or any bmw (or even a vw), you know that the mechanics (engine, etc.) are great in the fact that they rarely, if ever, cause any issues, but silly things like the stupid cup holders (don't get me started) and eventually bigger, but still aesthetic, items liek the top are the first to go. Would still never trade the z4 for a sedan.

get a dealer to look at it. The mechanism is fairly complex and the motor is very expensive. I you bust either the frame or the motor it'll really cost to fix. It may be freed up at much lesser cost.
Hate to tell you to get other help but thats my best advice.