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.
SOURCE: Hi, My convertible top of my 2005 Z4 is not
I'm sorry to say that it sounds like your motor on the hood has packed up, this is usually due to water ingress and is not easy to repair. There are some drain holes in the area of the motor and these tend to clog with dirt etc this results in the motor getting wet and results in the problem you have explained I have had the same problem with my Z4 and this was fixed by BMW as apparently they have to re-align the roof although there are several forums with people who have done it themselves and report it take about 5 hours There is a manual release in the boot that will allow you to move the roof up and down. If you open the boot and look along the top edge you will see a red tab. Pull this out 5mm and twist so it doesn
SOURCE: z4 roadster 2002 convertible top will not open
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.
SOURCE: convertible top won't open
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'm sorry to say that it sounds like your motor on the hood has packed up, this is usually due to water ingress and is not easy to repair. There are some drain holes in the area of the motor and these tend to clog with dirt etc this results in the motor getting wet and results in the problem you have explained I have had the same problem with my Z4 and this was fixed by BMW as apparently they have to re-align the roof although there are several forums with people who have done it themselves and report it take about 5 hours
There is a manual release in the boot that will allow you to move the roof up and down. If you open the boot and look along the top edge you will see a red tab. Pull this out 5mm and twist so it doesn
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