It will close and lock using the motor.
Manually open z4 roof.
Hi the softtop roof on my 2006 z4 unlatches from the screen and the main motor runs for 2 seconds and the roof stops open 2 5cm or an inch.
This is a hex ended key that will fit in the motor.
Here is a video showing how to manually operate the convertible top on a bmw z4 for instance if the hydraulic pump failed.
This is called the bowden cable whatever that means.
The direct answer is there is a z shaped tool that comes in the tool kit in your trunk.
Access the motor is also in your user guide.
It also shows how to operate the hydraulic release latch in the trunk.
Pry lose the panel and access motor.
The first motor drives the top lock latch mechanism which locks and unlocks the roof to the windscreen.
If i use the manual crank and wind the front top motor back 4 turns a i would to close it manually and then press close roof button.
Manual opening a z4 convertible top.