I need some help with my el. Rear roller

Hi, everybody, I've got an el. Rear blind made of a 93 V8.
Thanks again to Thomas Bux. Because of the schematic. I did the wiring as described in the circuit diagram. The measuring of the cable resulted in 12.4V on terminal 30 and the same value on the connected pin as soon as I press the button.
The problem I have is that despite the current the rear blind does not go out. I have found that the connection to the control unit for the engine has no voltage in any case. Neither with pressed button nor without.
This certainly indicates a defective ECU, doesn't it? ==References====External links== Repair? I've already opened it but can't detect any causal damage.

As a second test, I supplied the engine with 12V from a model train transformer and the Rollo only runs out to the half and then "starved". Is the ECU providing a higher voltage?
I didn't find anything about the search that would help me.
When driving out lightly, neither a rattling (defected gear) is heard, nor are the temples bent.

Who can help me with some information??

Thank you Henning