Today just WOW thank you soooo much B1MCP!!!!!!
He sends me a modul for testing it!

For all it was the BCM, after puting another BMC in the car, it starts and runs.
I'm so unbelievably happy i cant tell you!

Now i have to search for the reason why the car still thinks it is locked and just turns lights on when i try to unlock it with the remote...

Any ideas for tests if the security modul is also freaky?

And thanks you guys!!!!
Best regards from Munich
Maxi

That's great news that the car is running.

I'm not sure how to go about testing the security/locking module. There isn't very much information available about it - for obvious reasons I suppose.

The constant light on the dash is some kind of fault - there is no normal state that shows a constant light. When the system is armed then the light should be in a permanent flashing state.

I would say the balance of probability is that the security module got fried at the same time as the BPM. But I don't know how to prove that other than replacing the module.

Necroposting but, this ended up being my problem too. BPM, the first one I bought was bad and he second was good and a BB model and the car lives now, mine is an X306 XJR, posting here for the Google Search Engine to catch other people having this issue.