"Control" equipment of jae(ä)ger

have found a new part in meim car ...

at the rear lights (blinker, etc...) is a control device of the brand jaeger (hope to have written it right, shit short-term memory).

I assume this is for the AHK, right?
further, after I wanted to "clean up" back there to eliminate the wire, I found an absolute mess.
Unfortunately, the RLF also helps me net a lot further. Is there a reasonable wiring plan for the car?

after I will degrade the AHK anyway (is a fixed and looks sch*** out) I also want to remove the unnecessary wiring. but I am currently facing a seemingly insoluble surrender.