ABS II failure I believe you've never seen this

are you sure you do not have a short circuit somewhere in the loom close by ?

The twisting is of the ABS unit making the wires connect somehow
 
Looks like a missing ground somewhere on the ABS unit...

The owner changed the battery and brought the bike to a BMW shop to have it reinitialised. He went back home, didn't use it for 2 days, and the third day when trying to start it, the ABS began to whin permanently.

 
Issue solved.

Hours of work before discovering a bad ground there:




Just have to deal now with the upper ABS light flashing.

Battery is new but low, will see tomorrow.
 


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